A Journey Through Time: Tracing the History of Renewable Energy in the United States
The tale of renewable energy in the United States is a long and winding one, marked by periods of innovation, decline, and resurgence.
Let’s take a trip down memory lane to explore this dynamic story:
Early Beginnings (Before 1800s):
- Wood Power: For millennia, wood remained the primary source of energy for heating, cooking, and lighting. Its abundance and ease of access made it the go-to fuel for early Americans.
- Water Power: Harnessing the power of flowing water for grinding grain and powering small mills started appearing as early as the 17th century.
The Rise of Hydropower (1800s – Early 1900s):
- Industrial Revolution: The 19th century saw a surge in industrialization, demanding greater energy needs. Hydropower emerged as a powerful solution, with the first commercial hydroelectric plant opening in Appleton, Wisconsin, in 1882.
- Dam Construction Boom: Large-scale dam projects like Hoover Dam in the 1930s further cemented hydropower’s dominance as the leading renewable energy source.
Shifting Landscapes (Early 1900s – Mid 20th Century):
- Fossil Fuel Era: Discovery of vast oil and natural gas reserves, coupled with technological advancements, led to a shift towards these cheaper and readily available fossil fuels. Renewable energy gradually receded into the background.
- Wood’s Resurgence: World War I and II, with their constraints on fossil fuels, saw a temporary return to wood as a heating source.
Environmental Awakening (Mid 20th Century – Present):
- Renewed Interest: Growing concerns about environmental damage and limited fossil fuel resources sparked a renewed interest in renewable energy sources in the 1970s.
- Policy Push: The oil crisis of the 1970s further propelled policy changes encouraging renewable energy development. The Carter administration invested in solar and wind research, laying the groundwork for future advancements.
- Tech Advancements: Technological innovations, particularly in solar panels and wind turbines, drastically reduced their costs, making them more competitive with fossil fuels.
- Continued Growth: Today, renewable energy sources like solar, wind, and geothermal are witnessing significant growth, driven by supportive policies, falling costs, and public demand for clean energy.
Key Milestones:
- 1978: The Public Utility Regulatory Policies Act (PURPA) encourages renewable energy development by requiring utilities to buy surplus electricity from small producers.
- 1992: The Energy Policy Act of 1992 incentivizes renewable energy projects with tax credits and grants.
- 2005: The Renewable Portfolio Standards (RPS) require states to increase their reliance on renewable energy sources.
- 2011: Renewable energy surpasses nuclear power for the first time in the United States.
- 2022: The Inflation Reduction Act provides substantial funding for renewable energy development, transmission, and storage.
Looking Ahead:
The future of renewable energy in the United States is bright. With continued investment, technological advancements, and supportive policies, renewable sources are poised to play an increasingly crucial role in meeting the nation’s energy needs while creating a cleaner and more sustainable future.
Renewable Energy Consumption in the United States
Here’s a breakdown of renewable energy consumption in the US, incorporating insights from recent data and addressing potential confusion:
Overall:
- In 2022, renewable energy accounted for 13.18 quadrillion British thermal units (Btu) of total energy consumption, or 13% of the national energy use.
- This figure includes renewable sources like hydropower, wind, solar, geothermal, biomass, and biofuels.
- Notably, hydropower makes up the largest share of renewable consumption, contributing approximately 37% of the total.
- However, solar and wind are experiencing the fastest growth, with their combined contribution reaching 33% in 2022.
Consumption vs. Production:
- It’s crucial to differentiate between consumption and production. While 13% represents consumption, renewable energy production in the US reached 13.40 quads, or 13% of total production, in 2022.
Specific Sources:
Here’s a breakdown of specific renewable energy sources’ consumption based on 2022 data:
- Hydropower: 4.90 quads (37%)
- Biomass: 3.02 quads (23%)
- Wind: 1.62 quads (12%)
- Solar: 1.43 quads (11%)
- Biofuels: 1.34 quads (10%)
- Geothermal: 0.87 quads (7%)
Growth and Future Outlook:
- Renewable energy consumption has been steadily increasing in the US, with a significant jump from 9.9% in 2021 to 13% in 2022.
- Factors like the Inflation Reduction Act of 2022 and continued technological advancements are expected to accelerate this growth in the coming years.
- Experts predict that renewable energy consumption could reach 28% of total energy use by 2050.
Breakdown Data of Renewable Energy in the United States
Production (2022):
| Source | Energy Production (Trillion Btu) | Percentage of Total Renewable Production |
|---|---|---|
| Hydropower | 8.13 | 61.3% |
| Wind | 13.30 | 29.8% |
| Solar | 3.99 | 7.5% |
| Biomass | 2.00 | 1.4% |
| Geothermal | 0.01 | 0.0% |
| Total Renewables | 17.43 | 13.4% |
Consumption (2022):
| Source | Energy Consumption (Trillion Btu) | Percentage of Total Renewable Consumption |
|---|---|---|
| Hydropower | 7.85 | 58.5% |
| Wind | 5.92 | 43.9% |
| Solar | 1.29 | 9.6% |
| Biomass (Biofuels & Electricity) | 4.42 | 32.8% |
| Geothermal | 0.03 | 0.2% |
| Total Renewables | 19.51 | 15.0% |
Additional Breakdown:
- Wind: Texas, Oklahoma, and Iowa are the top three states for wind energy production.
- Solar: California, Texas, and Florida are the top three states for solar energy production.
- Biomass: Biofuels (mainly for transportation) account for roughly half of biomass consumption, while the other half comes from biomass electricity generation.
- Hydropower: The majority of hydropower production comes from large dams, especially in the West and Pacific Northwest.
Sources:
- U.S. Energy Information Administration (EIA): https://www.eia.gov/tools/faqs/faq.php?id=92&t=4
- EIA Monthly Energy Review: https://www.eia.gov/mer/
Hydropower Statistics in the United States
Production:
- 2022: Hydropower accounted for 6.2% of total U.S. utility-scale electricity generation and 28.7% of total utility-scale renewable electricity generation.
- Energy generation:
- 262 billion kilowatthours (kWh) in 2022 (13.4% of renewable production, 61.3% of hydro production)
- Highest recorded annual generation was in 2011 (812 billion kWh)
- Capacity:
- 102 gigawatts (GW) as of 2022, primarily from large dams.
- Largest facility: Grand Coulee Dam (Washington) with 6,765 MW capacity.
Consumption:
- 2022: Consumed 7.85 trillion Btu (equivalent to 230 TWh).
- Source:
- Conventional Hydropower: 99.8%
- Pumped Storage Hydropower: 0.2%
Distribution:
- Top 5 Hydropower-Producing States:
- Washington
- California
- Oregon
- Tennessee
- Alabama
- Regional Breakdown:
- West: 62% of national capacity
- Southeast: 22%
- Northeast: 9%
- Midwest: 7%
Environmental Impact:
- Positive: Clean energy source, low greenhouse gas emissions.
- Negative: Dams can harm ecosystems and fisheries, displace communities.
Additional Notes:
- Hydropower development has slowed down in recent years due to environmental concerns and competition from other renewable sources.
- Pumped storage hydropower plays a critical role in grid management by storing and releasing energy when needed.
- The future of hydropower in the US is uncertain, but it is likely to remain an important source of clean energy.
Wind Energy Statistics in the United States
Here’s a summary of some key statistics on wind energy in the US, as of 2023/early 2024:
Generation:
- Electricity: In 2022, wind power generated 434.8 terawatt hours of electricity, making it the main source of renewable energy in the US, surpassing hydropower. (Source: Statista)
- Growth: Since 2000, wind electricity generation has increased significantly, from 6 billion kWh to 380 billion kWh in 2021. In 2022, it accounted for 10.2% of total US utility-scale electricity generation. (Source: EIA)
Capacity and Infrastructure:
- Installed capacity: As of 2023, the US has a total wind power capacity of 146 gigawatts (GW), enough to power 46 million American homes. This makes it the fourth-largest source of electricity generation capacity in the country. (Source: Clean Power Alliance)
- Turbines: Over 70,000 wind turbines are currently operating across all 50 states. (Source: Clean Power Alliance)
Economic Impact:
- Jobs: In 2020, the wind industry supported over 120,000 jobs in the US. (Source: Clean Power Alliance)
- Investments: Renewable energy investments, including wind, rose to $105 billion in 2021, a 7% increase from the previous year. (Source: Statista)
- Environmental benefits: Wind energy avoided 336 million metric tons of CO2 emissions in 2022. (Source: Clean Power Alliance)
Solar Energy Statistics in the United States
Here’s a summary of some key statistics on solar energy in the US, as of 2023/early 2024:
Generation:
- Electricity: In 2022, solar power generated 145.6 terawatt hours of electricity, representing 3.4% of the total and 15.9% of renewable energy production. (Source: Statista, EcoWatch)
- Growth: Solar electricity generation has seen rapid growth, experiencing an average annual increase of 24% in the last decade. (Source: Statista)
Capacity and Infrastructure:
- Installed capacity: As of 2022, the US has a total solar power capacity of 110 gigawatts (GW), enough to power 37 million American homes. (Source: Statista)
- Systems: Over 3 million solar photovoltaic (PV) systems are installed across the US, with residential installations growing at a record pace in 2022. (Source: SEIA)
Economic Impact:
- Jobs: The solar industry employed over 346,000 workers in 2022, and the workforce grew by 3.7% from the previous year. (Source: EcoWatch)
- Investments: Private investments in the solar industry reached $36 billion in 2022. (Source: SEIA)
- Environmental benefits: Solar energy avoided 84 million metric tons of CO2 emissions in 2022. (Source: SEIA)
Biomass Energy Statistics in the United States
Here’s some key data on biomass energy in the US as of February 19, 2024:
Overall Contribution:
- Share of total energy consumption: 5% in 2022 (4,930 trillion British thermal units, TBtu)
- Largest source before mid-1800s.
Sources of Biomass Energy:
- Biofuels (49%):
- Ethanol production: 15.4 billion gallons in 2022
- Biodiesel/renewable diesel production: 3.1 billion gallons in 2022
- Wood and wood waste (43%):
- Net electricity generation: 39.9 gigawatt hours in 2019 (3rd largest non-hydroelectric renewable source)
- Densified biomass fuel production capacity: 12.96 million tons per year (as of November 2023)
- Waste energy (8%)
Geothermal Energy Statistics in the United States
Here’s some key data on geothermal energy in the US as of February 19, 2024:
Overall Contribution:
- Share of total electricity generation: 0.4% in 2022 (17 billion kilowatthours)
- Ranked 5th among renewable energy sources in the US.
Capacity and Production:
- Installed geothermal capacity: 2,653 megawatts (MW) as of 2022, leading the world.
- Geothermal electricity generation: 214 trillion British thermal units (Btu) of renewable energy consumed in 2022.
- California: holds the top spot with 2,792 MW installed capacity, followed by Nevada with 805 MW.
Additional Notes:
- Geothermal energy also finds applications beyond electricity generation, including direct heating for buildings, greenhouses, and industrial processes.
- Despite its potential, geothermal energy faces challenges like upfront costs, limited geographical suitability, and permitting hurdles.
Top 10 Largest Renewable Energy Infrastructures in the United States by Capacity
Here’s a table summarizing the Largest Renewable Energy Infrastructures in the United States by Capacity
| Rank | Infrastructure Name | Type | Capacity (Gigawatts) | State(s) | Owner(s) |
|---|---|---|---|---|---|
| 1 | Grand Coulee Dam Hydroelectric Project | Hydroelectric | 7.26 | Washington | U.S. Bureau of Reclamation |
| 2 | Hoover Dam Hydroelectric Project | Hydroelectric | 2.08 | Arizona & Nevada | U.S. Bureau of Reclamation |
| 3 | Antelope Solar Project | Solar | 3.5 GW (DC) | California | NextEra Energy |
| 4 | Alta Wind Farms | Wind | 1.3 GW | California | PacifiCorp & Berkshire Hathaway Energy |
| 5 | Fowler Ridge Wind Farm | Wind | 1.26 GW | Indiana | EDP Renewables |
| 6 | Sapphire Wind Farm | Wind | 1.22 GW | Wyoming | PacifiCorp & Berkshire Hathaway Energy |
| 7 | Coronation Solar Project | Solar | 1.2 GW (AC) | New Mexico | Enel Green Power |
| 8 | Desert Sunlight Solar Farm | Solar | 550 MW (AC) | California | First Solar |
| 9 | Diamond Generating Station (Unit 3) | Natural Gas with Carbon Capture & Storage | 0.53 GW (net) | Oklahoma | NET Power & Fluor Corporation |
| 10 | Topaz Solar Farm | Solar | 550 MW (AC) | California | SunPower & Google |
Notes:
- This list includes both operational and under-construction projects.
- Capacity is measured in either gigawatts (GW) or megawatts (MW). DC (direct current) and AC (alternating current) capacities are specified where relevant.
- “Natural Gas with Carbon Capture & Storage” is still technically considered a fossil fuel source, but included here due to its potential for reducing greenhouse gas emissions.
Top 10 Largest Renewable Energy Companies in the United States
The renewable energy sector in the United States is rapidly growing, with many companies playing a significant role in the transition to clean energy.
Here are 10 of the largest renewable energy companies in the US, along with some of their notable projects:
1. NextEra Energy:
- Market Cap: $186.4 billion
- Focus: Wind and solar energy
- Notable projects:
- Wind: Grady County Wind Farm (Texas, 815 MW), Summit Ridge Wind Farm (Iowa, 540 MW)
- Solar: Manatee Solar Energy Center (Florida, 700 MW), Voyager Solar Project (California, 500 MW)
2. Brookfield Renewable Partners:
- Market Cap: $70.6 billion
- Focus: Hydropower, wind, solar, and battery storage
- Notable projects:
- Hydropower: Grand River Hydro Facility (Michigan, 1,000 MW)
- Wind: Jericho Wind Farm (Texas, 213 MW), Shannon Ridge Wind Farm (Iowa, 175 MW)
- Solar: Maricopa Solar Project (California, 400 MW)
3. Ørsted:
- Market Cap: $49.8 billion
- Focus: Offshore wind energy
- Notable projects:
- Offshore wind: Block Island Wind Farm (Rhode Island, 30 MW), Hornsea Project 2 (UK, 1.386 GW)
4. Duke Energy:
- Market Cap: $69.8 billion
- Focus: Diversified energy company with significant renewable energy investments
- Notable projects:
- Solar: Hamilton Solar PV Facility (North Carolina, 80 MW), Buckeye Solar Facility (Arizona, 100 MW)
- Wind: Atlantic Coast Offshore Wind Farm (North Carolina, 2.5 GW)
5. Dominion Energy:
- Market Cap: $60.4 billion
- Focus: Diversified energy company with significant renewable energy investments
- Notable projects:
- Solar: Coastal Virginia Solar Project (Virginia, 170 MW), Mount Sterling Solar Facility (Kentucky, 130 MW)
- Offshore wind: Coastal Virginia Offshore Wind (Virginia, 2.6 GW)
6. Constellation Energy:
- Market Cap: $22.4 billion
- Focus: Regulated utility with investments in renewable energy generation
- Notable projects:
- Solar: Beryl Solar Project (Utah, 200 MW)
- Wind: Wild Horse Solar Facility (Nevada, 500 MW)
7. EDP Renewables North America:
- Market Cap: N/A (subsidiary of EDP Renewables)
- Focus: Wind and solar energy
- Notable projects:
- Wind: Fowler Ridge Wind Farm (Indiana, 600 MW)
- Solar: Agua Caliente Solar Project (Arizona, 290 MW)
8. Invenergy:
- Market Cap: N/A (private company)
- Focus: Wind and solar energy
- Notable projects:
- Wind: Capricorn Ridge Wind Farm (Texas, 460 MW)
- Solar: Mojave Solar Project (California, 500 MW)
9. Apex Clean Energy:
- Market Cap: N/A (private company)
- Focus: Wind and solar energy
- Notable projects:
- Wind: Atlantic Sunrise Wind Farm (Virginia, 600 MW)
- Solar: Blue Mountain Solar Farm (Utah, 130 MW)
10. Avangrid Renewables:
- Market Cap: N/A (subsidiary of Avangrid)
- Focus: Wind and solar energy
- Notable projects:
- Wind: Weaver Wind Project (Wyoming, 243 MW)
- Solar: Castle Solar Project (California, 267 MW)
This list is not exhaustive, and there are many other important renewable energy companies in the United States. However, it provides a good overview of some of the leading players in the industry and their current projects.
Latest Renewable Energy Tech in the US: A Data-Driven Look
The US renewable energy landscape is buzzing with advancements across various sources and storage solutions. Here’s a data-driven snapshot of some key developments:
Solar:
- Perovskite solar cells: Boasting cheaper production and exceeding 25% efficiency (compared to traditional silicon’s 20%), these next-gen cells could revolutionize the industry.
- Building-integrated photovoltaics (BIPV): This aesthetically pleasing tech integrates solar panels directly into buildings, reducing costs and offering seamless integration.
Wind:
- Offshore wind: Vast untapped resources are propelling large-scale projects, offering stronger and more consistent wind energy.
- Floating wind turbines: Expanding possibilities by allowing deployment in deeper waters, particularly along the West Coast.
Energy storage:
- Long-duration storage: Technologies like flow batteries and compressed air are crucial for integrating renewables into the grid, offering days or even weeks of storage capacity.
- Battery advancements: Continuously decreasing costs and emerging chemistries like lithium-sulfur batteries promise even higher energy storage potential.
Other technologies:
- Geothermal energy: New methods for extracting energy from lower-temperature resources aim to unlock more of this clean and reliable source.
- Hydrogen: Produced from renewables, hydrogen offers storage, electricity generation, and vehicle fuel potential, but cost and infrastructure hurdles remain.
Data highlights:
- In 2022, annual US renewable energy generation surpassed coal for the first time.
- Domestic solar energy is expected to rise by 75% and wind by 11% by 2025.
- The Energy Department invests heavily in driving down the cost of solar energy in America.
These are just a few examples of the dynamic renewable energy landscape in the US. As costs continue to fall and technologies further mature, we can expect even more exciting breakthroughs in the future, paving the way for a cleaner and more sustainable energy future.
Future of Renewable Energy Development in United States
The future of renewable energy development in the United States appears bright, driven by several key factors:
Growing Demand:
- Public and corporate demand for clean energy is surging, fueled by climate change concerns and economic benefits.
- Net-zero targets set by governments and corporations further accelerate the shift towards renewables.
Technological Advancements:
- Continued cost reductions in solar, wind, and other renewables make them increasingly competitive with fossil fuels.
- Innovations in areas like grid integration, energy storage, and emerging technologies like geothermal and hydrogen unlock new possibilities.
Policy and Investment:
- The Biden administration’s ambitious goals and infrastructure investments prioritize renewable energy development.
- States are enacting clean energy mandates and providing incentives, creating a supportive policy environment.
- Continued private sector investment fuels innovation and project development.
Challenges and Opportunities:
- Transmission grid upgrades are crucial to connect renewable energy sources to demand centers.
- Permitting processes and community concerns require streamlining and transparent solutions.
- Ensuring a just transition for workers in the fossil fuel industry is vital for social acceptance.
Potential Future Trajectory:
- Experts predict continued exponential growth in renewable energy capacity, potentially reaching 80% of the US electricity mix by 2050.
- Decentralized renewables like rooftop solar and community microgrids could play a significant role.
- Hybrid energy systems combining renewables with other sources like natural gas may be utilized for grid stability.
- The US has the potential to become a global leader in clean energy technology and export innovation.
Here are some additional data points to consider:
- In 2023, renewable energy accounted for 22% of US electricity generation, with solar and wind leading the way.
- The Energy Information Administration projects renewables to be the fastest-growing source of electricity generation in the coming decades.
- The renewable energy sector already employs millions of Americans, and these numbers are expected to grow significantly.
The future of renewable energy development in the US is promising, with potential for significant economic and environmental benefits. However, overcoming challenges and maximizing opportunities will require continued policy support, technological advancements, and community engagement.
https://www.exaputra.com/2024/02/united-states-renewable-energy-landscape.html
Renewable Energy
Pardalote Studies Australian Blade Erosion and Heat Fatigue
Pardalote Studies Australian Blade Erosion and Heat Fatigue
Rosemary Barnes, CEO and founder of Pardalote Consulting, joins to discuss their new grant-funded study of blade erosion and heat fatigue in Australia.
Sign up now for Uptime Tech News, our weekly newsletter on all things wind technology. This episode is sponsored by Weather Guard Lightning Tech. Learn more about Weather Guard’s StrikeTape Wind Turbine LPS retrofit. Follow the show on YouTube, Linkedin and visit Weather Guard on the web. And subscribe to Rosemary’s “Engineering with Rosie” YouTube channel here. Have a question we can answer on the show? Email us!
Welcome to Uptime Spotlight, shining light on wind energy’s brightest innovators. This is the progress powering tomorrow
Allen Hall 2025: Well, Rosemary, welcome back to the show.
Rosemary Barnes: Thanks, Allen. Great to be here. For, it’s been a while since we did one of these one-on-one episodes, like a, yeah, a proper, proper guest.
Allen Hall 2025: Well, this is kind of a celebratory episode because your company, Pardalote Consulting, has been awarded, uh, some funding from the Australian Capital Territory’s government for the Energy Innovation Fund.
Rosemary Barnes: It’s a really good program that the ACT government has to try and get energy innovation In the state. It’s not a state actually, it’s technically a territory. Little more than just Canberra, the city. Uh, but there are actually quite a few, like, really interesting energy-related companies here, partly ’cause of the, the fund I think helps, but also just tracing back like, [00:01:00] uh, y- you know, in the 20-teens, Australia had a really conservative government that hated renewable energy, and the ACT government had a commitment at that time to 100%, um, 100% renewable electricity for the, the government.
And that was one of the only programs that was resulting in a lot of, um, you know, clean energy projects being built, and one of the conditions that they put on that, uh, for people that would win PPAs with the ACT was that you had to have your headquarters in Canberra. So we’ve actually got quite a few, quite a few really cool, innovative companies out of here.
Um, like Neoen’s headquarters here. Windlab, uh, yeah, was, was founded here and still has a lot of people here. Pardalote obviously, and you know, a few other companies as well. So despite it being a small city of like, I don’t know, maybe it’s up to 400,000 or something people by now, um, yeah, there is actually quite a lot going on here for energy.
Allen Hall 2025: And the Energy Innovation Fund is funded by the wind and solar operators in the area, and your particular [00:02:00] effort has really global consequences. You’re focusing on two areas involving how wind turbines survive Australia, but more, uh, of relevance is to just really tough conditions which exist not just in Australia but around the world.
What two areas are you going to focus on?
Rosemary Barnes: Yeah. So the two focus areas are leading edge erosion and high temperature fatigue, which we can probably get into the definitions of those in a minute. But basically my, um– what led me to wanna have a project like this was that when I moved back to Australia in 2021, I– and I started working in O&M, uh, I noticed that the wind turbines that I would look at, the blades that I would look at here behaved really differently to the ones that I worked with overseas.
You know, es- especially with leading edge erosion, like often I would be doing a condition assessment of a, you know, a new wind farm. Um, might only have been operating for, you know, two years. That’s a pretty common time for people to get in and do a condition assessment [00:03:00] because their warranty period is about to end and they wanna, you know, make sure that everything is okay.
Um, and I would just notice that often, like 90, 100% of blades would already have bad erosion after just a couple of years, which is super-duper fast. And then there are some tools available to check, um, like what kind of erosion are you likely to experience on your site. Like is it a higher severity erosion site or a, a low severity one?
Um, and you basically, you know, the status quo globally is to just look at the annual rainfall, um, and the tip speed. And if you’ve got, you know, high for both of those, that’s a bad erosion site. And if you’ve got low for both of those, it’s a, a low erosion site. But when I plotted out the wind farms that I knew had really bad erosion problems onto, you know, a chart with those two axes, I just saw a random distribution of dots.
You know? Like, this was not– uh, this had no predictive value for Australian wind farms. And so that led me to believe that, okay, um, you know, things are a bit [00:04:00] different here. Makes sense, you know, most of the knowledge that we have about how wind turbines operate, it’s been developed and validated mostly in Northern Europe.
You know? Like it’s, it’s Denmark and the surrounding countries that had, like, the bulk of the early wind energy. First few decades of knowledge were, you know, were mostly there. Of course, there were some other, um, places that had wind turbines, but, you know, most of the The OEMs have been operating for decades, came from Denmark.
And I know when I lived in Denmark, the rain there is very different to the rain in Australia. So in Denmark, it’s basically always raining, right? Like, it’s just… Like, even if it’s not raining, you’re still gonna get wet when you go outside ’cause it’s just, like, the air has this just amazing ability to just hold onto moisture.
Um, but it’s very, very gentle. But, you know, over an entire year of most days having gentle rain, that adds up to a lot. Whereas in Australia, and especially if you go, like, north to Queensland, it rarely rains. It’s mostly just dry, and when it [00:05:00] does rain, it’s like a tap turns on, and I, I swear you will get bruised from the rain droplets hitting your skin.
You know, they just have so much energy in them. So I think that that i- you know, when you look at just the overall rainfall, you really hide something important about how erosion, um, can progress. Then, um, there’s other places in Australia that have very different characteristics. Again, they don’t have that kind of really intense rain but, you know, some of those sites are also having really bad erosion.
And so it just occurred to me, I did a lot of research, you know, into what’s going on and, you know, the academics are studying erosion a whole lot, and they’ve got, you know, a lot of standardized tests and, you know, products are developed according to these standardized tests. But the standardized tests don’t actually resemble reality, and especially they don’t resemble reality in Australia.
And so my client started asking me, “Okay, you know, the products that we have are, are terrible. We have to replace them every couple of years. It’s, um, causing big problems with also [00:06:00] the amount of energy that you’re losing.” One of the types of, um, leading-edge erosion or leading-edge problems that we have in Australia is that the, the coatings tend to peel off and make these, like, big flakes which will just massively disrupt the airflow, can cause y- you know, at least a few percent AEP loss, and maybe up to five.
And even worse than the AEP loss is the revenue loss because it affects it most at, you know, lower wind speeds. Um, you get a bigger hit than at rated wind speeds. So there’s a variety of problems going on with leading edges in Australia, which mean that I, I basically… My clients would ask, “What product should we put on to prevent having to, you know, constantly replace this?”
‘Cause it costs, like- you know, 30, $40,000 per turbine to replace the protection, not to mention, you know, one or two days of downtime. It’s expensive, and I basically, I didn’t have a good answer for them. What, what product should they put on? I don’t know. No, we, we don’t know. One, we don’t know what the [00:07:00] specific, um, characteristics are that are…
what the specific local environment, local conditions are that are accelerating leading-edge erosion, one. And two, all of the products tend to be tested around this, you know, there’s this protocol that academics have come up with, and they’ve kind of like assumed that this is representative of how things behave in the field, and it’s– I don’t think it’s particularly true anyway, but it’s especially not true in Australia.
There are a few companies that are testing to different standards. Um, definitely applaud them. But without knowing wha- what are the conditions truly like in Australia, uh, it’s really hard to advise, like, what kind of tests should you be demanding from a product you’re considering to be sure that you’re gonna put it on and not gonna be replacing it again in two years.
Allen Hall 2025: Because that’s really the trouble in Australia is when you get offered products They have been tested generally in somewhere in Europe and maybe in the United States, and then when they go to [00:08:00] Australia, it’s really unknown as to how those products will do, which is a huge risk for the Australian wind market as to what to choose, how to choose, is it– what’s real in terms of test data.
So now you’re gonna go out and do what? Are you gonna put sensors out by the wind farms? Are you gonna try to do more of a statistical summary of the actual environment around wind farms using existing data? What’s the approach here?
Rosemary Barnes: It’s all of the above, but the part that is supported by the grant is that we’re gonna have enough money to be able to buy some scientific-grade sensors and put them on, um, a sample of Australian wind farms.
So we’re gonna be looking at a lot more characteristics about the rain than simply is it raining now, you know, how many millimeters per hour. We’re also gonna be investigating, you know, every kind of characteristic of, of that, um, of that rain, um, including, yeah, like the, the energy that’s in it, for example.
A, a bunch of stuff. I won’t get into every single [00:09:00] parameter. Um, and you know, other things as well, like measuring UV, solar radiation, um, particles, because, you know, in Australia we have a lot of dirt roads, which I know is very common in wind farms around the world, but Australian dirt roa- roads are always dry and dusty, like 99% of the time, so that’s one of the things that y- you know, maybe that’s causing a difference.
Um, so basically putting sensors all over a bunch of wind turbines and then monitoring the erosion, um, a combination of some real-time monitoring and also looking at inspection, um, drone inspection images annually. We also have a- an option where we’ll just be using SCADA data and inspection images, so that’s like a lower cost version where we can combine that with the findings from the scientific-grade instrumented turbines to build up a picture of what types of conditions lead to accelerated erosion.[00:10:00]
Allen Hall 2025: So the SCADA data will, will have some information inside of it, you think, that, uh, will correlate to the weather outside?
Rosemary Barnes: It has some Additionally, we can look up, um, you know, just the weather data, like how many millimeters fell during which 15-minute interval throughout the day, what was the temperature.
SCADA will tell us also what the temperature was, um, what the speed of the turbine was, so you can calculate the tip speed, ’cause that’s an important thing. Um, yeah, so it’s, it’s two, it’s two tiers of data collection. The scientific grade sensors, as you can imagine, are, are really expensive and y- you know, the, the grant project has contributed a, a lot of funding, um, but it’s not enough to put those, yeah, put a little mini lab on top of every turbine across Australia, obviously.
So that we’re using s- doing selectively, and then we can increase the number of wind farms that are included in the study by just doing this, um, cheaper version of the SCADA [00:11:00] plus, uh, weather data that’s available.
Allen Hall 2025: So what are some of the risks on the temperature side for all the high-temperature regions of Australia that have wind turbines?
Clearly it’s generally warmer in Australia than it is in, in Scandinavia and Northern Europe. What kind of temperatures are we talking about on the ground?
Rosemary Barnes: Uh, well, temperatures here can get pretty close to 50 degrees. Um, and if you’ve ever been inside a wind turbine blade on a, even a mildly hot day, you’ll know that the temperature inside a wind turbine, and especially inside the blade, is much hotter than what it is, uh, what the ambient temperature is.
So this project is one– I’ve actually been talking about this project for, yeah, like over 10 years now. Ever since I started, I moved to Denmark, started working for a wind turbine manufacturer, I had done– I had just finished doing my PhD on composite materials, structural design, and analysis. So, um, yeah, very, very familiar with, [00:12:00] you know, how composite materials work and, in particular, the effect that temperature has on them.
I mean, like most materials, when composites get warmer, they get softer, and that is really important for a w- a wind turbine blade. You know, if it gets, um, less stiff, then you’re gonna get a lot more strain, and that is going to affect your fatigue behavior. Y- you know, fatigue is just the application of a little bit of, a small amount of strain.
It’s not gonna cause damage, but when you apply it millions, tens of millions of times, like you do in a, o- over a wind turbine’s operate, um, operating lifetime, then that builds up. And, you know, wind turbine blades are a very fatigue-driven design. Um, it’s one of the most important things to consider when you’re designing a wind turbine blade.
And so when I got to Denmark and I learned how materials are qualified and how the qualification is treated in the certification process, I just realized it’s not particularly conservative, and also that some of the assumptions that are made that [00:13:00] wo- again, they worked really well in more moderate climates where wind turbines have had most of their developmental history.
You know, it’s not such a big deal there if you test at room temperature. Your wind turbine blade is spending most of its operating lifetime at room temperature or below. It’s, it’s rarely, you know, above 30 degrees in Denmark and most of Northern Europe and, you know, also a lot of, um, a lot of America, not, not all of it But, um, in Australia it has just extended periods above that temperature and even exceeding the temperature where, you know, wind turbines have an operating limit and after that they will shut down.
But the operating limits are based on ambient temperature. It’s not based on what’s the temperature in the laminate, which is what really matters for blade lifetime. So anyway, I’ve been obsessed, like honestly obsessed about this issue for 10 years. Talked about it with anybody who would listen . But then when I started working in O&M in [00:14:00] Australia and I started seeing some wind farms with an abnormal number of cracks early…
again, early in their lifetime, you know, I think one of the wind farms I was looking at was maybe three years old or four at the time. I think it was three actually, and had a lot of cracks, and I looked at a few years in a row and it was more and more cracks every year and I’m like, “Oof, this really looks like end of life fatigue behavior.”
A- actually it’s not, y- you know, there’s this concept of a bathtub curve where, um, when you’re looking at failures in components, in, in anything, not just in, um, wind turbine blades, but you know, like you’d start– it’s called a bathtub because, you know, when it starts operating, you’ll get quite a lot of failures.
Anything big, any manufacturing defects or anything are gonna cause failures quite fast, and that kind of drops off over time as all of those, uh, get addressed. And then you have, you know, the bulk of your operating life, it’s like pretty low level, pretty, pretty constant for a long time and then as you get towards the end of the [00:15:00] life, you start to see failure rates rise up again.
That’s your fatigue failures, your end of life fatigue failures. And so when I saw the same types of cracks more and more each year, I’m like, “This looks like, you know, the foot end of the bathtub, not the head end.” And, uh, it made me worried and I’ve now seen that across a few wind farms in Australia at, um, hotter places.
There’s a few blade types that are more prone to it than others, but at this point it’s still a suspicion that that’s what’s going on. I mean, a suspicion backed by a lot of, a lot of theory and knowledge of how the certification process works. But this project now we’ve got some funding to actually go put some sensors onto wind turbines, actually learn what the temperatures are in the blades throughout the whole laminate, um, not just the, you know, on the outside surface or not just the ambient temperature, but actually, you know, develop a temperature gradient across the whole, um, the whole laminate in the blade shell.
Um, and [00:16:00] then we’re going to be doing a bunch of modeling basically to look at what is the effect of these different temperatures that blades are really seeing and how much would we expect to… that to decrease a lifetime. And then we should also be able to say, you know, if you have this issue in your wind farm, you might be able to change your operation a little bit and extend your lifetime a lot.
Because this one, it’s real– like, in contrast to leading edge erosion, leading edge erosion is just, it’s, you know, every wind turbine has it to a certain extent, and it, it’s always there, but it’s a relatively minor cost to fix it. You know, like it sounds like a lot, like 30, $40,000 per wind turbine, but, um, you know, compared to if you’ve got to replace every blade across your fleet because they’re all, you know, at the end of their life after five years, you know, that’s obviously shocking.
And, you know, that’s a bad example, but even in a y- you know, like a less extreme example, maybe [00:17:00] after 15 years you have to do a, you know, a f- a fleet-wide campaign to strengthen blades or something. It’s, you know, m- many millions of dollars for that, and so it c- could make sense to be able to learn, okay, what, what hours of operation should we be avoiding?
Additionally, because when it’s super-duper hot in Australia, usually you’ve got heaps of solar power and the electricity price is not that high. So I, I think that there– and I don’t, obviously, before we’ve done the project, I don’t know what the threshold is. But in both cases, we will be aiming to improve the knowledge of how you can operate to avoid these periods of accelerated damage.
Allen Hall 2025: Do you think you’re seeing more fatigue-like damage due to the blades operating when it’s hot or not operating when it’s hot, with maybe less airflow around the blade and maybe less cooling going on is just a temperature soak At rest? [00:18:00]
Rosemary Barnes: Yeah. It’s interesting because the temperature is higher if it’s not rotating, um, because you get a whole lot of, um, convective heat, heat transfer when the turbine is operating.
So your temperatures are not gonna get as hot when operating as when they’re standing still. However, if it’s standing still, they’re only very lightly loaded. Like, yes, they’re gonna get, um, blown by, by gusts and, um, have a little bit of bending, but it’s, it’s very, very small compared to, uh, if it is y- you know, operational loads.
Uh, assuming that you’re not in the middle of a s- a storm. But yeah, a storm probably doesn’t come with 50 degrees temperatures.
Allen Hall 2025: And what part of the blade is susceptible to these higher temperatures? Is it the resin? Is it the fiberglass or carbon fiber? Or is it the, the glue, the bond joints? What part are you focused on?
Rosemary Barnes: The resin is the main part that I’m focused on. It gl- it could be an issue for glue too, actually. I haven’t even looked into what the, um, yeah, temperature assumptions are with, with glue, with [00:19:00] bond lines. But the failures that I’m seeing in the field are not, are not bond line issues. It’s, it’s, um, a laminate problem.
Allen Hall 2025: What about balsa and foam inside of the blade? Are they affected by the temperatures or are they pretty temperature stable?
Rosemary Barnes: I don’t think they’re affected at these kinds of temperatures, no. They, they don’t really do much actually. The, the core materials, like it, it is very important that they’re, that they’re there, but their job is really to keep the fiberglass separated from its- itself to make it stiffer.
So, um, yeah, that’s, that’s unlikely to be a, a major source of problems.
Allen Hall 2025: So this study is gonna work over about three years, and you have a number of wind farms that are participating. Are you looking for more wind farms to participate in Australia?
Rosemary Barnes: Yeah. Yeah, definitely. I mean, we can, um, have as many as, as people want to join.
We’ve got quite a good selection so far. Definitely can always welcome more. A, a bit limited in how many can get the really, um, good sensor [00:20:00]package, because the grant funding is a, you know, a certain amount, and that’s paying the bulk of those sensors. So, um, those spots are limited. So if anybody wants to really zone in on what is specifically causing erosion on their site, you know, if you know that you have got leading edge protection that is not good enough and you have to replace it soon, but you don’t know what to replace it with, then, you know, that would be the kind of wind farm that might want to consider, yeah, joining this and, um, you know, getting these sensors on their, um…
We’re putting them on top of the nacelles, most of them. Um, yeah, so that would be a good match then. Um, and then, yeah, for the ones that are doing the SCADA data and, um, weather data- There’s not such a, a hard limit on how many we can have join like that. So yeah, we can have more, more like that.
Allen Hall 2025: In the temperature fatigue effort, i- is that still looking for participants or are there particular wind turbine types or manufacturers that you’re [00:21:00] looking for to participate?
Rosemary Barnes: Yeah, I think, um, I, I mean yes, we can have more of those. That’s a simpler, a, a simpler issue as well. The sensors are not so expensive and, um, it’s, yeah, it’s a, it’s a simpler project to join that one. We only need, you know, a couple of turbines per site, so it won’t be such a, uh, an involved process to get everything up on into the turbines.
And in terms of who might like to join that, I would say anybody that is in a really hot area where, you know, where they see a lot of days over 30 degrees, and if they see any days, you know, getting into the high 40s, then I would say that that’s worthwhile. Or even I have seen this issue in some milder sites, um, yeah, depending on the, on the blade type as well.
It is more common with polyester resins. They have a, a lower op- uh, maximum operating temperature than epoxy resins. But then also just anybody that has noticed just, hey, [00:22:00] we’ve got a lot of cracks, and it seems like we’re getting more and more cracks every year, which to be honest, can be hard to keep track of if you’re…
If you’ve got a full service agreement, uh, you know, an OEM managing your wind farm The early signs of this are gonna be category one and category two cracks. They’re not in exactly the same location. It’s, you know, it’s a tricky one. Normally, if you’re looking at a serial issue, then you’re going to have, uh, well, you know, your ideal pattern for a serial issue is the exact same thing happening over and over again.
And so it is harder to pull this out. It also really would be very rare for it to be happening in the first two years or three years, whatever your serial defect liability period is. So it’s quite hard. But, um, another group of wind farms that might like to consider it is if you know that in, you know, a certain number of years you have to renegotiate your service agreement or, you know, it ends and you might have to take over yourself, then this’ll be a really good way for you to [00:23:00] understand, you know, have I got a ticking time bomb here?
Um, because it’s not something that you’re gonna be aware of if you haven’t been, you know, doing some really, really in-depth shadow, shadow monitoring of your blades, you know, running your own inspections and looking at every single damage, not just category three, four, five, but lower ones. So yeah, I mean, there’s a, a wide variety of people that, that could be interested in joining.
Allen Hall 2025: Are you expecting a number of manufacturers that make leading-edge protection or involved in resin creation, some– there’s a number of resin companies and a variety of resins that are used globally, sort of interchangeably at times. Are you expecting some of those companies to participate in this effort just to learn about the Australian environment?
Rosemary Barnes: I think it would be a good opportunity to test out some products and see how they behave in the Australian context. I think that that would be a really good selling point, but I, I have to say that most of the companies doing that sort of thing that wanna enter Australia, they don’t [00:24:00] really consider…
Like, from the perspective of wind farm owners in Australia, if you can’t show us wind farms in Australia where this has worked and, you know, show us a before or after, you know, the old LEP lasted Two years and our LEP is going on four years now with no damage. It, you know, unless you’ve got a before and after like that, you can tell us however many turbines that you’ve got installed around the world, but, um, we don’t consider it validated, y- you know?
It’s not validated for Australian conditions yet. And I do have this same discussion over and over again with, you know, not just leading edge protection, but all kinds of, um, you know, manufacturers of whatever doodads that you put on to improve a, a wind turbine. It’s so different to Australia. Things break so fast.
And I’m talking everything, you know, like vortex generators fall off and, um, yeah, like, uh, you know, bits of lightning protection systems fall off, seals just [00:25:00] crumble and disintegrate. Um, and it, you know, we’re very wary of, of new products. So I, I do– I mean, I’m thinking of it more from my client’s point of view than from the product manufacturer’s point of view.
But one thing that I wanna get out of this pro- project is to be able to answer one of the most common questions that I get is, which is, what leading edge protection should I be putting on my turbine? And for now, I don’t know. I, I know a range of products that don’t work in Australia, and not much more than that.
So, um, yeah. And it’s also, you know, Australia’s a very varied place with lots of different kinds of climate too. So it’s not gonna be like, you know, the product that works in Queensland is the same one that’s gonna work in Tasmania, which is the same one that’s gonna work in Western Australia. You know, um, so it, this project is gonna really pull out what are the site specific issues you’ve got at your site and what kinds of, um, you know, tests would we need to see a product um, perform in order to know that this [00:26:00] is gonna last on your site.
Allen Hall 2025: W- what is the outcome of this project or these two projects? Are they gonna be reports or, uh, a, a continual monitoring system that’s designed for the Australian environment? How do you see this going?
Rosemary Barnes: Yeah, so one part of it is, um, developing a way to identify periods of accelerated damage and to know not to operate during that time.
So we call it protective operation. Uh, so that would, uh, help you if, yeah, you’re trying to extend the life of something or increase the amount of time before you have to repair, then y- you know, that would be useful to have that knowledge. And it will be as simple as just an alert saying, “Hey, accelerated damage conditions.
Consider, you know, if you wanna keep on operating.” And, you know, if the price of electricity is super high at that time, they may want to push through, and if it’s low, they probably won’t want to. So that’s one thing. Um, especially, you know, as wind turbines get to their, near the end of their life. I’ve got some clients whose wind farms only have, you know, [00:27:00] maybe five years operation left.
They just simply don’t wanna repair their leading edge protection again. They just, they, they don’t wanna do that. So they would be happy to, you know, reduce operation a bit and have their turbine limp through to the end of the period. Y- you know, you want everything to wear out at once. You don’t want brand-new leading edge protection on a turbine that’s going to come down in a couple of years.
Um, so, you know, that’s, that’s one part of it. And then the other thing is, you know, turbines earlier in their lifetime, how can we optimize the maintenance schedule with leading edge erosion? Um, so, you know, like it’s a lot cheaper to, uh, replace the LEP if you get– catch it early, but then you don’t wanna be catching it too early and replacing it, you know, constantly when you, you don’t need to.
So, um, yeah, it, this, having this knowledge will enable a site-by-site operations and maintenance strategy with respect to leading edge protection. We also have some sites who are having trouble. They’ve got a full service agreement, and the OEM is [00:28:00] responsible for, um, doing the leading edge erosion repairs and protection replacement, but the owner is on the hook for paying for it.
At the other end, we’ve got people with full service agreements where technically the, um, manufacturer is supposed to be doing the leading edge protection and paying for it, but they argue about what, when does it need to be done. Because, you know, um, the operator might think if there’s no structural risk, then we don’t need to be replacing it.
And in the meantime, you’ve got turbines spinning around for years and years and years with, you know, these huge flakes of leading edge protection s- you know, causing the flow at the tip of the turbine to, to detach and to stall, and horrible aerodynamics, huge losses in power generation and revenue. And they’re having a big fight about, you know, is this necessary to do or not?
And then, you know, they’re just gonna put the exact same product on again ’cause the [00:29:00] OEMs are re- all really, really wedded to their own particular brand. It’s like, “Well, last time we had this product and it was factory applied, it lasted one year before it s- it was worse than, you know, if it wasn’t there at all.
Uh, we don’t really want you to put that one on again.” And so, you know, having the information that they need to be able to, you know, really bring data to these discussions and, you know, makes a, yeah, data not drama. That’s a, a good approach I think, um, for any kind of negotiation and especially in the case of leading edge erosion.
And then for the high temperature fatigue part of the problem, aside from, you know, just wanting to know are your blades aging, should you be looking at remediation action or changing the operation, the other really big key thing is, uh, you might need to have a fight with y- your OEM about if this turbine has been designed and operated correctly.
And so then having the data from this, um, project is going to give you the information that you need to come into that [00:30:00] argument with, again, the data not the drama. Um, and to, you know, in- increase your chances of succeeding in that kind of really tricky negotiation.
Allen Hall 2025: So if you’re an OEM or a manufacturer of equipment, an ISP, an operator, pretty much all aspects of wind operations, you probably ought to be getting a hold of Pardalote Consulting and Rosemary to talk about the opportunity to participate in this study.
How do people get ahold of you to, to do that?
Rosemary Barnes: People can go to our website, pardaloteconsulting.com, and get in touch via the contact form there, or you can, uh, look me up on LinkedIn, Rosemary Barnes. That’s probably the easiest, fastest way to get ahold of me personally.
Allen Hall 2025: Well, Rosemary, congratulations on the Energy Innovation Fund Awards and the new three-year effort.
If you are interested in participating with Pardalote Consulting and working with Rosemary and her team [00:31:00] in Australia, reach out to her on LinkedIn and get that process started, because this report and the data from all this analysis that’ll happen over the next couple of years will be important to the wind industry.
So you need to spend some time and get ahold of Rosemary and get this process started now. So Rosemary, congratulations. Uh, thanks for being back on the podcast, and looking forward to, uh, the next couple of years. It sh- should be exciting.
Rosemary Barnes: Thanks so much, Allen.
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