China’s surging electric vehicles (EVs) ownership – now exceeding 25.5m – is opening the door to a new technology that can help to enhance the flexibility of electricity supply.
EVs connected via “vehicle-to-grid” (V2G) technology can function as “batteries on wheels” that charge and discharge according to the needs of the wider electricity system.
The idea of turning EVs into “power banks” has already sparked both business and political interest in China.
How can V2G help balance the grid?
V2G involves two-way electric charging that allows EVs to act as flexible power sources, which can potentially help with the electricity supply from the grid.
In China, EVs with bidirectional batteries, when plugged into V2G-capable charging stations, are able to sell their stored electricity back to the grid, once owners complete registration on WeChat.
The country is currently trialling the technology in nine “pilot cities”, including Shanghai, as well as Guangzhou and Shenzhen, where EV operators are able to sell electricity to the grid, according to a V2G policy announced in April.
The policy is the world’s first nationwide pilot that aims to roll out V2G at scale in major cities. Payments – either in cash or coupons – are provided to EV owners to offset their charging costs in industrial parks, ports, as well as malls and residential compounds.
This is, however, not the first top-level policy framework for V2G in China. In late 2023, the National Reform and Development Commission (NDRC) pledged to establish a system of V2G technical standards by 2025 and to test its potential.
Dr Muyi Yang, senior electricity analyst at thinktank Ember, tells Carbon Brief that the April policy sends a “signal that China’s energy transition is entering a deeper phase”.
He adds that this new policy marks a major step in integrating EVs with the power grid, considering that China is rapidly enlarging its renewable capacity. However, the country’s current grid system sometimes struggles to take in all of the electricity being generated.
“China’s wind and solar capacity is becoming too large for the current grid to handle,” Yang tells Carbon Brief. “With their [combined] capacity now exceeding that of coal power, the grid flexibility has become increasingly insufficient.”
A fleet of grid-connected EVs could help China achieve its broader plan to restructure its power sector towards a “new power system” that aims to be more flexible and responsive to power volatility, says Yang.
Equipped with V2G, EVs could charge up their batteries or sell stored electricity according to owners’ preferences and the overall needs of the power system.
This provides the means and potential for the grid to integrate renewable energy more flexibly, says Zhou Xiaohang, China clean-power project manager at the US-registered Natural Resource Defense Council in Beijing.
She tells Carbon Brief that, in the long run, V2G can help to address the curtailment issue for renewable energy, which is often referred to as the “Xiaona” problem in China.
What is the current state of V2G adoption?
Currently, V2G has not been widely deployed in China. The cost of V2G infrastructure installation remains high.
Zhou says the success of large-scale roll out of V2G depends on whether there are enough EVs equipped with the bidirectional batteries and able to be plugged into V2G-capable charging stations.
Data company China Automotive Technology and Research Centre says that the share of new car sales made up by “new-energy vehicles” (NEVs) – mostly EVs – is more than 40% in almost all nine pilot cities tapped to develop V2G.
Even though not all EVs support V2G, the large number of EVs on the road suggests strong potential to build it into a profitable commercial model.
Zhou says that since China “already [has] enough EVs on the road to make [V2G] possible”, there are “no major technical barriers to scale up V2G interaction”.
Meanwhile, popular car brands such as BYD and Nio have released new EV models with V2G features and many more are actively testing and preparing for two-way electric charging.
In a June podcast, Anders Hove, senior research fellow at the Oxford Institute for Energy Studies, says carmakers are pushing for faster progress. He explains:
“My understanding is that the Chinese EV and battery makers are communicating with grid companies and power-sector regulators that the technology is now ready. They would like there to be additional regulations to enable this to start happening at scale.”
There are 30 such demonstration projects going on at the moment. The results of those projects will be collected by the NDRC and the National Energy Administration for evaluating future scaleup.
Shenzhen, for example, received more than 70,000 kilowatt hours (kWh) of electricity from about 2,500 EVs in June.
V2G services have the potential to become popular nationwide, says Yang, partly because it could also become a source of income for EV owners and businesses.
According to the Paper, a Shanghai-based news outlet, an EV owner could earn roughly 500 yuan ($70) in electricity charging vouchers by discharging 460kWh in a month.
In Shenzhen, a logistics company with 30 EVs is estimated to save up to 4,500 yuan ($631) a month by joining the V2G programme, says China Automotive News, a state-sponsored media outlet.
What are the challenges in expansion?
Regional governments are working to introduce more profitable pricing systems to boost user participation.
Guangdong province, in south China, has launched a V2G pricing plan that is “appealing” enough for EV owners to see a profit from participating in the scheme, according to Zhou, which will help drive wider adoption.
However, there will need to be a deeper level of power-sector reform for V2G to become fully commercialised, says Shen Xinyi, researcher at Centre for Research on Energy and Clean Air (CREA).
Currently, a large share of China’s electricity is still traded through long-term power contracts, which could limit incentives for individual EV owners to engage in power trading.
Shen tells Carbon Brief:
“Flexible systems like V2G and distributed solar power need a well-developed spot market and experienced, professional players such as power retailers to truly thrive…I think it still needs a lot of patience to see how theory turns into practice.”
It could take years before V2G reaches a significant level of adoption, due to the uncertainty of whether it can be turned into a viable business model, says Shen.
According to Zhou, whether V2G can be rolled out at scale also depends on the attitudes of consumers.
“The key to expanding V2G is getting users motivated and willing to take part,” she says, adding that more work needs to be done to address Chinese consumers’ concerns on battery health and safety issues, including whether frequent discharges could cause battery degradation.
According to the 2023 policy, the lifespan of EV batteries still needs to improve so it can handle frequent use without wearing out too quickly – a concern long noted by the industry.
In April 2024, Hui Dong, chief technical expert at the China Electric Power Research Institute, a research institute affiliated to the State Grid Corporation of China, stated that, in terms of lifespan, chemical energy storage systems, represented by lithium-ion batteries, are still “underperforming”.
The post Q&A: How ‘vehicle-to-grid’ technology could boost China’s electricity system appeared first on Carbon Brief.
Q&A: How ‘vehicle-to-grid’ technology could boost China’s electricity system
Drought and heatwaves occurring together – known as “compound” events – have “surged” across the world since the early 2000s, a new study shows.
Compound drought and heat events (CDHEs) can have devastating effects, creating the ideal conditions for intense wildfires, such as Australia’s “Black Summer” of 2019-20 where bushfires burned 24m hectares and killed 33 people.
The research, published in Science Advances, finds that the increase in CDHEs is predominantly being driven by events that start with a heatwave.
The global area affected by such “heatwave-led” compound events has more than doubled between 1980-2001 and 2002-23, the study says.
The rapid increase in these events over the last 23 years cannot be explained solely by global warming, the authors note.
Since the late 1990s, feedbacks between the land and the atmosphere have become stronger, making heatwaves more likely to trigger drought conditions, they explain.
One of the study authors tells Carbon Brief that societies must pay greater attention to compound events, which can “cause severe impacts on ecosystems, agriculture and society”.
Compound events
CDHEs are extreme weather events where drought and heatwave conditions occur simultaneously – or shortly after each other – in the same region.
These events are often triggered by large-scale weather patterns, such as “blocking” highs, which can produce “prolonged” hot and dry conditions, according to the study.
Prof Sang-Wook Yeh is one of the study authors and a professor at the Ewha Womans University in South Korea. He tells Carbon Brief:
“When heatwaves and droughts occur together, the two hazards reinforce each other through land-atmosphere interactions. This amplifies surface heating and soil moisture deficits, making compound events more intense and damaging than single hazards.”
CDHEs can begin with either a heatwave or a drought.
The sequence of these extremes is important, the study says, as they have different drivers and impacts.
For example, in a CDHE where the heatwave was the precursor, increased direct sunshine causes more moisture loss from soils and plants, leading to a drought.
Conversely, in an event where the drought was the precursor, the lack of soil moisture means that less of the sun’s energy goes into evaporation and more goes into warming the Earth’s surface. This produces favourable conditions for heatwaves.
The study shows that the majority of CDHEs globally start out as a drought.
In recent years, there has been increasing focus on these events due to the devastating impact they have on agriculture, ecosystems and public health.
In Russia in the summer of 2010, a compound drought-heatwave event – and the associated wildfires – caused the death of nearly 55,000 people, the study notes.
The record-breaking Pacific north-west “heat dome” in 2021 triggered extreme drought conditions that caused “significant declines” in wheat yields, as well as in barley, canola and fruit production in British Columbia and Alberta, Canada, says the study.
Increasing events
To assess how CDHEs are changing, the researchers use daily reanalysis data to identify droughts and heatwaves events. (Reanalysis data combines past observations with climate models to create a historical climate record.) Then, using an algorithm, they analyse how these events overlap in both time and space.
The study covers the period from 1980 to 2023 and the world’s land surface, excluding polar regions where CDHEs are rare.
The research finds that the area of land affected by CDHEs has “increased substantially” since the early 2000s.
Heatwave-led events have been the main contributor to this increase, the study says, with their spatial extent rising 110% between 1980-2001 and 2002-23, compared to a 59% increase for drought-led events.
The map below shows the global distribution of CDHEs over 1980-2023. The charts show the percentage of the land surface affected by a heatwave-led CDHE (red) or a drought-led CDHE (yellow) in a given year (left) and relative increase in each CDHE type (right).
The study finds that CDHEs have occurred most frequently in northern South America, the southern US, eastern Europe, central Africa and south Asia.
Threshold passed
The authors explain that the increase in heatwave-led CDHEs is related to rising global temperatures, but that this does not tell the whole story.
In the earlier 22-year period of 1980-2001, the study finds that the spatial extent of heatwave-led CDHEs rises by 1.6% per 1C of global temperature rise. For the more-recent period of 2022-23, this increases “nearly eightfold” to 13.1%.
The change suggests that the rapid increase in the heatwave-led CDHEs occurred after the global average temperature “surpasse[d] a certain temperature threshold”, the paper says.
This threshold is an absolute global average temperature of 14.3C, the authors estimate (based on an 11-year average), which the world passed around the year 2000.
Investigating the recent surge in heatwave-leading CDHEs further, the researchers find a “regime shift” in land-atmosphere dynamics “toward a persistently intensified state after the late 1990s”.
In other words, the way that drier soils drive higher surface temperatures, and vice versa, is becoming stronger, resulting in more heatwave-led compound events.
Daily data
The research has some advantages over other previous studies, Yeh says. For instance, the new work uses daily estimations of CDHEs, compared to monthly data used in past research. This is “important for capturing the detailed occurrence” of these events, says Yeh.
He adds that another advantage of their study is that it distinguishes the sequence of droughts and heatwaves, which allows them to “better understand the differences” in the characteristics of CDHEs.
Dr Meryem Tanarhte is a climate scientist at the University Hassan II in Morocco, and Dr Ruth Cerezo Mota is a climatologist and a researcher at the National Autonomous University of Mexico. Both scientists, who were not involved in the study, agree that the daily estimations give a clearer picture of how CDHEs are changing.
Cerezo-Mota adds that another major contribution of the study is its global focus. She tells Carbon Brief that in some regions, such as Mexico and Africa, there is a lack of studies on CDHEs:
“Not because the events do not occur, but perhaps because [these regions] do not have all the data or the expertise to do so.”
However, she notes that the reanalysis data used by the study does have limitations with how it represents rainfall in some parts of the world.
Compound impacts
The study notes that if CDHEs continue to intensify – particularly events where heatwaves are the precursors – they could drive declining crop productivity, increased wildfire frequency and severe public health crises.
These impacts could be “much more rapid and severe as global warming continues”, Yeh tells Carbon Brief.
Tanarhte notes that these events can be forecasted up to 10 days ahead in many regions. Furthermore, she says, the strongest impacts can be prevented “through preparedness and adaptation”, including through “water management for agriculture, heatwave mitigation measures and wildfire mitigation”.
The study recommends reassessing current risk management strategies for these compound events. It also suggests incorporating the sequences of drought and heatwaves into compound event analysis frameworks “to enhance climate risk management”.
Cerezo-Mota says that it is clear that the world needs to be prepared for the increased occurrence of these events. She tells Carbon Brief:
“These [risk assessments and strategies] need to be carried out at the local level to understand the complexities of each region.”
The post Heatwaves driving recent ‘surge’ in compound drought and heat extremes appeared first on Carbon Brief.
Heatwaves driving recent ‘surge’ in compound drought and heat extremes
Greenhouse Gases
DeBriefed 6 March 2026: Iran energy crisis | China climate plan | Bristol’s ‘pioneering’ wind turbine
Welcome to Carbon Brief’s DeBriefed.
An essential guide to the week’s key developments relating to climate change.
This week
Energy crisis
ENERGY SPIKE: US-Israeli attacks on Iran and subsequent counterattacks across the Middle East have sent energy prices “soaring”, according to Reuters. The newswire reported that the region “accounts for just under a third of global oil production and almost a fifth of gas”. The Guardian noted that shipping traffic through the strait of Hormuz, which normally ferries 20% of the world’s oil, “all but ground to a halt”. The Financial Times reported that attacks by Iran on Middle East energy facilities – notably in Qatar – triggered the “biggest rise in gas prices since Russia’s full-scale invasion of Ukraine”.
‘RISK’ AND ‘BENEFITS’: Bloomberg reported on increases in diesel prices in Europe and the US, speculating that rising fuel costs could be “a risk for president Donald Trump”. US gas producers are “poised to benefit from the big disruption in global supply”, according to CNBC. Indian government sources told the Economic Times that Russia is prepared to “fulfil India’s energy demands”. China Daily quoted experts who said “China’s energy security remains fundamentally unshaken”, thanks to “emergency stockpiles and a wide array of import channels”.
‘ESSENTIAL’ RENEWABLES: Energy analysts said governments should cut their fossil-fuel reliance by investing in renewables, “rather than just seeking non-Gulf oil and gas suppliers”, reported Climate Home News. This message was echoed by UK business secretary Peter Kyle, who said “doubling down on renewables” was “essential” amid “regional instability”, according to the Daily Telegraph.
China’s climate plan
PEAK COAL?: China has set out its next “five-year plan” at the annual “two sessions” meeting of the National People’s Congress, including its climate strategy out to 2030, according to the Hong Kong-based South China Morning Post. The plan called for China to cut its carbon emissions per unit of gross domestic product (GDP) by 17% from 2026 to 2030, which “may allow for continued increase in emissions given the rate of GDP growth”, reported Reuters. The newswire added that the plan also had targets to reach peak coal in the next five years and replace 30m tonnes per year of coal with renewables.
ACTIVE YET PRUDENT: Bloomberg described the new plan as “cautious”, stating that it “frustrat[es] hopes for tighter policy that would drive the nation to peak carbon emissions well before president Xi Jinping’s 2030 deadline”. Carbon Brief has just published an in-depth analysis of the plan. China Daily reported that the strategy “highlights measures to promote the climate targets of peaking carbon dioxide emissions before 2030”, which China said it would work towards “actively yet prudently”.
Around the world
- EU RULES: The European Commission has proposed new “made in Europe” rules to support domestic low-carbon industries, “against fierce competition from China”, reported Agence France-Presse. Carbon Brief examined what it means for climate efforts.
- RECORD HEAT: The US National Oceanic and Atmospheric Administration has said there is a 50-60% chance that the El Niño weather pattern could return this year, amplifying the effect of global warming and potentially driving temperatures to “record highs”, according to Euronews.
- FLAGSHIP FUND: The African Development Bank’s “flagship clean energy fund” plans to more than double its financing to $2.5bn for African renewables over the next two years, reported the Associated Press.
- NO WITHDRAWAL: Vanuatu has defied US efforts to force the Pacific-island nation to drop a UN draft resolution calling on the world to implement a landmark International Court of Justice (ICJ) ruling on climate, according to the Guardian.
98
The number of nations that submitted their national reports on tackling nature loss to the UN on time – just half of the 196 countries that are part of the UN biodiversity treaty – according to analysis by Carbon Brief.
Latest climate research
- Sea levels are already “much higher than assumed” in most assessments of the threat posed by sea-level rise, due to “inadequate” modelling assumptions | Nature
- Accelerating human-caused global warming could see the Paris Agreement’s 1.5C limit crossed before 2030 | Geophysical Research Letters covered by Carbon Brief
- Future “super El Niño events” could “significantly lower” solar power generation due to a reduction in solar irradiance in key regions, such as California and east China | Communications Earth & Environment
(For more, see Carbon Brief’s in-depth daily summaries of the top climate news stories on Monday, Tuesday, Wednesday, Thursday and Friday.)
Captured
UK greenhouse gas emissions in 2025 fell to 54% below 1990 levels, the baseline year for its legally binding climate goals, according to new Carbon Brief analysis. Over the same period, data from the World Bank shows that the UK’s economy has expanded by 95%, meaning that emissions have been decoupling from growth.
Spotlight
Bristol’s ‘pioneering’ community wind turbine
Following the recent launch of the UK government’s local power plan, Carbon Brief visits one of the country’s community-energy success stories.
The Lawrence Weston housing estate is set apart from the main city of Bristol, wedged between the tree-lined grounds of a stately home and a sprawl of warehouses and waste incinerators. It is one of the most deprived areas in the city.
Yet, just across the M5 motorway stands a structure that has brought the spoils of the energy transition directly to this historically forgotten estate – a 4.2 megawatt (MW) wind turbine.
The turbine is owned by local charity Ambition Lawrence Weston and all the profits from its electricity sales – around £100,000 a year – go to the community. In the UK’s local power plan, it was singled out by energy secretary Ed Miliband as a “pioneering” project.
‘Sustainable income’
On a recent visit to the estate by Carbon Brief, Ambition Lawrence Weston’s development manager, Mark Pepper, rattled off the story behind the wind turbine.
In 2012, Pepper and his team were approached by the Bristol Energy Cooperative with a chance to get a slice of the income from a new solar farm. They jumped at the opportunity.
“Austerity measures were kicking in at the time,” Pepper told Carbon Brief. “We needed to generate an income. Our own, sustainable income.”
With the solar farm proving to be a success, the team started to explore other opportunities. This began a decade-long process that saw them navigate the Conservative government’s “ban” on onshore wind,