Ye Huang is a senior researcher at Global Energy Monitor (GEM), where she tracks and analyses global renewable energy developments. Christine Shearer is project manager of GEM’s Global Coal Plant Tracker (GCPT).

As batteries redefine how power systems handle peak demand in the United States, a central question for the global clean energy transition is whether China can follow a similar path and move beyond coal-based backup power.

Batteries now regularly provide roughly one-quarter of California’s peak demand during high-load periods following rapid growth in the US in recent years. In contrast, power generation from natural gas-fired plants fell by 17% year-on-year during the spring and summer of 2025.

Highlighting the strides made in the country’s most populous state, the battery fleet of the California Independent System Operator (CAISO), the state power system, set a new record on August 6, 2025 – discharging 11.2 gigawatts (GW) during the evening peak.

California’s experience mirrors a wider national shift. US battery storage has grown at an annual rate of more than 60% for the past five years, increasing its share of the power mix and reducing dependence on fossil fuel-powered “peakers” – plants which operate for brief periods to avert outages at times of high demand.

Clean alternative to polluting peakers

The US had 999 peaker units in 2021, most fuelled by natural gas. Peakers typically run fewer than 100 to 400 hours per year, usually for short intervals of less than four hours.

As well as being costly to operate due to low efficiency, frequent cycling and rising maintenance costs, the peaker units also emit disproportionately high levels of air pollutants. The Clean Energy Group has found that more than 4.4 million Americans live within one mile (1.6 km) of a peaker plant, largely low-income and historically disadvantaged urban neighborhoods, exposing them to worse air pollution and increased health risks.

But with about 150 GW of peak capacity expected to retire in the US over the next 15 years, battery storage is emerging as a viable alternative.

Compared to the peakers, batteries offer a faster response, greater efficiency and significant environmental benefits. Technological advances are expanding the range of services batteries can provide, making medium-duration storage (less than 12 hours) an increasingly viable option to meet the integration needs of high-renewable systems.

Trump leaves battery incentives alone

Federal policy has laid the foundation for the transition to battery storage in California and elsewhere.

FERC Order 841 allows energy storage to participate directly in wholesale electricity markets, enabling batteries to compete with conventional generators for energy and grid services, as well as receive capacity payments in the same way as fossil peakers.

The Inflation Reduction Act of 2022 further accelerated deployment by extending the Investment Tax Credit to standalone storage, supporting private-sector investment. Unlike incentives for wind and solar, those for battery storage have been largely preserved under the Trump administration.

States are increasingly leveraging storage to replace peakers. California, for instance, explicitly targets battery storage to meet reliability and emissions goals, planning to add 15.7 GW of four-hour batteries and 2.8 GW of eight-hour batteries while cutting natural gas use by 70% by 2035.

China’s critical clean energy juncture

China is facing growing flexibility needs due to its recent record-breaking solar and wind capacity additions.

It has been heavily promoting the use of “flexible” coal-fired power to back up its growing variable power sources and meet peak demand. “Flexible” coal power in China refers to retrofitting coal-fired units so that their minimum output can fall to 35% or lower of rated capacity. At present, nearly half of China’s coal fleet (600 GW) is categorised as dispatchable for flexibility needs.

Global renewables goal slips off course after Trump, China moves

However, this reliance on coal is problematic. As historically base-load units, coal plants inherently have slower response times and generate significant pollution, making them ill-suited for frequent ramping. Even with generous and guaranteed capacity payments, many of these coal units struggle to operate profitably. Additionally, the “flexible” coal power policy has been used to justify the continued large buildout of coal power in China, which hit a 10-year record for construction in 2024.

China is already the world’s largest market for battery storage, and installations are accelerating rapidly. Battery storage and demand response could together provide nearly 60% of China’s short-term flexibility needs by 2030, according to the International Energy Agency (IEA).

The US shows what is possible when policy, markets and technology align. China needs to take swift, decisive action to shift from “flexible” coal to battery storage. If batteries are to play a central role, strengthening market mechanisms is a key step.

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China is on track to establish provincial electricity spot markets in which battery storage will be formally recognised as a market participant for grid peak regulation services. Additionally, establishing capacity mechanisms, including implementing capacity payments for battery storage, would further incentivise deployment. Increasing utilisation is also essential: recent policy explicitly calls for higher dispatch levels of battery storage and prioritising its use in system regulation.

Encouraging battery storage to replace fossil peaker plants is not only an effective way to accelerate China’s “dual-carbon” goals, but also helps China to consolidate its global leadership in the battery storage industry. China has the resources, the market momentum and the industrial know-how to leapfrog “flexible” coal and make batteries the backbone of its clean and flexible grid. The question is not whether it can, but how quickly it will do so.

The authors are grateful to Xing Zhang for helpful discussions that informed this article.

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To break its coal habit, China should look to California’s progress on batteries