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Maguire: US battery storage sector keeps accelerating its momentum

Battery-deployed electric volumes are breaking records almost every month, as the rapid growth of battery installation is affecting power systems in the United States.

Battery storage is now more efficient than other energy sources during key times in certain electricity markets.

Batteries also stabilize electricity networks, by controlling frequency and voltage levels and by preventing overloads on the grid by storing excess solar energy output and then releasing that power during peak usage periods.

The following key trends will help you track the continued growth of battery systems in U.S. utilities networks.

WIDENING REACH

Battery systems have played a small role in the U.S. electric grids until recently. Utilities focused on increasing capacity through natural gas plants and solar and wind farms, among other sources.

According to the energy data portal Cleanview, in 2020 there will be 30 times more solar and 74 times as much wind farm capacity in the U.S. than battery capacity.

The dramatic drop in battery system costs - as much as 40 percent a year, according to industry consultants since 2022 - has helped spur the uptake of large solar farms across many U.S. states.

Battery capacity is increasing and solar and wind power will be 5 times less in April 2025 than they are today.

Batteries are primarily used by utility networks to store excess power generated from solar farms in the middle of the night, when power prices and system demand are at their lowest. They then discharge the batteries when prices and demand rise.

The combination of solar and batteries allows utilities to avoid having to reduce output across their network at the height of the solar period, as well as capture higher power prices overall by preventing mid-day price drops.

According to Cleanview, the U.S. had a utility battery capacity of just over 30,000 megawatts in April 2025.

This total is over 28,000MW higher than what was available in 2020. Solar power grew by 84,200MW, while wind power grew by 37,000MW during the same period.

Batteries are expected to be the main focus of future development for utilities.

GROWING IMPACT

There are 19 states that have 100 MW of battery storage or more.

California has the largest battery storage system in the country, at around 13,000 MW, or 42%.

California Independent System Operator, or CAISO, is the largest user of batteries among the major U.S. electric networks. It uses them to maximize the impact and uptake of its solar system.

According to the California Energy Commission, CAISO has a solar power capacity of 21,000 MW and a battery capacity of 12,400 MW.

This large battery capacity allows CAISO use batteries to provide power during periods of high demand, especially during early evenings when solar output drops and household electricity demands increase.

According to the electricity portal GridStatus.io, between 7 p.m. - 9 p.m. June 19, batteries accounted for 26% of all electricity supplied during that time.

CAISO's second largest energy source was natural gas, which accounted for 23% of its supply. Wind and hydro were the next two sources.

Electric Reliability Council of Texas is the primary electricity market in Texas. It has been a recent adopter of batteries, adding more battery capacity to its system than any other state.

GridStatus.io shows that Texas installed around 8,200MW of battery capacity in April. This helped to supply around 7-8% of ERCOT’s total power on the evening of 19th June.

Arizona, Nevada, and New Mexico are also rapidly expanding their battery footprints. These states have a growing amount of utility-scale capacity that can be harnessed better when combined with battery systems.

Battery systems are expected to be more widely adopted as battery prices continue to fall due in part to the competition between vendors and the commercialization of new products.

According to a recent report from asset management firm Lazard, the levelized cost of electricity generated by utility-scale solar farms coupled with batteries ranges between $50 and $131 for each megawatt-hour (MWh), depending upon system size.

This compares with $47 to $170 for new natural-gas peaking plants and $24 to $39 per MWh combined cycle gas plants. New coal-fired power plants can cost up to $114 a MWh.

The cost of batteries will continue to decrease, and this should help solar power to penetrate areas that are less sunny.

This should lead to a gradual expansion of battery systems in U.S. electric networks over the next few years.

These are the opinions of a columnist who writes for.

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(source: Reuters)