Energy Storage Is Strengthening Reliability. These 5 States Are Leading the Charge.

More states are building large batteries to store electricity and release it when demand peaks, which helps keep the grid stable during heat waves and reduces the price spikes that show up on power bills. Big battery installations have grown fast nationwide, from 6,000 megawatt-hours in 2020 to more than 175,000 megawatt-hours now, enough to power over 5 million homes for a day on one charge.

Several states have set official targets for this kind of storage. California passed its first target in 2010 and has far exceeded it, now with over 21,000 megawatts of storage; on one day this August, batteries supplied a third of the state's power during peak evening demand. Nevada set a 2030 goal of 1,000 megawatts and has already topped 1,700. Illinois passed a law this year aiming for 3,000 megawatts by 2030, plus a program that lets home battery systems help supply power when demand is highest — officials estimate this could save Illinois households and businesses $13.4 billion on electricity over 20 years. Virginia, facing fast-growing demand from data centers, expanded its targets to add nearly 21,000 megawatts of storage by 2045. Massachusetts hit its 2025 storage goal early and is now pushing for longer-duration storage.

None of this requires homeowners to do anything right now, but it points to why some states are pairing home battery systems with the grid and offering programs tied to them. What's available depends on where you live, so it's worth checking what your state offers.