The Rise of Home Battery Storage: Where and Why Adoption Is Growing

Berkeley Lab’s 2026 Distributed Solar and Storage Data Update covers about 5.3 million distributed solar systems through the end of 2025 and represents an estimated 93% of the U.S. distributed-solar market installed that year. Its latest residential data show a sharp rise in battery attachment across both California and the rest of the country.

California’s 74% rate means batteries accompanied nearly three out of every four new residential PV installations in Berkeley’s dataset. The combined non-California market remains much lower at 17%, but its jump from 7% is significant. Berkeley also identifies Arizona and Texas as states with particularly large increases in 2025.

The geographic gap tells us that hardware improvements alone cannot explain the market. The same battery can have a very different financial value under different utility rates and export rules.

Under traditional net metering, exporting excess rooftop solar could offset a substantial amount of electricity purchased from the grid. That reduced the financial need to store every extra kilowatt-hour at home.

California’s newer Net Billing Tariff changed that calculation. Export compensation is generally lower than the retail electricity rate and varies by hour. The California Public Utilities Commission specifically notes that batteries can increase savings by shifting electricity into more valuable periods.

An earlier Berkeley Lab analysis found storage attachment of roughly 60% among projects under the newer tariff versus about 10% under the former NEM structure. Those cohorts should not be confused with the statewide 74% figure for 2025, but the difference provides unusually strong evidence that export economics can alter consumer behavior.

This helps explain why battery adoption can surge even while storage remains a substantial additional investment. The value of the battery depends on what the homeowner can do with each stored kilowatt-hour after it is installed.

Hawaii is one of the country’s highest-attachment markets, and Hawaiian Electric’s BYOD Plus program shows how a household battery can become a grid resource. Participating systems can serve the home first and then export available energy during scheduled periods.

Arizona offers another example. APS Storage Rewards currently pays participating customers based on average battery power delivered during high-demand conservation events. That program does not explain Arizona’s entire storage increase, but it demonstrates another way batteries can create value after purchase.

Texas is moving in the same broad direction through a different market structure. ERCOT’s Aggregate Distributed Energy Resource pilot allows groups of smaller distribution-connected resources, including batteries, to participate collectively. Berkeley’s identification of Texas as a large-growth market is therefore important: high battery attachment is beginning to appear outside the policy structures that first drove California and Hawaii.

Puerto Rico shows the resilience side most clearly. Severe hurricane damage and prolonged outages have made reliable household electricity unusually valuable. The U.S. Department of Energy says more than 6,000 qualifying households have received rooftop solar-and-storage systems through the Puerto Rico Energy Resilience Fund effort. For more context on why backup needs vary so widely, see our analysis of whether U.S. power outages are getting worse and where Americans face the strongest backup-power pressure.

A Battery Can Manage Bills and Provide Backup

Those uses often overlap. A battery can store low-value solar for the evening, reduce purchases during expensive hours, respond to a grid program and still retain some capacity for an outage.

There is a tradeoff, however. Every kilowatt-hour deliberately held in reserve is energy that cannot be used for everyday bill management. A 2025 Berkeley Lab modeling study found that holding larger reserves reduced more bill-saving value than it added in reliability value for many modeled customers. Higher reserves became more worthwhile when outages were more frequent or costly.

Batteries Still Carry a Significant Price Premium

Rapid adoption also does not mean installed storage has become cheap. In Berkeley’s 2025 known cash-purchase sample, the median paired solar-and-storage price was $5.10 per watt of PV capacity, compared with $3.00/W for solar alone. Roughly 80% of Berkeley’s paired-system pricing observations came from California, so those numbers should not be treated as a national installed-price benchmark.

The useful takeaway is simpler: storage adoption surged while batteries remained a meaningful additional investment. Falling technology costs have helped, but local electricity economics and resilience value are doing a large share of the work.

Through 2025, qualifying homeowners could claim a 30% Residential Clean Energy Credit for eligible battery-storage costs. The IRS confirms that Section 25D is no longer available for expenditures after December 31, 2025.

Residential storage still entered 2026 at a record pace. The American Clean Power Association and Wood Mackenzie reported 1.3 GWh of residential storage installations in the first quarter of 2026, up 86% from a year earlier. They also cautioned that some early-2026 volume came from projects initiated in late 2025 as customers and installers worked around the expiring credit, and their current outlook calls for a modest 5% contraction in residential installations for full-year 2026.

That makes the coming period more revealing than another record quarter. Where storage keeps growing, the case will increasingly rest on the battery’s ongoing value: shifting solar into better hours, avoiding expensive grid electricity, earning payments through utility or grid programs, and keeping important loads running when the power fails.

For the broader household-resilience picture, including generators, outages, electricity prices and portable systems, see our State of Home Backup Power in America 2026.