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Significant Growth in US Residential Solar-Plus-Storage Installations
In 2025, over one-third of new US residential solar installations included battery storage, rising from 25% in 2024 to 37%. California remains a leader, driven by policy changes, but growth is also spreading to other states. The discharge capacity of these systems significantly increased, partly due to the deployment of the Tesla Powerwall 3.
In 2025, over one-third of new residential solar installations in the United States included battery storage. This indicates a shift where batteries are increasingly becoming a standard component of rooftop solar projects, rather than an optional addition.
According to the latest 'U.S. Distributed Solar and Storage Data' update from Lawrence Berkeley National Laboratory, 37% of new residential photovoltaic systems were paired with battery storage in 2025, a significant increase from 25% in 2024. The annual dataset encompasses approximately 5.3 million distributed solar and solar-plus-storage systems installed through the end of 2025, with about 450,000 systems installed in 2025 alone.
California continues to be a major driver of this trend. In this state, approximately 74% of new residential solar installations included storage in 2025, up from 58% in 2024. This development follows California's transition to its Net Billing Tariff (NEM 3.0) in April 2023, which reduced the value of exported electricity and made storing excess daytime generation for later use more attractive. This policy quickly altered the composition of California's residential rooftop solar market, with over half of customers pairing batteries with their systems, compared to about 20% in October 2023.
However, growth is no longer limited to California. Outside the state, battery attachment rates more than doubled from 2024 to 2025. While Berkeley Lab did not attribute this increase to a single factor, installers in other markets are also increasingly facing changes to net-metering structures and time-of-use electricity rates. These changes enhance the value of consuming stored solar power over exporting it. Storage adoption also increased in the non-residential market, albeit at a lower level, from 7% in 2024 to 11% in 2025.
The median energy storage capacity of residential batteries remained stable at 13.5 kWh in both 2024 and 2025. However, the discharge capacity of these systems sharply increased, from a median of 6 kW in 2024 to 11.4 kW in 2025. Berkeley Lab attributes much of this increase to the growing deployment of the Tesla Powerwall 3, which offers a higher discharge capacity than previous versions.
This data, which measures how often installers pair batteries with new solar projects, suggests that solar-plus-storage is rapidly becoming a larger part of the U.S. residential market. The information for this article is sourced from pv magazine.
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Talk to Oranje-Eco →This article is an Oranje-Eco summary of a report by pv magazine. Read the original: pv magazine.
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