simplesolarllc.com Solar Basics & Home Energy

Statistics

Rooftop Solar Adoption Statistics: U.S. Trends, System Sizes, and Storage

Explore U.S. rooftop solar adoption statistics, including system counts, state generation, residential system sizes, battery pairing, and adopter financing, with clear notes on what each measure covers.

November 12, 2026 6 min read simplesolarllc.com Editorial Team

Contents

Rooftop solar adoption statistics: what the national counts cover

Berkeley Lab’s address-level records include roughly 5.3 million U.S. distributed solar systems through 2025. That is a broad distributed-PV count: it includes residential systems, roof-mounted non-residential systems, and ground-mounted non-residential systems up to 7 megawatts of direct-current capacity. It should not be read as a count of homes with rooftop panels.

The records include 450,000 systems installed in 2025 and cover an estimated 93% of the U.S. market for that year. A separate dataset containing system attributes covers 4.3 million systems cumulatively through 2025, or an estimated 75% of the market; for 2025 installations alone, it covers 300,000 systems, or 61%. These coverage rates refer to different datasets and should not be combined as though they described the same set of records. The market totals used for comparison draw on industry estimates, including Wood Mackenzie and SEIA for years after 2010. Berkeley Lab’s 2026 distributed solar and storage update

Rooftop solar adoption statistics by state: generation is not household adoption

U.S. generation from small-scale solar PV—systems below 1 megawatt—rose from 18,812 gigawatt-hours (GWh) in 2016 to 92,979 GWh in 2025, according to the Energy Information Administration (EIA). This measure covers residential, commercial, and industrial uses. It tracks electricity generated, not the number of residential systems or households adopting solar. EIA, “U.S. small-scale solar generation has quadrupled in the last decade”

California accounted for 37% of U.S. small-scale solar generation in 2025: 34,411 GWh. Its small-scale capacity rose from 18 gigawatts in 2024 to 20 gigawatts in 2025, while generation increased 8% over that year. Arizona produced 5,795 GWh, more than 6% of the national total, and its generation grew 6% year over year in 2025. Arizona’s largest annual increase in the period discussed was 22%, from 2022 to 2023.

Longer comparisons show how output expanded in other large states. Texas small-scale generation grew from 391 GWh in 2016 to 5,408 GWh in 2025; Florida’s rose from 205 GWh to 5,198 GWh over the same period. These are electricity-generation figures, not direct comparisons of how many homes have panels.

EIA’s 2024 state estimates provide a separate residential measure: consumption of small-scale solar PV electricity. California’s estimate was 21,998 million kilowatt-hours (kWh); Arizona’s was 4,236 million kWh; and Florida’s was 4,195 million kWh. These values describe estimated residential consumption, not installed capacity, system counts, or adoption rates. EIA Table F40: Solar energy consumption estimates, 2024

Rooftop solar adoption statistics for system size and roof coverage

Among U.S. residential systems installed in 2025, the median size was 7.7 kW direct current (kWDC), up 0.5 kW from 2024. The 2024 median was 7.2 kW. In 2025, the 20th-to-80th-percentile range was roughly 5 to 12 kWDC, indicating that the median is only a midpoint; installations varied considerably around it. Berkeley Lab’s 2026 update; Berkeley Lab’s 2025 update

System size is only one way to describe a rooftop array. Berkeley Lab defines roof-coverage ratio as the share of total roof space covered by PV. For residential systems in its 2024 sample, the median was 25%. The median varied by building type: 22% for systems on single-story homes and 32% for those on multi-story homes. These are sample medians for installed systems, not the share of all homes whose roofs carry panels.

The 2024 residential installation sample also had a median module efficiency of 20.9%. Microinverters were used in 56% of residential systems in that sample, up from 33% in 2019. Efficiency describes the modules’ conversion performance; the microinverter figure describes equipment used in systems. Neither statistic alone establishes how much electricity a particular home produces. Berkeley Lab’s 2025 update

Rooftop solar adoption statistics for battery pairing

Storage has become more common alongside new residential PV installations. The share paired with a battery rose from 25% in 2024 to 37% in 2025. This attachment rate counts batteries installed with new PV systems; it does not include batteries added later or standalone storage. Non-residential attachment reached 11% of U.S. PV installations in 2025, with the report’s measure covering small and large non-residential systems. Berkeley Lab’s 2026 update

Rates differed substantially by state in Berkeley Lab’s 2024 residential sample. Hawaii’s storage attachment rate was 85%, and California’s was 57%, up from 14% in California in 2023. In states other than California and Hawaii, the average reached 6% of new residential PV installations in 2024. The state estimates were reported only where the underlying data covered at least half of that state’s market volume, so the figures do not represent identical coverage everywhere. Berkeley Lab’s 2025 update

For residential batteries paired with PV in the 2025 data, median storage capacity was 13.5 kilowatt-hours (kWh). Those sizing observations came primarily from California—about 80% of the data. The prior year’s sample showed 74% of paired residential batteries at 15 kWh or less, 23% between 15 and 30 kWh, and 3% above 30 kWh. The capacity categories describe battery energy storage, not solar-panel output. Berkeley Lab’s 2026 update; Berkeley Lab’s 2025 update

Rooftop solar adoption statistics: income and financing patterns

Income comparisons help describe who appears in residential installation records, but they do not show how many households in each income group adopted solar. In Berkeley Lab’s 2024 adopter cohort, median estimated household income was 39% higher than the median for all households in the same county. The comparison is local to each adopter’s county; it is not a comparison with one national income benchmark.

The same installation sample was concentrated in states grouped by higher median household income: 57% of adopters were in high-income states, 35% in middle-income states, and 8% in low-income states. These categories group states by state median household income, with roughly equal numbers of households in each group. They describe where sampled installations occurred, not the income distribution of every solar household or the adoption rate among residents of those states. Berkeley Lab’s 2025 update

Financing also varied by estimated household income. Among 2024 adopters estimated to earn $0–$50,000, 36% paid cash, 49% used loans, and 15% used third-party ownership (TPO). In the $50,000–$100,000 group, the shares were 37% cash, 46% loans, and 17% TPO. These are financing shares among adopters in the stated income bands, not shares of all households in those bands.

Across residential installations overall, TPO increased from 26% in 2023 to 43% in 2024. TPO refers to arrangements in which a third party owns the system; the statistic does not indicate the exact terms or costs of any individual contract. Berkeley Lab’s 2025 update

A separate 2023 analysis found that about 49% of residential adopters had incomes below 120% of area median income (AMI), and 26% were below 80% of AMI. System size also differed across the income groups reported: the median was 6.4 kW for households earning under $50,000 and 8.0 kW for those earning over $200,000. These findings use area-relative thresholds for AMI and estimated household-income brackets for the system-size comparison. Berkeley Lab, “Residential Solar-Adopter Income and Demographic Trends: 2024 Update”

Rooftop solar adoption statistics and solar on new homes

Solar is also tracked in new-home construction, a distinct measure from retrofits on existing roofs. Berkeley Lab’s Solar New Home Attributes dataset contains information on approximately 450,000 new homes constructed with solar. That is the size of a dataset, not an annual installation total; its description does not specify the construction-year range represented in that count.

The associated Solar New Home Shares dataset reports estimated county and state shares by year through 2024. Those shares can describe solar’s presence in new construction, but they should not be treated as adoption rates across all existing homes. Berkeley Lab, “Solar on Residential New Construction Datasets”

Sources

Written by

simplesolarllc.com Editorial Team

Editorial team

Independent editorial coverage of solar basics & home energy.

More to Explore