Rooftop solar sits within a much larger photovoltaic market. The figures below distinguish rooftop proxies from all-sector or all-PV measures, and separate observed results from estimates, technical potential, and forecasts.
Key Rooftop Solar Statistics
The most broadly useful figures span technical potential, output, market scale, storage, and future adoption:
- In 2024, about 550 GW of solar PV was added worldwide, nearly 30% above 2023.
- At the end of 2024, estimated global solar PV capacity reached 2.2 TW, covering utility-scale and distributed PV.
- In 2024, solar PV supplied more than three-quarters of global renewable capacity additions.
- In 2024, China added more than 340 GW of solar PV, about 30% more than in 2023.
- In 2024, China’s residential PV market reached 30 GW, representing under 10% of China’s PV additions.
- In 2024, the European Union installed around 60 GW of solar PV.
- In 2024, the United States added almost 50 GW of solar PV to the grid.
- In 2024, U.S. residential-sector small-scale solar generation reached 57,547 thousand MWh, an EIA estimate and rooftop proxy.
- From 2016 to 2024, U.S. residential-sector small-scale solar generation rose from 10,595 to 57,547 thousand MWh.
- In 2024, New York generated 7,650 thousand MWh of solar PV, up 23.3% from 2023 across all sectors.
- In 2024, Ohio’s solar PV generation rose 150.6% to 4,510 thousand MWh, with the percentage change affected by the prior-year base.
- U.S. rooftops suitable for solar cover more than 8 billion square meters, according to an NREL analysis published in 2016.
- U.S. rooftop technical potential exceeds 1 TW of solar capacity, but this is addressable potential rather than deployment.
- In 2024, more than 28% of U.S. residential solar systems included batteries.
- In 2024, about 500,000 U.S. homes had solar-plus-battery systems in SEIA year-in-review data.
- By 2030, nearly 14% of U.S. homes were projected to have solar PV, a forecast rather than observed adoption.
- In 2024, global power-sector investment in solar PV was projected to exceed $500 billion, covering all solar PV.
- In 2023, each dollar invested in wind and solar PV yielded 2.5 times more energy output than a dollar invested roughly a decade earlier.
Contents
- Key Rooftop Solar Statistics
- U.S. Rooftop Solar Potential and Addressable Roofs
- Global Rooftop and Distributed Solar Growth
- Residential Rooftop Solar Output and Adoption
- U.S. State Rooftop Solar Generation Trends
- Rooftop Solar Costs, Investment, and Market Scale
- Rooftop Solar Storage and Future Outlook
U.S. Rooftop Solar Potential and Addressable Roofs
The U.S. Department of Energy summarizes an NREL rooftop-potential analysis published in 2016. It estimates technical opportunity, not the number of installed systems or the amount of electricity currently produced.
- Suitable U.S. rooftops cover more than 8 billion square meters.
- U.S. rooftop technical potential exceeds 1 TW of solar capacity.
- Residential and other small rooftops account for about 65% of national rooftop potential.
- About 42% of residential rooftops are associated with low-to-moderate-income households.
- An average of 3.3 million U.S. homes are built or need roof replacement each year.
- Those new or replacement roofs represent roughly 30 GW of annual solar potential.
The same DOE source describes tools that help characterize individual buildings. Sun Number rates rooftop suitability on a 1-to-100 scale, while Zillow solar-potential listings covered more than 40 million homes after its partnership with Sun Number.
These measures should not be read as adoption rates. Roof size, shading, tilt, location, construction, household economics, and system economics affect whether technical potential becomes a project. U.S. Department of Energy, “Solar Rooftop Potential”
Global Rooftop and Distributed Solar Growth
Worldwide PV statistics provide essential context, but most global figures combine utility-scale plants with distributed and rooftop systems. The International Energy Agency notes that 2024 values combine actual and estimated additions.
| Market or measure | 2024 result | Scope |
|---|---|---|
| Worldwide solar PV additions | About 550 GW | All PV; nearly 30% above 2023 |
| Worldwide installed PV capacity | Estimated 2.2 TW at year-end | All PV |
| China solar PV additions | More than 340 GW | All PV; about 30% above 2023 |
| European Union PV additions | Around 60 GW | All PV |
| United States PV additions | Almost 50 GW | All PV added to the grid |
| India PV additions | Around 30 GW | All PV; nearly triple 2023 growth |
| Brazil PV additions | More than 16.5 GW | Utility-scale and distributed PV |
Solar PV supplied more than three-quarters of global renewable capacity additions in 2024. In China, utility-scale plants drove more than 60% of PV expansion, while the remainder included distributed commercial, industrial, and residential PV.
China’s residential PV market was 30 GW in 2024 and represented under 10% of China’s PV additions. By comparison, residential systems averaged approximately one-fifth of China’s annual PV additions from 2019 through 2023, before later incentive changes.
These figures show the scale of the surrounding PV market rather than rooftop-only deployment. International Energy Agency, “Global Energy Review 2025: Electricity”
Residential Rooftop Solar Output and Adoption
EIA’s sector series is useful for tracking residential small-scale solar, but small-scale generation is not identical to rooftop-only generation. The figures are estimates for the U.S. residential sector.
| Year | Residential small-scale solar generation |
|---|---|
| 2016 | 10,595 thousand MWh |
| 2023 | 49,273 thousand MWh |
| 2024 | 57,547 thousand MWh |
The 2024 estimate therefore sits well above the 2016 and 2023 observations in the EIA series. It should not be combined with all-sector state totals as if the measures had the same coverage.
Selected residential estimates for 2024 were:
- Texas: 4,443 thousand MWh.
- Arizona: 4,236 thousand MWh.
- Florida: 4,195 thousand MWh.
- New York: 2,033 thousand MWh.
- Massachusetts: 1,689 thousand MWh.
The figures describe estimated generation, not a count of households, systems, panels, or roofs. They also do not measure household participation directly because a generation series can include different system sizes and operating conditions. U.S. Energy Information Administration, “Table 3.21. Net Generation from Solar Photovoltaic by State, by Sector, 2024 and 2023”
U.S. State Rooftop Solar Generation Trends
State totals are broader than rooftop generation: EIA’s 2024 totals combine utility-scale and small-scale sectors. They are still useful for comparing the direction and scale of solar PV generation across states.
| State | 2024 solar PV generation | Change from 2023 | Scope |
|---|---|---|---|
| Massachusetts | 6,185 thousand MWh | Up 8.1% | All sectors |
| New York | 7,650 thousand MWh | Up 23.3% | All sectors |
| Pennsylvania | 2,069 thousand MWh | Up 48.9% | All sectors |
| Illinois | 4,787 thousand MWh | Up 38.9% | All sectors |
| Indiana | 3,478 thousand MWh | Up 57.9% | All sectors |
| Michigan | 2,205 thousand MWh | Up 40.8% | All sectors |
| Ohio | 4,510 thousand MWh | Up 150.6% | All sectors |
Ohio recorded the largest percentage increase among these observations, but its 150.6% change is influenced by the prior-year base. A percentage change in all-sector generation also cannot identify how much of the change came from rooftops.
The state-level data is therefore best used as generation context. For rooftop-specific interpretation, the residential small-scale series and its stated limitations are the closer proxy. U.S. Energy Information Administration, “Table 3.21. Net Generation from Solar Photovoltaic by State, by Sector, 2024 and 2023”
Rooftop Solar Costs, Investment, and Market Scale
Cost and investment statistics often cover solar PV or clean energy more broadly than residential rooftops. They help explain market conditions, but they are not household system prices or rooftop-only spending.
The IEA projected that global power-sector investment in solar PV would exceed $500 billion in 2024. It also reported that solar panel costs fell 30% over the two years before its 2024 assessment; that is a panel-cost trend, not a complete installed rooftop-system price.
Other IEA investment measures included:
- Clean-energy investment in emerging-market and developing economies outside China was expected to approach $320 billion in 2024.
- Africa’s clean-energy investment exceeded $40 billion in 2024, nearly double its 2020 level.
- In the IEA assessment, renewables represented half of power-sector investment in emerging-market and developing economies outside China; this wording is broader than rooftop solar.
- In 2023, each dollar invested in wind and solar PV yielded 2.5 times more energy output than a dollar invested roughly a decade earlier.
SEIA’s latest summary reported nearly 299 GWdc of installed U.S. solar capacity and average annual deployment growth of 26% over approximately the prior decade. Its homes-equivalent conversion said operating U.S. solar capacity could power more than 50 million homes, which is not a count of solar households.
Nearly 280,000 Americans worked in solar in 2023, according to direct solar employment data from IREC cited by SEIA. This employment figure covers the solar industry, not rooftop-only work. International Energy Agency, “World Energy Investment 2024: Overview and key findings” Solar Energy Industries Association, “Solar and Storage Industry Research Data”
Rooftop Solar Storage and Future Outlook
Battery attachment is one of the clearest indicators of how residential solar systems are expanding beyond generation alone. SEIA’s 2024 year-in-review data reported that more than 28% of U.S. residential solar systems installed in 2024 included batteries, and about 500,000 U.S. homes had solar-plus-battery systems.
The same source projected that nearly 14% of U.S. homes would have solar PV by 2030. This is a forecast for residential solar PV, not an observed 2030 adoption rate and not limited to new rooftop installations.
SEIA’s broader storage and manufacturing measures add market context:
- U.S. solar and storage represented more than 71% of new electricity capacity added in the first half of 2026.
- The United States installed 30 GWh of energy storage in the first half of 2026.
- Installed U.S. energy storage reached 195 GWh in the latest SEIA summary, up 207% since the end of 2023.
- The installed U.S. storage fleet could power 5.9 million American homes for one day on a single charge, an SEIA capacity conversion rather than a count of battery-equipped homes.
- U.S. module-manufacturing capacity exceeded 52 GW in the 2024 year-in-review cheat sheet.
- The 2024 U.S. solar market grew at an average 28% annually over approximately the prior decade.
The storage figures include technologies beyond residential rooftop batteries, while module capacity measures manufacturing capability rather than rooftop deployment. SEIA figures frequently draw on SEIA/Wood Mackenzie or IREC datasets, so their stated populations and cutoff dates should be retained when comparing them with EIA or IEA measures. Solar Energy Industries Association, “2024 Solar Industry Year in Review Cheat Sheet” Solar Energy Industries Association, “Solar and Storage Industry Research Data”