US Solar Industry Overview

Market Scale and Growth

The United States solar industry has grown from a niche technology into one of the country's largest sources of new electricity generation. By 2024, the US had surpassed 200 gigawatts (GW) of installed solar capacity — enough to power tens of millions of homes. The Solar Energy Industries Association (SEIA) projects that solar will account for roughly half of all new electric generating capacity added through 2030, driven by falling module prices, the Inflation Reduction Act (IRA) tax credits, and corporate renewable procurement commitments.

The utility-scale segment — projects of 1 MW and larger — accounts for the majority of installed capacity, but distributed solar (rooftop and community solar) is growing rapidly as net metering policies, battery storage, and financing options improve. Together, these segments support hundreds of thousands of jobs across manufacturing, installation, development, and operations.

Module prices have fallen more than 90% over the past fifteen years, making solar cost-competitive with new natural gas plants across most of the country. The levelized cost of energy (LCOE) for utility solar now sits well below $40/MWh in the best resource regions, and residential solar payback periods in high-cost electricity states are often under seven years.

Key Industry Segments

The US solar supply chain spans several distinct segments, each with its own geography, economics, and competitive dynamics:

Module Manufacturers

Photovoltaic module manufacturing is heavily concentrated in Asia, but IRA domestic content bonuses are spurring a wave of US factory investments. First Solar operates large thin-film factories in Ohio and is expanding into Alabama and Louisiana. New entrants from South Korea, China, and India are building gigawatt-scale plants in the Southeast and Midwest to qualify for the 10-cent-per-watt manufacturing tax credit introduced by the IRA. Crystalline silicon cells and wafers are also beginning to be produced domestically after a multi-decade absence.

EPC Contractors and Developers

Engineering, Procurement, and Construction (EPC) firms design and build solar projects, often for independent power producers (IPPs) or utilities. Large-scale developers like NextEra Energy Resources, Ørsted, and Lightsource BP manage projects from site selection through permitting, interconnection, and construction. Development timelines for utility projects have stretched to five to seven years in congested interconnection queues, particularly in PJM and MISO territories.

Residential and Commercial Installers

Rooftop solar is installed primarily by local and regional contractors, though national firms like Sunrun, SunPower, and Tesla Energy have significant market share. Installer density tracks closely with electricity prices, solar irradiance, and state policy — California, Florida, and Texas are the largest installer markets by volume. Browse all solar installers by state in the Bywatts database.

Balance-of-System and Services

Inverters, racking, wiring, monitoring software, and O&M services make up a significant share of project cost. US-based companies including Enphase, SolarEdge, and Array Technologies supply key components, while a growing ecosystem of software firms handles performance monitoring, asset management, and energy trading.

Where Solar Companies Cluster

Solar industry activity — from corporate headquarters to regional offices and project development pipelines — concentrates in a handful of states that combine strong policy, high electricity prices, abundant land or rooftops, and skilled workforces.

• California — home to more solar companies than any other state, spanning manufacturers, developers, installers, software firms, and financiers. California's Renewable Portfolio Standard (100% clean electricity by 2045) and the highest average electricity prices in the continental US make it the single most active solar market.
• Texas — the leading state for new utility-scale solar and battery storage, driven by the deregulated ERCOT market, flat land with excellent solar resource, and a fast-growing population. Houston and Austin host large developer and EPC offices.
• Florida — a rapidly growing residential and utility solar market, with major utilities (FPL, Duke Energy Florida) deploying multi-gigawatt solar programs.
• New York — strong policy (Climate Leadership and Community Protection Act) and competitive electricity prices drive a large installer and developer community despite a shorter solar season than Sun Belt states.
• Arizona — one of the best solar resources in the world, anchoring large utility and commercial projects and attracting manufacturing investment.

Browse the full solar companies directory by state to explore the database for your region.

How Solar Connects to the Power Grid

Solar generation does not operate in isolation — it feeds into a complex grid infrastructure of transmission lines, substations, and wholesale markets that moves electricity from where it is produced to where it is consumed. Understanding grid interconnection is critical for developers, investors, and policymakers alike.

Large utility-scale solar projects connect at the transmission level (typically 115 kV to 500 kV), requiring an interconnection study and queue process that can take three to five years in congested regions. The Federal Energy Regulatory Commission (FERC) Order 2023 introduced significant reforms to the interconnection process in 2023, attempting to clear a backlog of over 2,000 GW of projects waiting in queues nationwide.

Distributed solar connects at the distribution level (12 kV or 25 kV feeders), typically requiring a simpler interconnection study under utility tariffs. However, high penetration of rooftop solar on certain feeders is forcing utilities to invest in grid upgrades, smart inverter standards, and dynamic export limits to maintain power quality.

Explore power plants in California or power plants in Texas to see how solar capacity compares to other fuel types in these leading states. The interactive map overlays solar companies, installers, and power plants on a single view of US energy infrastructure.

Energy storage is increasingly co-located with solar to smooth output variability and shift generation to evening peak periods. See the companion Guide to Energy Storage for a deep dive into storage technologies, providers, and grid integration.