The Biggest Home Solar Companies in the U.S., by Installations

Most “top solar companies” lists are ranked by who pays for placement. This one is ranked by how many home solar systems each company actually installed, according to public installation records. It is also a record of how unstable the industry is: five of the 20 biggest installers of 2023–2025 have already closed or gone bankrupt.

Where the numbers come from

Utilities and state agencies record every solar system connected to the grid, and in about a dozen states those records name the installer. Lawrence Berkeley National Laboratory compiles them in Tracking the Sun; New York and New Jersey also publish their own program records. Together, they include 821,195 home solar systems installed in 2023–2025 with a named installer, in California, Arizona, New York, New Jersey, New Mexico, Wisconsin, Vermont, New Hampshire, Rhode Island, Oregon, part of Massachusetts and Connecticut (whose records thin out after 2022), part of Texas and part of Florida. Arizona, Texas and Florida records for 2025 are still incomplete.

That covers the largest home solar markets, starting with California, but not all of the country. Companies that sell mainly in Florida, Nevada, Colorado, Illinois or most of Texas are underrepresented because the records there don’t name installers.

The 20 biggest home solar installers, 2023–2025

“States” counts the states in the records where the company installed systems. Prices are medians for systems the homeowner bought outright, before incentives; leased systems don’t report a comparable price. Status reflects news reports through September 2026. Names are as the companies appear in the records, standardized; each linked profile shows the company’s full installation record.

Who leads in each state

The national list hides how different each state’s market is. The installer with the most home systems in each state with at least 1,500 named systems, in the state’s latest three years of records:

Arizona, Texas, New Mexico and Florida use 2022–2024, because their 2025 records are incomplete; New Hampshire’s latest records are from 2021–2023.

Two patterns stand out. In the Northeast, Sunrun dominates. In smaller markets such as New Mexico, Wisconsin and New Hampshire, a regional company leads with a quarter or more of the market, and the national brands barely register. And in Arizona, two of the top three installers of 2022–2024 no longer exist, which is why so many Arizona homeowners now need a new company to service their systems.

How the top five changed

The biggest installers by year, in the same records:

Sunrun has been number one every year since 2018. Tesla, which led in 2016 and 2017 as SolarCity, installs fewer systems than it did then but has stayed in the top four, and was back in second place in 2025. Of the other companies that reached the top five in these years, Sungevity, PetersenDean, Titan Solar, SunPower and Freedom Forever all went bankrupt or closed. Rapid growth has not been a sign of staying power in this industry.

What the list shows

One company is far ahead

Sunrun installed about 18% of all home systems with a named installer, three times as many as the next company. It is also the clearest example of the leasing model: more than eight in ten Sunrun systems were leased or sold under a power purchase agreement, so the homeowner pays monthly and Sunrun owns the panels. In our city rankings it is number one in 86 of the 123 cities we rank; Our World Energy is next, first in 6.

Five of the 20 biggest names are gone

SunPower, Freedom Forever, Sunnova, Infinity Energy and Titan Solar together installed about 104,000 home systems in these three years alone. All five have since closed or gone through bankruptcy. Size was no protection: all five went under after the market slowed, when interest rates rose and California cut payments for exported solar power in April 2023. If one of them installed your system, see what to do when a solar company goes out of business.

Two business models

The list splits almost evenly between companies that mostly lease (Sunrun, Bright Planet Solar, Trinity Solar, Momentum Solar, V3 Electric, SunnyMac, Sunnova) and companies that mostly sell systems you own (Tesla, Semper Solaris, Baker Electric, Citadel, Powur, Empower Electric). The difference matters more than the brand. With a lease you pay little upfront but don’t own the system, and the savings over the contract are usually smaller. Our lease vs. buy guide walks through the numbers.

Big doesn’t mean cheap

Among these 20 companies, the median price of a purchased system ranged from $2.65 per watt (Citadel Roofing & Solar) to $6.06 per watt (Empower Electric), more than double. Tesla came in at $4.18, close to the market median of $4.25, now that most of its systems include a Powerwall. Several of the fastest-growing national sellers were among the most expensive.

For a 7 kW system, the gap between $3.50 and $5.00 per watt is more than $10,000.

Most of the biggest installers work in one state

Eight of the 20 installed in only one or two states, mostly California. In your city, the best-known national brand may not be the most active installer. Our city rankings show who installs the most where you live.

How to use this list

A high installation count shows a company has done a lot of work and knows how to get systems permitted and connected. It says nothing about workmanship or how the company treats customers after the sale. Before signing with any installer, large or small:

1. Compare the price per watt with the median for your city.
2. Ask how long the company has been installing in your area and check that it still appears in recent records.
3. Get the workmanship warranty in writing, including roof penetrations, and ask what happens to it if the company is sold or closes.
4. Check the contractor license with your state board, and read recent reviews.
5. Get at least three quotes, including one from a local installer.

Sources

• Lawrence Berkeley National Laboratory, Tracking the Sun, 2026 edition, records through 2025 (CC BY 4.0).
• NYSERDA, Solar Electric Programs Reported by NYSERDA; New Jersey’s Clean Energy Program, solar activity reports.
• Home systems on existing homes, installed 2023–2025, excluding self-installed and new-construction systems. Company names standardized and counts by Solar Power Fix. Closures: see our list of solar companies that went out of business.