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U.S. companies that install and finance residential solar have been struggling for years with rising interest rates and unfavorable policy shifts in California, the country’s biggest rooftop solar market. Now, they face an even more serious threat — Republicans in Congress, who have proposed to take away the tax credits that undergird the industry.
These mounting pressures have driven two of the most prominent firms in the U.S. residential solar sector into bankruptcy in recent days.
Residential solar provider Sunnova filed for Chapter 11 bankruptcy protection on Sunday, three months after the publicly traded company warned investors that it could run out of cash due to falling sales, rising operational costs, and a growing debt burden. The Houston-based company, which reported 3 gigawatts of solar and battery systems under management as of the end of 2024, stated on Monday that it “intends to continue operating its business in the ordinary course throughout the sale process.”
Privately held solar lender Solar Mosaic filed for Chapter 11 bankruptcy protection on Friday, stating it has taken action to “reorganize the business to meet its current liquidity needs.” The Oakland, California-based company, which claims it has funded $15 billion in loans to more than 500,000 households, cited “[m]acroeconomic challenges facing the entire residential solar industry, including high interest rates and legislation that threatens to eliminate tax credits for residential solar.”
Those two companies have unique problems that have contributed to their financial collapse, said Joe Osha, an analyst at Guggenheim Securities. “The causes of the difficulties that Mosaic and Sunnova face predate Trump,” he said.
But they also suffered from a market environment that is increasingly difficult and uncertain for every firm in the sector, he said.
The reconciliation bill passed by the House of Representatives last month and now being considered in the Senate would abruptly end a tax-credit regime that’s supported households and solar installers for the past 20 years.
The bill would terminate the 30% tax credit available to households installing solar panels, batteries, inverters, and associated solar equipment at the end of 2025, essentially making those installations about one-third more expensive than they are today.
And the legislation would eliminate the tax credit of 30% or more available to companies that lease solar panels to households and businesses. That would be a blow to firms like Sunnova and Sunrun, the country’s top residential solar company, which have made such third-party ownership structures central to their business models.
All in all, the changes in the House bill could mean U.S. households install 40% less solar over the next five years compared to current policy, according to research firm Wood Mackenzie.
That’s not just a threat to large companies like Sunrun and Tesla, but also to the regional and local businesses that are responsible for a majority of the roughly 5 million rooftop solar systems installed in the U.S. to date — and to a source of zero-carbon energy that stood at more than 50 gigawatts of generation capacity as of 2024.
That bill hasn’t been passed yet, however. Osha warned that it’s too early to extrapolate broader implications for the industry at large from these latest bankruptcies.
That’s because both Mosaic and Sunnova have fallen prey not only to challenging business conditions, but to mistakes in how they’ve reacted to the sector’s ongoing woes, he said.
“The way this business works, at the most basic level, is that you spend money now to create a long stream of contracted cash flows in the future,” Osha said. In the case of solar companies like Sunnova and Mosaic, those cash flows come from households making payments on the loans, leases, or power purchase agreements they’ve signed. The companies bundle those into asset-backed securities for sale to investment banks and other financial firms.
But those securities become far less attractive to buyers when the market for residential solar sours — and in the past year it has soured dramatically. Wood Mackenzie reported a 31% drop in U.S. residential solar installations in 2024 from the prior year.
The Solar Energy Industries Association reported in March that last year’s sales hit a low not seen since 2021. The trade group’s latest data, released this week, shows that “we have now had six consecutive quarters of year-over-year decline in residential solar installations,” Pavel Molchanov, investment strategy analyst at financial services firm Raymond James, pointed out. That includes a 13% year-over-year decline in the first quarter of 2025.
“In any industry, six consecutive down quarters is going to lead to pressure on companies across the board,” he said. “There’s just no escaping that.”
This downturn left Sunnova and Mosaic exposed to a cash crunch, Osha said.
Over the past 18 months or so, Sunnova had chosen to take on large amounts of corporate debt rather than selling off more of its portfolio to raise cash, he explained. As the market turned, finding buyers for those solar-backed assets became harder, making it difficult to raise cash to meet debt payments. The firm listed estimated assets and liabilities of $10 billion to $50 billion and debt of $10.67 billion as of Dec. 31.
Mosaic most likely experienced a similar liquidity crunch as it was unable to sell its portfolios of solar loans at the volume and price required to raise enough capital for new loans, Osha said. In a Monday analyst note, he highlighted that Mosaic had also “failed to make the transition from solar loans to third-party ownership” as interest rates climbed, making loans more expensive options compared to leases or power purchase agreements.
Molchanov emphasized that “financing is at the center of how this industry has historically functioned.” The companies in question built their businesses during the 2010s, when the country had historically low interest rates. But those interest rates have spiked in the past three years in response to the Covid pandemic’s economic disruptions and resulting inflation, driving up the cost of capital for all businesses — including companies borrowing money to install rooftop solar systems.
“There’s a very narrow pathway to navigate when the broader interest rate environment is so difficult,” Molchanov said. “Whatever strategic or tactical mistakes companies made, if we had this conversation five years ago, when interest rates were close to zero, those mistakes would not have been lethal. But now they can be lethal.”
Sunnova is the latest in a string of residential-solar bankruptcies in the past two years, which has included firms from regional installers and financing providers to icons of the industry like SunPower, which collapsed in August 2024. Solar lender Sunlight Financial, which offered lending options similar to those from Mosaic, declared bankruptcy in 2023 and emerged from reorganization later that year.
Filing for bankruptcy protection doesn’t necessarily mean that the companies will cease to exist. Some of SunPower’s business was purchased by Complete Solaria, which has since rebranded under the SunPower name, for example.
Nor does bankruptcy mean that customers will be bereft of customer service support for the solar systems these companies have financed, although that’s certainly a risk, as customers across the country have attested.
It’s also important to distinguish these newly bankrupt companies from others in the space, Osha said. For example, Sunrun, the biggest U.S. residential solar installer with roughly 10% of the market as of 2023, has better managed its way through the market downturn of the past 18 months or so, he said.
“What Sunrun has done in contrast to Sunnova is say, ‘We’re going to sell off those future cash flows to the greatest extent possible, so that we have money today,’” he said.
The House bill’s provision that would cut off tax credits for solar leasing does, however, pose a significant threat to Sunrun’s predominant business model of offering leases and power purchase agreements to residences, Osha said.
The House bill would not cancel tax credits for power purchase agreements, the other primary mechanism for companies that offer third-party-owned solar, Osha said. But in his Monday research note, he opined that this exclusion was “a loophole, not a deliberate plan on the part of legislators,” and that incentives for power purchase agreements would likely suffer the same fate as those for leases and homeowners in a final bill to emerge from Congress.
Whether tax credits expire abruptly at the end of 2025 or there’s an extension beyond that will have a significant impact on the financial viability of large-scale residential solar companies like Sunrun.
“Today, Sunrun’s business model is entirely centered on third-party ownership and tax credits,” he said. “But you can also say that they are a very well-run company that has surely thought about this, and [it] is likely, if the hammer does come down, they have a plan.”
At the same time, thousands of smaller companies that make up the majority of residential solar installations would almost certainly suffer from the tax-credit changes, even if their challenges go less noticed than those of industry stalwarts, said Kristina Costa, former clean energy adviser for the Biden administration.
That would have negative consequences for those working in the industry. Residential solar installation accounted for just over 100,000 jobs in the U.S. at the end of 2023, according to the most recent survey from the Interstate Renewable Energy Council. The current market downturn has already had a negative impact. The California Solar and Storage Association estimated that roughly 17,000 people, or 22% of the state’s distributed solar and storage workforce, lost their jobs between April 2023, when the state reduced incentives for rooftop solar owners, and the end of that year.
“You have a lot of mom-and-pop small business outfits in the solar residential space that are going to be profoundly affected by this bill that’s being debated in Congress right now,” Costa said. “It will be harder and more expensive to install solar and storage in homes — and it may or may not still make sense for somebody to do so, depending on what their state’s energy prices are looking like.”
Given that the House bill is expected to drive up electricity prices already being pushed higher by President Donald Trump’s tariff and energy policies, undermining the economics of rooftop solar “is a pretty direct attack by the House on energy prices in the wrong direction,” Costa said.
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