Different companies, different business models, same ending: bankruptcy court, asset sales, and hundreds of dealers and installers left scrambling to get paid for work they'd already completed.
That's not a coincidence. It's a business model problem.
Two June filings, 48 hours apart, tell the real story. Mosaic wasn't an installer — it was the financing layer, backing home solar loans for over 500,000 households. Sunnova was the installer and lessor. Together, they represented both major ways homeowners paid for solar: loans and leases/PPAs. When the lender and one of the largest lessors both hit bankruptcy court in the same week, it wasn't a company-specific failure. It was the financing model underneath the entire industry breaking at the same time.
The model that built the industry is the same one that's breaking it.
Third-party-ownership (TPO) — leases and power purchase agreements that let homeowners go solar with little or no money down — along with solar loans like Mosaic's, is what made residential solar scale over the last decade. It works by having the installer, lessor, or lender carry the cost of the system upfront, then collect payments over 20-25 years as the homeowner "pays for" the energy produced.
That model runs entirely on cheap capital. As long as interest rates stay low and investors keep funding the paper, the math works. The moment borrowing costs spike, the model gets squeezed from both directions: financing new systems gets more expensive, and the long-dated receivables on the books are worth less to lenders and investors evaluating the company's balance sheet. Mosaic cited exactly this — rising rates, a fragmented capital market, and legislative uncertainty around solar tax credits — as the reason it couldn't raise the capital it needed, despite bringing in outside advisors more than a year before its filing.
Add policy risk on top of that. Sunnova had already built its business partly around a federal loan guarantee — the single largest DOE commitment ever made to solar — before that guarantee was pulled by a change in administration. California's net metering changes (NEM 3.0) gutted the economics of new installs in one of the largest solar markets in the country. Legislation rolling back residential solar tax credits (48E and 25D) added yet another layer of uncertainty right as both companies were trying to raise capital. When your revenue model depends on cheap capital and a stable policy environment, you're exposed on two fronts at once, and 2024-2025 hit both simultaneously.
The dealer and installer network absorbs the shock first. Sunnova and PosiGen didn't manufacture panels or do all the installs themselves — they worked through networks of independent dealer-installers who signed homeowners, did the physical work, and got paid by the installer/financier after the fact. When the installer runs out of cash, dealers are the ones holding unpaid invoices for completed jobs, with little leverage and often no idea their exposure is coming until the bankruptcy filing hits the news.
I've watched this play out from the dealer side, more than once. The pattern is always the same: warning signs show up in SEC filings and executive departures months before anyone in the field hears about it, then it's mass layoffs, then the Chapter 11 filing, then a fire-sale of assets to a bondholder- or lender-backed buyer for a fraction of what the company was worth a year earlier. Sunnova's assets sold for about $118 million against $13.4 billion in reported assets the year before. Mosaic's $8 billion loan portfolio ended up serviced by a subsidiary of its own secured lender. That's the gap between a going concern and a wind-down.
What this means if you're a dealer, installer, or anyone extending credit in this space:
- Don't treat "second-largest in the industry" as a proxy for financial stability — size didn't save Sunnova, and scale didn't save Mosaic.
- Watch the leading indicators: going-concern warnings, executive resignations, workforce reductions, outside restructuring advisors. They show up before the filing, not after.
- Understand your legal position before you need it. Liens, UCC filings, and proof-of-claim procedures aren't paperwork you deal with after a bankruptcy — they're protection you should already have in place.
The solar industry isn't going away. But the TPO-heavy, loan-heavy, cheap-capital growth model that built the last decade is running into a rate and policy environment it wasn't built for. When your lender and your lessor file bankruptcy in the same week, that's not bad luck — that's a business model reaching the end of what cheap money could paper over. More consolidation and more bankruptcies are a reasonable bet — not because solar doesn't work, but because too many of these companies were financed like it was still 2021.
Been affected by one of these bankruptcies, or want to talk through how to protect your position? Reach out.
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