Why High Interest Rates Are Killing Solar Deals Right Now
High interest rates are killing solar deals because they directly increase the cost of financing, which is how most homeowners and businesses pay for solar systems. When the Federal Reserve raised rates to combat inflation, solar loan rates climbed to a median of 7.5% in the first half of 2025, up significantly from the sub-5% rates seen in 2021. That single change made monthly payments on solar loans substantially higher, pushed payback periods longer, and turned what used to be an easy financial decision into one that no longer pencils out for many households. The result has been a measurable drop in loan demand, a wave of solar company bankruptcies, and a fundamental restructuring of how the industry sells and finances its products.
How Interest Rates Directly Increase the Cost of Solar
The core problem: Most people do not buy solar with cash. They finance it. Whether through a solar-specific loan, a home equity line of credit, or a property assessed clean energy (PACE) program, the cost of borrowing is baked into the total price of the system. When interest rates rise, the total cost of that system rises with them—even if the panels themselves do not get more expensive.
EnergySage’s 21st Solar & Storage Marketplace Report, covering January through June 2025, found that median loan rates climbed to 7.5%. For context, a $28,000 solar loan at 4.99% over 20 years costs about $184 per month. The same loan at 7.5% costs about $225 per month—a difference of nearly $500 per year, or roughly $10,000 over the life of the loan. That is money that does not go toward the system’s actual hardware or installation. It goes to the lender.
The impact is not limited to residential customers. Traditional lenders have been charging commercial solar developers interest rates as high as 18% to offset perceived risks, according to SolaREIT. At those rates, the cost of capital alone can make or break a project’s viability. A report from BofA found that every 100-basis-point increase in interest rates raises the levelized cost of energy (LCOE) for solar by approximately 7%. When U.S. interest rates doubled between 2021 and 2024, the LCOE for solar jumped 18% purely from higher financing costs, while gas plants’ LCOE increased only 9%. Solar is more sensitive to rate changes than fossil fuels because it is more capital-intensive up front and has no fuel costs to offset later.
The Payback Period Problem: When Solar Stops Making Financial Sense
The key point: Solar’s value proposition has always been simple—you pay for the system over time, and eventually your electricity savings exceed what you paid. High interest rates stretch that “eventually” further into the future, sometimes past the point where it makes sense for the homeowner.
In Brazil, where the Selic rate ranged between 12.25% and 15% annually in the first half of 2025, research found that the payback period for solar investments had roughly doubled over three years. A system that might have paid for itself in five or six years now takes ten or twelve. In some cases, the math simply stops working. A study published in 2025 found that higher interest rates extend payback periods from 5.26 years to 5.70 years, making the project “less appealing because it takes longer to recoup the investment”.
For homeowners, the decision is not abstract. They compare the monthly loan payment to their current electricity bill. If the loan payment is higher than the bill, the deal does not make sense—regardless of the long-term environmental or financial benefits. With median loan rates at 7.5% and rising equipment costs from tariffs, that comparison has become less favorable for a growing share of the market.
| Factor | Low-Rate Environment (2021) | High-Rate Environment (2025) |
|---|---|---|
| Median Solar Loan Rate | ~4%–5% | 7.5% |
| Monthly Payment on $28,000 / 20 Years | ~$170–$184 | ~$225 |
| Typical Payback Period | 5–7 years | 8–12+ years |
| Loan Demand Trend | Strong growth | 38% of contractors report decreased demand |
Sources: EnergySage H1 2025 report; SurgePV financing guide; payback period data from industry studies
The Shift to Leases and PPAs: A Response to High Rates
When loans become expensive, customers do not simply stop wanting solar. They look for alternatives. EnergySage’s report found that while 38% of contractors reported decreased loan demand, demand for solar overall did not disappear—it shifted. The beneficiaries have been third-party ownership models: leases and power purchase agreements (PPAs).
In a lease or PPA, the customer does not own the system and does not take out a loan. Instead, a third-party company owns the panels and sells the electricity to the homeowner at a rate that is typically 20–40% below utility pricing from day one. Because the third party is responsible for financing the system, the homeowner is insulated from the interest rate environment. This model was already growing before rates spiked, but high rates have accelerated the shift. One industry report noted that “a rise in third-party-owned systems like leases and power purchase agreements emerged in response to worsened loan terms in our current higher-for-longer interest rate environment”.
The One Big Beautiful Bill Act, which eliminated the federal 30% investment tax credit for homeowners who purchase systems outright, has made the shift even more pronounced. The legislation preserved tax credits for third-party ownership longer than for purchased systems, positioning leases and PPAs for significant growth in 2026. For homeowners who cannot afford a cash purchase and do not want to take on a high-interest loan, leasing has become the default path to solar—even though it means giving up ownership and the long-term savings that come with it.
The Wave of Solar Bankruptcies: What Happened to the Industry
The scale of the damage: Roughly 100 U.S. solar companies have filed for bankruptcy protection since 2023, according to Harvard Business School’s Institute for Business in Global Society. The failures are not concentrated among small installers. They include some of the largest names in solar financing.
Mosaic, one of the nation’s largest providers of residential solar loans, filed for Chapter 11 bankruptcy in June 2025, citing “macroeconomic challenges facing the residential solar industry” and the pressure of high interest rates. Sunnova, another major player, was burdened with over $10.6 billion in debt by the end of 2024 and cited high interest rates, declining sales, and debt service costs as key reasons for its insolvency. The company had secured a $185 million term loan at a 15% interest rate just months before, adding to its debt burden. The Department of Energy also canceled a $2.92 billion loan guarantee to Sunnova for a project intended to provide solar loans to low-income households, with the company acknowledging that demand had decreased.
Christian Kaps, an assistant professor at Harvard Business School, explained the deeper issue: “In a world of high interest rates and low government support, solar has become a much lower-margin investment for households. Companies need to reduce their own cost of installation and maintenance, and those unable to do so will leave the market”. The residential solar industry, after a decade of rapid growth fueled by cheap capital and generous incentives, is reverting to its natural base: wealthier homeowners who can afford to pay cash or absorb higher loan payments. The mass-market adoption that the industry promised has stalled.
What This Means for Homeowners and Businesses Right Now
If you are considering solar today, the financial calculation is different from what it was three years ago. Here is what you need to understand:
- Cash is king. If you can pay for a system outright, you avoid the interest rate problem entirely. Installers reported that 94% saw cash buyers increase or remain stable in H1 2025. The 30% federal tax credit for purchased systems is being phased out, so acting before it disappears may still make cash purchases attractive for those who can afford them.
- Loan rates vary widely. The median rate is 7.5%, but borrowers with excellent credit (720+) may qualify for rates as low as 3.99%–5.99% in 2026, according to SurgePV’s financing guide. Your credit score matters more than ever.
- Leases and PPAs are worth serious consideration. If you cannot pay cash and do not want a high-interest loan, a lease or PPA may still allow you to go solar. You will not own the system, and you may not increase your home’s value as much, but you can start saving on electricity immediately.
- Payback periods are longer. Expect 8–12 years instead of 5–7. If you plan to move within five years, solar may not be the right financial decision regardless of how you finance it.
- Battery costs are rising too. Tariffs on Chinese battery components caused storage prices to increase by 4% in H1 2025, the first increase after two years of declines. If you are considering solar-plus-storage, factor that into your budget.
What Needs to Happen for Solar Deals to Recover
The solar industry’s recovery depends on two things: lower interest rates and lower installation costs. Neither is guaranteed, and both are outside the control of most homeowners and businesses.
On rates, the Federal Reserve cut its benchmark rate for the first time in 2025, bringing it to 4%–4.25%. Forecasts for 2026 suggest further moderation, with some analysts projecting the effective federal funds rate could fall to around 2.81%. If that happens, solar loan rates should decline, and monthly payments will become more manageable. SurgePV’s 2026 financing guide projects loan rates ranging from 3.99% to 7.49%, which is meaningfully better than the peak-rate environment of 2024.
On costs, installers are under pressure to reduce their own expenses. Labor rates have risen, and 79% of installers are heavily dependent on solar-related revenue, making it difficult for them to absorb further margin compression. Some companies are exploring creative financing solutions, such as land-based capital approaches that unlock cash earlier in the project lifecycle, but these are mostly relevant to commercial developers, not homeowners.
The industry’s long-term trajectory still points toward growth. Solar installations hit 5 million in the U.S., and solar generation reached 300,000 gigawatt-hours in 2024, up from less than 50,000 a decade earlier. The demand for clean, cheap electricity has not gone away. But the business model that relied on cheap capital and generous subsidies is gone, and the companies that survive will be those that adapt to a world where solar has to compete on its own financial merits.
Frequently Asked Questions
Why did solar loan rates go up so much?
Solar loan rates are tied to broader interest rates set by the Federal Reserve. When the Fed raised rates to fight inflation, the cost of borrowing increased across the economy, including for solar loans. Median solar loan rates climbed to 7.5% in H1 2025, up from below 5% in 2021.
Is solar still worth it with high interest rates?
It depends on how you pay. If you can pay cash or qualify for a low-rate loan (below 5%), solar can still be a strong investment. If you need a high-rate loan, the payback period may stretch to 10–12 years, and a lease or PPA may be a better option. The key is to compare the monthly payment to your current electricity bill and consider how long you plan to stay in your home.
What happened to all the solar companies that went bankrupt?
Roughly 100 U.S. solar companies filed for bankruptcy since 2023, including major lenders like Mosaic and Sunnova. High interest rates increased their borrowing costs, reduced customer demand for loans, and exposed a business model that depended on cheap capital and rapid growth.
Will solar become cheaper again?
Solar equipment prices are unlikely to fall significantly, especially with tariffs on imported components. However, financing costs may decline if the Federal Reserve continues to cut rates. Forecasts for 2026 suggest loan rates could return to the 4%–7% range, which would improve the economics for borrowers. Installation costs also need to come down for solar to reach the mass market again.
Should I lease instead of buying solar right now?
If you cannot pay cash and do not qualify for a low-rate loan, a lease or PPA is worth considering. You will not own the system and may not capture the full long-term savings, but you can start saving on electricity immediately without taking on high-interest debt. Just read the contract carefully, especially the terms for transferring the lease if you sell your home.
The Bottom Line
High interest rates have not killed the demand for solar, but they have killed the easy deal. The era when a homeowner could sign a zero-down loan at 3% and immediately save money is over. What remains is a more honest market: solar still works financially for people who can pay cash, qualify for low rates, or accept the trade-offs of a lease. For everyone else, the math has gotten harder, and the industry is still adjusting to that reality.
If you are considering solar, the most important step you can take is to get quotes for cash, loan, and lease options side by side, and compare the actual system prices rather than just the monthly payments. The right choice depends on your credit, your tax situation, and how long you plan to stay in your home. There is no single answer that works for everyone.