PPA Loan vs Solar Lease vs Cash: 2026 California Comparison

There are four practical ways to pay for rooftop solar in California in 2026: cash purchase, solar loan, solar lease, or a power purchase agreement (PPA). Each looks different on the kitchen table and each hits your monthly budget differently over 20-25 years. The wrong choice costs tens of thousands of dollars over the life of the system. This guide walks through each option, runs the math for a typical California household, and tells you honestly which one tends to fit which kind of buyer.

The Quick Summary

Cash — lowest lifetime cost, highest upfront cost. You own the system. Best if you have $20K-$40K sitting in savings earning less than the opportunity cost of putting it into solar.

Solar loan — you own the system, the lender owns the debt. Best if you have strong credit (680+) and want ownership without the upfront capital outlay. Watch for dealer fees baked into the financed amount and escalating interest rates.

Solar lease — the installer owns the system and rents it to you at a fixed monthly rate with an annual escalator (typically 1-3.9%). No upfront cost. Maintenance and warranty covered. You don't claim the federal tax credit.

Solar PPA (power purchase agreement) — the installer owns the system and sells you the electricity it produces at a fixed per-kWh rate (usually below your utility's retail rate) with an annual escalator. No upfront cost. Similar economics to a lease but priced per kWh rather than flat. You don't claim the federal tax credit.

Cash Purchase: The Lowest Lifetime Cost Option

Buying solar with cash means writing a check for the full system cost at the beginning and owning everything outright from day one. A typical 7 kW system with battery in California runs roughly $22,000 to $35,000 installed in 2026 depending on panel brand, battery choice, and installer. You claim the federal solar tax credit (30% through end of 2025; varies in 2026+), you get 100% of the production savings, and the system is an owned asset on your home that can convey to a future buyer.

The payback math is straightforward. If your current utility bill averages $250 per month and solar with battery knocks it down to $70 per month, you're saving $180 per month or $2,160 per year. On a $28,000 cash purchase, net of a $8,400 tax credit, your effective cost is $19,600 and your simple payback is about 9 years. Everything after year 9 is pure savings. Over 25 years the total lifetime savings comes out to roughly $35,000-$50,000 depending on utility rate inflation.

Cash is the right choice if you have the capital available and don't need that money for higher-return investments. If your savings are earning 4% in a money market fund and solar saves you effectively 10%+ on an annualized basis, cash solar is a better return than the savings account.

Solar Loan: You Own, The Bank Finances

A solar loan lets you buy the system with financing rather than cash. You still own the system and still claim the tax credit, but instead of paying $28,000 upfront you make a fixed monthly loan payment for 10, 15, 20, or 25 years. Common solar loan products in California come from GoodLeap, Sunlight Financial, Dividend Finance, Mosaic, and others. Interest rates in 2026 run roughly 6% to 10% depending on credit score, loan term, and lender.

The key thing to understand about solar loans is the difference between cash price and loan price. Most solar loans are structured so the installer pays the lender a dealer fee (often 15% to 25% of the system cost) that gets baked into the financed amount. The $28,000 cash price becomes a $35,000 financed amount. That's why loan proposals are always higher than cash proposals for the same equipment. When comparing installers, always ask for both the cash price and the financed price so you can see the dealer fee directly.

Loans work well for California homeowners with strong credit (680+ FICO typically), stable income, and the discipline to treat the loan payment as a utility replacement rather than adding to total monthly outlay. The monthly math often works: if your loan payment is $200 and the remaining utility bill is $80, your combined $280 monthly solar cost compares favorably to your pre-solar $250 utility bill when you factor in 6-12% annual utility rate inflation locking you in forever.

Solar Lease: Installer Owns, You Rent

In a solar lease, the installer (or a third-party leasing company like Sunnova, now under SunStrong Management, or Sunrun's lease product) owns the system on your roof and rents it to you at a fixed monthly rate for 20 to 25 years. The rate typically includes an annual escalator between 1% and 3.9%. You pay the monthly lease regardless of how much the system produces.

The major trade-offs: you don't own the system (the lessor does), you don't claim the federal tax credit (the lessor does), and you may be responsible for lease payments even in months with low production. In exchange, you don't put any cash down, maintenance and warranty are handled by the lessor, and the monthly math usually beats the utility bill.

Leases are underrated for two specific groups: retirees on fixed income who can't finance a loan (income qualification may be difficult) and homeowners who expect to move within 10 years. The lease transfers with the home sale if the buyer qualifies and agrees — which adds a step to the sales process but is usually workable.

Solar PPA: The California-Specific Lead

A PPA is structurally similar to a lease but priced per kWh rather than as a flat monthly payment. The installer owns the system and sells you the electricity it produces at a contracted per-kWh rate, typically 5 to 15 cents per kWh in California depending on the specific deal. When the system produces 800 kWh in a month you pay for 800 kWh. When it produces 400 kWh you pay for 400 kWh. Any electricity you still need from the grid, you buy at the utility's rate.

PPAs have an annual escalator like leases (often 2.9% to 3.9%), so the per-kWh rate goes up year over year. The key advantage in California under NEM 3.0 is that a PPA lets you get the benefit of solar with no upfront cost and no debt obligation. You're just swapping one utility-style bill for another, cheaper utility-style bill.

The California Rate Relief Program is specifically a PPA product — it lets qualifying California homeowners swap their high utility rate for a fixed, lower solar rate with $0 down. Read more about how PPAs specifically work on our prepaid PPA guide for the specific mechanics.

Side-by-Side: $250/mo California Bill Example

Let's run the math for a typical California household with a $250 monthly bill (average 900 kWh/month). System size: 7 kW with a 10-13 kWh battery. Location: Riverside, CA on SCE. Assumes 6% annual utility rate inflation.

Cash wins on lifetime cost by a significant margin. Loan is second if you have the credit. Lease and PPA are roughly tied and both beat doing nothing by $34K-$37K over 25 years. Numbers vary widely with your specific utility (SDG&E customers save more, LADWP customers save less), roof conditions, and rate inflation assumptions, but the rank order tends to hold.

Which Option Fits Which Buyer?

Cash fits homeowners with $25K-$40K available and no higher-return use for it. Gets the best ROI. No lease transfer awkwardness if you sell.

Loan fits creditworthy homeowners (680+ FICO) who want ownership but don't want to deplete savings. Watch the dealer fee — insist on cash price comparison.

Lease fits homeowners who don't qualify for loan financing (income too low, self-employed, credit under 650), don't want to pay upfront, and are staying in their home for at least 7-10 years. The lease is transferable if you sell earlier.

PPA fits California homeowners specifically — it's the most common product from large California installers, it has the simplest monthly math (utility-like bill), and under NEM 3.0 the economics still work with battery storage included.

Red Flags To Watch For

Escalators above 3%. Annual rate escalators of 2.9% or less are standard. 3.9% is on the high end. Anything 4%+ is worth pushing back on.

Loan proposals without a cash price. If the installer only quotes you a financed monthly payment and won't show you the cash equivalent, there's dealer fee being hidden.

Prepaid PPAs sold as "free solar." A prepaid PPA is actually cash-upfront for 20-25 years of production — a perfectly legitimate product, but it's not free. If someone pitches it as "free solar," that's a misleading sales tactic.

Production guarantees without teeth. Every lease and PPA should have a 90%+ production guarantee where the installer makes up the shortfall if the system under-produces. Confirm it's in writing.

Contracts with installers in Chapter 11 or recently restructured. As of 2026 that includes Freedom Forever and Sunnova (now SunStrong). A 25-year warranty is only as good as the company behind it.

What To Do Next

The best next step is to see real numbers for your specific address, utility, and usage — then compare financing options against each other with that specific system as the baseline. The math changes meaningfully with every variable.