How Power Purchase Agreements Work as a Payment Plan
What a Power Purchase Agreement Actually Is
A Power Purchase Agreement (PPA) is a contract between you and a solar company where the company installs panels on your roof at no upfront cost, and you agree to buy the electricity those panels produce at a fixed rate per kilowatt-hour. You do not own the panels—the solar company does. Instead of paying to buy and install solar yourself, you pay for the power it generates, usually at a rate lower than your current utility bill.
This is different from a traditional loan or payment plan. You are not financing the purchase of equipment. You are entering a long-term contract to buy power. The solar company owns the equipment, handles maintenance, and keeps any tax credits or rebates. You get lower electricity costs and a predictable monthly bill.
PPAs typically run 20 to 25 years. Your rate per kilowatt-hour is locked in at signing, though most contracts include a small annual increase (often 0 to 3 percent per year). After the contract ends, you can remove the panels, buy them, or renegotiate with the company.
Key Takeaways
- A PPA means the solar company owns the panels and you buy the electricity they produce at a fixed rate, with no money down.
- Your monthly bill replaces part or all of your utility bill, depending on how much power the panels generate and how much you use.
- The solar company handles all maintenance, repairs, and equipment replacement during the contract term.
- You do not own the panels, so you cannot claim federal tax credits, state rebates, or depreciation deductions—the company does.
- If you sell your home, the PPA transfers to the new owner, or you may need to pay a buyout fee to end the contract early.
How Your Monthly Bill Works Under a PPA
Instead of a traditional utility bill, you receive a bill from the solar company for the kilowatt-hours your panels produced that month. If your panels generated 600 kilowatt-hours and your rate is $0.12 per kilowatt-hour, your bill is $72 for that month. This amount is separate from any remaining utility charges if your home uses more power than the panels produce.
Most homes do not generate 100 percent of their electricity from solar. On cloudy days or at night, you still draw power from the grid and pay your utility company for that portion. Your total electricity cost is the PPA bill plus the utility bill for grid power. In a good month with lots of sun, the PPA bill might be your only electricity charge. In a winter month, you may pay both the PPA and a utility bill.
The rate you lock in at signing does not change based on utility rate increases. If your utility company raises rates 5 percent per year, your PPA rate stays the same (except for the small annual escalator built into your contract). This predictability is one reason people choose PPAs—they know their solar portion of the bill will not spike.
What the Solar Company Covers and What You Pay For
The solar company owns the panels and is responsible for all maintenance, repairs, and replacement during the contract term. If a panel fails, they replace it at no cost to you. If the inverter (the device that converts DC power to AC power) breaks, they fix it. If the system needs cleaning or monitoring, that is their responsibility. You do not pay for any of this separately.
You are responsible for the roof itself. If your roof needs replacement during the PPA term, you typically have to pay for that work, and the solar company will remove and reinstall the panels. This can be expensive, so it is worth asking the solar company about roof condition before signing. Some companies will not install on roofs older than a certain age.
You also remain responsible for your homeowner's insurance and property taxes. The panels may slightly increase your home's assessed value, which could affect property taxes depending on your state and local rules. Check with your local assessor before signing.
Tax Credits, Rebates, and Who Gets Them
When you own solar panels outright or finance them with a loan, you can claim the federal Investment Tax Credit (ITC), which currently allows you to deduct 30 percent of the installation cost from your federal income taxes. You may also be may be able to access for state rebates, utility company incentives, or performance-based payments. Under a PPA, the solar company claims all of these benefits, not you.
This is a significant financial trade-off. The solar company factors the tax credit into their pricing, so your rate per kilowatt-hour is lower than it would be if you owned the system. But you never see the tax credit yourself. If tax credits or rebates are important to your financial picture, a PPA may not be the best choice—a loan or cash purchase would let you keep those benefits.
What Happens If You Move or Sell Your Home
A PPA is tied to the property, not to you personally. If you sell your home, the contract transfers to the new owner. The new owner takes over your payments and gets the benefit of the locked-in rate. This can make your home more attractive to buyers, especially in areas where solar is popular and electricity rates are high.
However, not all buyers want to take on a PPA. Some prefer to own their solar system or avoid long-term contracts. If a buyer refuses to assume the PPA, you may have to pay a buyout fee to end the contract early. This fee varies widely—it could be a few thousand dollars or tens of thousands, depending on how much of the contract remains and the company's terms. Always review the buyout clause before signing.
If you rent out your home instead of selling, the tenant pays the PPA bill as part of their rent or utilities. Make sure your lease clearly states who is responsible for the solar bill to avoid disputes.
Comparing PPAs to Loans, Cash Purchase, and Leases
| Option | Upfront Cost | Who Owns Panels | Tax Credits | Maintenance | Contract Length |
|---|---|---|---|---|---|
| PPA | $0 | Solar company | Solar company keeps them | Solar company | 20–25 years |
| Solar Loan | $0–20% down | You (after loan paid off) | You claim them | You pay for repairs | 5–20 years (loan term) |
| Cash Purchase | $15,000–$25,000+ | You immediately | You claim them | You pay for repairs | None (you own it) |
| Solar Lease | $0 | Leasing company | Leasing company keeps them | Leasing company | 20–25 years |
A PPA and a solar lease are similar—both have zero upfront cost and the company handles maintenance. The main difference is how you pay. With a lease, you pay a fixed monthly fee regardless of how much power the panels produce. With a PPA, you pay per kilowatt-hour, so your bill varies with production. In a sunny month, a PPA may cost less; in a cloudy month, it may cost more.
A solar loan lets you own the panels and claim tax credits, but you pay upfront (or finance it) and handle maintenance costs. A cash purchase has the highest upfront cost but no monthly payments after the system is paid for, and you own it outright.
Questions to Ask Before Signing a PPA
Before you commit to a 20-year contract, clarify these points with the solar company in writing:
- What is the rate per kilowatt-hour, and what is the annual escalator? Make sure you understand how your bill will grow each year.
- What happens if the system underperforms? Some PPAs include a performance may provide; others do not. If the panels produce less power than expected, are you still obligated to pay the full bill?
- What is the buyout fee if you want to end the contract early? Get this in writing and understand how it is calculated.
- What is covered under maintenance, and what is not? Ask specifically about roof work, inverter replacement, and panel cleaning.
- Can you add more panels later, or upgrade the system? Some contracts allow it; others do not.
- What happens at the end of the 20-year term? Can you renew, buy the panels, or have them removed?
Frequently Asked Questions
Can I get out of a PPA if I change my mind?
Most PPAs allow you to end the contract early, but you will owe a buyout fee. This fee is usually substantial because the solar company is counting on 20 years of payments to recoup their investment. Read your contract carefully to understand the exact buyout terms and how the fee is calculated.
Does a PPA hurt my credit score?
A PPA is not a loan, so it does not appear on your credit report as debt. However, if you fail to pay your PPA bill, the solar company can report it to credit bureaus just like any other unpaid bill. Pay on time and your credit is unaffected.
What if my roof needs replacement during the PPA?
You are responsible for roof replacement costs. The solar company will remove the panels before the work and reinstall them after. This can add $1,000 to $3,000 to your roof project, depending on system size and local labor costs. If your roof is aging, consider replacing it before signing a PPA.
Can I install a battery with a PPA?
Some solar companies offer battery storage as an add-on to a PPA, but it is not standard. If you want a battery, ask whether the company offers it and whether it is included in the PPA or billed separately. Battery costs and terms vary widely.
What if I do not use all the power my panels produce?
Most utilities allow you to send excess power back to the grid through a process called net metering. You receive a credit on your utility bill for that power. However, net metering rules vary by state and utility, so check your local rules before signing a PPA. Some areas do not offer net metering, which means excess power is simply lost.