What Does Solar Cost Per Month, and How Much Does It Save?

Most people ask what solar costs and picture one big number. For most homeowners, though, solar is a monthly payment, and the question that matters is how that payment compares with the electric bill you already pay.

This article covers what you'd pay each month with each way to pay, what goes into your real monthly cost, and how much solar saves per month. For the full picture on price, incentives and payback, see our guide to solar cost and savings.

What does solar cost per month?

For most homes, a solar payment costs less each month than the electric bill it replaces. Across Evergreen Solar customers, savings average about 15% on day one. You aren't adding a new bill on top of your old one. You're swapping most of a utility bill that keeps rising for a solar payment that stays predictable.

There's no single monthly price for solar, because the payment is built around your home. Three things set it:

• How much electricity you use. The system is sized from your past year of bills, which is why installers ask for your electric bill.
• Your roof. Its direction, shade and open space decide how many panels fit and how much power each one makes.
• How you pay. The same system turns into a different monthly number as a loan, a lease, a PPA or a one-time payment.

Three of the five ways to pay start with $0 down, so for many homeowners the first cost of solar is simply the first monthly payment.

What do you pay each month with a loan, lease or PPA?

Evergreen Solar offers five ways to pay. Here is what each one looks like on your monthly budget.

Loan. You own the system and pay it off in fixed monthly installments. You collect the state programs directly, such as SMART 3.0 in Massachusetts. The federal homeowner tax credit ended for systems installed after December 31, 2025, so owners now rely on those state programs instead.

Lease and PPA. Because these systems qualify for the 30% federal credit, you get a lower monthly payment or rate, which is often a better deal than buying. The company that owns the panels claims the credit and handles maintenance. A lease payment is the same each month. A PPA bill follows what the panels produce, so it runs higher in sunny summer months and lower in winter. Our lease vs. PPA comparison goes deeper. For systems that begin construction after July 4, 2026, the credit requires them to be in service by December 31, 2027.

Prepaid PPA and cash. Both leave you with no monthly solar payment. A prepaid PPA covers the system's expected power in one payment, carries a production guarantee, and lets you buy out the system after 5 years. Cash makes you the owner from day one, with no loan interest.

Our guide to solar financing compares all five side by side.

What goes into your total monthly cost with solar?

Your total monthly cost has two parts: your solar payment and the small utility bill that remains. That bill covers the utility's fixed customer charge and any power your net metering credits don't cover, and for most homes it stays small.

The fair comparison, then, is your solar payment plus that smaller utility bill against what you pay the utility today. Comparing the solar payment alone makes solar look better than it is, and comparing it with a single summer bill makes it look worse.

How does each solar payment behave from month to month?

The way you pay also decides whether your solar cost is the same every month or moves with the seasons. That matters for budgeting, and for reading your first few bills without surprises.

• Loan. The payment is the same amount every month for the loan term. Check whether it depends on a lump-sum paydown, since some solar loans reset to a higher payment if you skip one.
• Lease. A set monthly amount that doesn't follow the weather. Ask whether it stays flat for the whole term or changes each year.
• PPA. You pay for the power the panels make, so the bill is bigger in long summer months and smaller in winter. Judge it by the yearly total, not one month.
• Prepaid PPA and cash. No monthly solar payment, so the only bill that moves is the small one from the utility.

The utility bill has its own rhythm. It tends to be smallest in summer, when your panels send the most power to the grid, and largest in winter, when you lean on the credits you built up earlier in the year.

How much do solar panels save per month?

Across Evergreen Solar customers, savings average about 15% on day one. Here's what that looks like on a round number.

An example, not a quote: say your electric bill averages $200 a month. At the 15% average, your solar payment and the small remaining utility bill come to about $170 together. That leaves about $30 in your pocket in the first month. Your own numbers depend on your roof, your usage and how you pay.

Our state averages put yearly savings with solar at about $1,365 in Massachusetts, $1,285 in Connecticut and $1,240 in Rhode Island.

Treat the $200 example as an illustration only. A home with a bigger bill has more to save, and the state pages for Massachusetts, Connecticut and Rhode Island list the incentives behind them.

Why do monthly solar savings grow over time?

Your solar payment is predictable. Your utility's rates are not. Electric rates have tended to rise about 5% a year, so the bill you're avoiding gets bigger while a loan or lease payment stays put.

Go back to the $200 example. If rates rise about 5% in a year, the bill that home would have paid becomes about $210 a month, while the solar payment part of the $170 stays the same. The gap widens without you doing anything.

In our states, that trend matters more than most. Bay Staters pay over 85% more for electricity than the national average, and Massachusetts rates are up about 50% in the last five years. Rhode Island rates jumped 50% in the last five years too. Our post on why electric rates keep rising covers the reasons.

How can you tell if a monthly solar quote is a good deal?

A good quote shows your monthly solar payment, your expected remaining utility bill, and your current average bill side by side. If it doesn't, ask for that view. These questions help too:

1. Does the payment stay flat, or does it change each year? Ask to see it in writing for the full term.
2. For a loan, does the payment depend on a lump-sum paydown? The Consumer Financial Protection Bureau found that many solar loans re-amortize to a higher payment around month 19 if you don't make a large prepayment. Ask what your payment is with and without one.
3. Which incentives are counted, and who gets them? With a loan or cash, state programs come to you. With a lease or PPA, their value should show up as a lower payment or rate.

Our article on solar loan rates covers what else to check on a loan offer.

Questions about your own numbers? Call us at (508) 507-2908, and we'll price every option on the same design so you can see the monthly cost of each.

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