Solar in Delaware costs about $2.83 per watt, so the typical 10.60 kW system runs about $30,000 before incentives. No single number is dramatic, but simple 1-to-1 net metering and rates rising 5.71% a year add up to a best-case payback of about 11.4 years. Delmarva customers who buy can also get a state grant, which shortens it.
Run the simple math on your own Delaware bill
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Four ordinary Delaware numbers that add up to a strong case
Delaware never makes the solar headlines. Price, power cost and sun all sit near the middle. What stands out is the combination: simple rules, and rates that keep climbing.
To see how Delaware pricing stacks up against every other state, browse our national solar cost guide.
Produce, net, carry forward: Delaware’s 1-to-1 rule with no asterisks
Under 26 Del. C. 1014, home systems up to 25 kW net meter monthly at 1-to-1. Extra kilowatt-hours carry forward to the next month.
Delmarva Power: about 64% of homes
Since January 2024, Delmarva credits monthly excess at the volumetric supply plus distribution charges.
Co-op and municipal: the rest
The Delaware Electric Cooperative (24% of homes) and the Dover and Newark municipal utilities run their own programs. Terms are similar in shape.
Simple on purposeAfter the fine print of neighboring states, Delaware’s rules read almost suspiciously simple. That makes a quote easy to check.
Co-op or municipal? Get it in writingIf the Delaware Electric Cooperative, Dover or Newark serves you, confirm your utility’s version of the terms in writing before you sign.
Ordinary inputs, a strong result: the 10.60 kW Delaware payback
The typical system, the median size Delaware homeowners installed in 2023, with no federal residential credit anywhere in the math.
Typical 10.60 kW system at $2.83 per watt
Best case means every kWh is worth the 17.79¢ state average. The rate on your own bill moves it either way.
17.79¢ is not your rateThe statewide average is ranking context, not a rate anyone pays. Delmarva files the residential rate about 64% of Delaware homes actually offset, so rerun the year-one figure with the rate on your own bill.
What $2.83 a watt buys in Delaware, 5 kW to 12 kW
The same benchmark across sizes, gross before incentives, with the yearly yield each size delivers at about 1,395 kWh per kilowatt.
Gross cost at $2.83 per watt, before incentives. Real quotes vary by roof, equipment and installer.
Four Delaware checks to run before you sign
Delaware’s small market has fewer installers, so these checks do the protecting:
- Which utility, which program? Delmarva’s terms are the reference. Co-op and municipal customers confirm their own versions first.
- Does the price pass the per-watt test? Divide the gross price by the wattage and hold it against $2.83. In a small market, bid discipline is your main protection.
- Is the contractor licensed? Delaware requires licensed contractors for solar work. Verify the license, and the electrician who will actually make the connection.
- What does a lease or PPA offer? Both are legal here, and a third-party owner can still claim the federal 48E credit. Compare that offer against ownership before assuming which wins.
Three Delaware homes where solar is not the move
The Delaware case is steady, not magic. Hold off if one of these fits:
- Your roof has under 12 years of life left. An 11.4-year best-case payback belongs on a roof that will outlive it.
- Your bill is small. Below roughly 700 kWh a month, shrink the system with your usage. The 25 kW ceiling is not a size to fill.
- The pitch runs on drama. Urgency, deadlines or vanishing programs are fiction here. Delaware’s case is steady rates and simple rules, and it needs no embellishment.
Get quotes at the Delaware benchmark
The simple rules make Delaware an easy state to price. Enter your ZIP code and hold every quote against $2.83 a watt.
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More on Delaware solar pricing
Frequently asked questions
How much do solar panels cost in Delaware in 2026?
About $2.83 per watt installed (EcoGen Solar Cost Index, September 2026 Edition), slightly under the national average. The typical 10.60 kW system runs about $30,000 before incentives.
Does Delaware have net metering in 2026?
Yes, full 1-to-1 net metering for residential systems up to 25 kW under 26 Del. C. 1014, with monthly netting and excess carrying forward. Delmarva credits monthly excess at effectively full volumetric value; co-op and municipal customers should confirm their utility’s version.
What is the solar payback period in Delaware?
About 11.4 years in the best case, if every kWh the 10.60 kW system makes replaces power at the 17.79¢ state average. Delmarva customers who buy the system can get a state Green Energy Program grant of $0.80 per watt, up to $10,000 and half the cost: about $8,480 on the 10.60 kW system, which shortens it. Co-op and town utility customers have different programs. Delaware’s rates have climbed 5.71% a year over the last five, one of the fastest sustained trends in the country, which is the quiet engine of the state’s solar case.
Is there a federal tax credit for solar in Delaware?
Not for systems you own: the 25D residential credit is $0 for host-owned systems whose installation is completed after December 31, 2025. Leases and PPAs are legal in Delaware, and the third-party owner can still claim the separate 48E credit, so compare both routes before buying.
Is Delaware actually a good state for solar?
Quietly, yes. No single number stands out, but full-retail netting with simple rules, mid-pack prices, and rates rising 5.71% a year combine into one of the cleanest payback cases in the Mid-Atlantic, about 11.4 years in the best case for a typical system.
How we calculate these costs
Cost figures use Delaware’s entry in the EcoGen Solar Cost Index (September 2026 Edition), $2.83 per watt. Payback is a simple best case: the typical cost divided by the year-one value of the power the system makes at the 17.79¢ state average, with no federal residential credit for host-owned systems, no rate growth and no export discount. The 10.60 kW typical size is Berkeley Lab’s 2023 median for Delaware single-family installs (153 systems).
Sources (7)
- Delaware General Assembly, Delaware Code Title 26, Section 1014 (net metering statute): delcode.delaware.gov
- Delmarva Power, Residential Net Metering Terms (effective January 1, 2024): delmarva.com
- U.S. EIA, Electric Power Monthly, residential price by state, 12-month average August 2025 to July 2026: eia.gov
- U.S. EIA, Form EIA-861 Annual Electric Power Industry Report, 2024: eia.gov
- U.S. Census Bureau, American Community Survey, 2024: census.gov
- IRS, One, Big, Beautiful Bill Provisions (Public Law 119-21, Section 25D): irs.gov
- DSIRE, Third-Party Solar PV Power Purchase Agreement Policies (May 2026): ncsolarcen-prod.s3.amazonaws.com
