Solar in Delaware: Small State, Surprisingly Strong Solar Economics

Delaware is easy to overlook. It is the second-smallest state in the country, and it does not get the solar headlines that California, Texas, or Florida grab. But here is what most people miss — Delaware has a genuinely solid setup for residential solar. The combination of decent sun, strong net metering, a renewable portfolio standard, and SREC-like incentives creates economics that outperform what the state's size might suggest.

If you are a Delaware homeowner considering solar in 2026, here is the honest picture.

The Good News

Strong Net Metering Policy

Delaware requires investor-owned utilities to offer net metering at full retail rate for systems up to 25 kW. Delmarva Power, which serves the vast majority of the state, credits you dollar-for-dollar for every kilowatt-hour you send back to the grid. Excess credits roll over month to month, and at the end of an annual cycle, the utility pays you for any remaining balance at the avoided cost rate.

This is a big deal. Full retail net metering is the single most important policy for residential solar economics, and Delaware has it locked in.

Delaware Green Energy Program (SREC Alternative)

Delaware's Renewable Portfolio Standard requires utilities to source a portion of their electricity from solar. To meet this, Delmarva Power and other utilities purchase Solar Renewable Energy Credits (SRECs) from solar system owners. As a homeowner with solar, you generate one SREC for every 1,000 kWh your system produces.

SREC prices in Delaware have historically ranged from $20 to $60 per credit. For a typical residential system producing 9,000-10,000 kWh per year, that is an extra $180-$600 annually on top of your net metering savings. Not life-changing money, but it shortens payback meaningfully.

No Sales Tax on Solar Equipment

Delaware has no sales tax at all — on anything. This is not a solar-specific incentive, but it means you save 5-7% compared to homeowners in neighboring states like Pennsylvania or New Jersey who pay sales tax on their solar equipment. On a $24,000 system, that is $1,200-$1,680 you do not pay.

Property Tax Exemption

The added value of a solar installation is exempt from Delaware property taxes. Solar typically adds $15,000-$20,000 to home value. Without the exemption, that would increase your annual property tax bill by $100-$200 depending on your county's rate. The exemption eliminates that.

The Challenges

No State Tax Credit

Delaware does not offer a state income tax credit for solar installations. With the federal ITC also expired as of January 1, 2026, there is no upfront tax credit available. This is the biggest gap in Delaware's incentive structure. Your cost savings come from net metering, SRECs, and avoided electricity costs — not from day-one credits.

Moderate Sun Hours

Delaware averages 4.2-4.7 peak sun hours per day. That is slightly below the national average and well below Sun Belt states. You will need a slightly larger system to offset the same electricity bill compared to someone in Arizona or Texas. The good news is that Delaware is comparable to New Jersey and Massachusetts, both of which have thriving solar markets.

Limited Installer Competition

Delaware's small size means fewer installers compete for your business compared to larger states. Fewer installers can mean higher per-watt pricing and less negotiating leverage. Get at least three quotes and include regional installers from the broader Delmarva and Philadelphia markets.

The Delaware Solar Math (2026)

Typical 7kW system:

• Installed cost: $22,400 ($3.20/watt)
• Federal ITC: $0 (expired January 1, 2026)
• State credits: $0
• Net cost: ~$22,400

Annual production: ~9,100 kWh

Average Delmarva rate: $0.14-$0.16/kWh

Annual net metering savings: $1,275-$1,460

Annual SREC income: ~$200-$400

Total annual benefit: $1,475-$1,860

Payback period: 12-15 years

25-year savings: $20,000-$32,000

The payback period is not the fastest in the country, but 25-year savings are solid. If Delmarva rates continue climbing at 3-4% annually — and they have historically — the back end of that 25-year window gets very profitable.

Given Delaware's limited installer competition, comparing multiple quotes is especially important to avoid overpaying.

When Solar Makes Sense in Delaware

Install if:

• Your monthly Delmarva bill is over $120
• You plan to stay in your home 10+ years
• Your roof has a south or southwest facing section with minimal shading
• You want to lock in energy costs as electricity rates rise
• You are comfortable with a 12-15 year payback for long-term savings

Wait or skip if:

• Your electricity bill is under $80/month
• You are renting or plan to move within 5 years
• Your roof needs replacement in the next 5 years (do the roof first)
• Heavy tree cover shades your roof for most of the day

Key Takeaways

• Delaware has full retail net metering through Delmarva Power — the most important policy for solar economics
• No federal or state tax credit is available in 2026, making upfront costs higher
• SRECs provide $200-$600 per year in additional income on top of net metering savings
• No sales tax in Delaware saves you 5-7% compared to neighboring states
• Property tax exemption protects you from increased assessments after installation
• Typical payback is 12-15 years with 25-year savings of $20,000-$32,000
• Get multiple quotes — Delaware's small market means less installer competition and wider price variation

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