Delaware Solar in 2026: The Honest Picture

Delaware homeowners face a significant shift in solar economics in 2026. The federal Residential Clean Energy Credit (Section 25D), which provided a 30% tax credit for residential solar installations, expired on December 31, 2025. Systems placed in service after that date no longer qualify. This means Delaware residents can no longer rely on the federal incentive that made solar affordable for millions of Americans over the past decade.

However, Delaware itself has stepped up with meaningful state-level incentives that partially offset this loss. The state offers a 10% income tax credit (capped at $3,750), a full property tax exemption on solar-added home value, and zero sales tax on solar equipment and installation. Combined with net metering from Delmarva Power & Light and other utilities, solar remains financially viable for most Delaware homeowners, though the payback period has lengthened slightly.

This guide walks through current costs, realistic savings, available incentives, and what to expect when shopping for solar in Delaware in 2026.

Average Solar System Cost in Delaware (2026)

A typical 6 kW residential solar system in Delaware costs between $24,000 and $29,000 before incentives, or roughly $4.00 to $4.75 per watt. This aligns with national averages and reflects current equipment, labor, and permitting costs.

Cost breakdown for a 6 kW system:

  • Solar panels (18-22 panels): $8,000 to $10,000
  • Inverter and electrical equipment: $3,500 to $4,500
  • Labor and installation: $6,000 to $8,000
  • Permitting, inspection, and interconnection: $2,500 to $3,500
  • Monitoring and warranty: $1,500 to $2,500

After applying Delaware’s 10% state tax credit (up to $3,750), the net cost drops to approximately $20,250 to $25,250. If you finance the system with a solar loan, you avoid the upfront cost but pay interest over the loan term (typically 10 to 15 years).

For current pricing in your area, consult the EnergySage cost benchmarks for Delaware.

Real Delaware Homeowner Savings (Sample Scenarios)

Savings depend on your location, roof orientation, electricity consumption, and utility rates. Here are four realistic examples:

Wilmington (Delmarva Power & Light, 6 kW system, $26,500 installed):

  • Annual electricity production: 7,200 kWh
  • Annual electricity cost avoided: $1,080 (at $0.15/kWh)
  • 25-year savings: $27,000 (accounting for 2% annual rate increases)
  • Payback period: 9 years

Newark (Delmarva Power & Light, 6 kW system, $26,500 installed):

  • Annual electricity production: 7,400 kWh
  • Annual electricity cost avoided: $1,110
  • 25-year savings: $28,500
  • Payback period: 8.5 years

Dover (Delmarva Power & Light, 5 kW system, $22,000 installed):

  • Annual electricity production: 6,000 kWh
  • Annual electricity cost avoided: $900
  • 25-year savings: $23,000
  • Payback period: 9.5 years

Georgetown (Delaware Electric Cooperative, 6 kW system, $26,500 installed):

  • Annual electricity production: 7,100 kWh
  • Annual electricity cost avoided: $1,065 (at $0.15/kWh)
  • 25-year savings: $26,500
  • Payback period: 9.5 years

These estimates assume average roof conditions, no shading, and stable electricity rates. Actual results vary based on your specific home and usage patterns.

Delaware Solar Incentives Still Available in 2026

Delaware Residential Solar Energy Tax Credit

Delaware offers a 10% state income tax credit on the total installed cost of a solar system, capped at $3,750. This applies to owner-financed systems and is claimed on your Delaware tax return in the year the system is placed in service. Unlike the expired federal credit, this is not a one-time credit per household; however, it is limited to one system per property.

For a $26,500 system, you would receive a $2,650 credit (10% of cost). For a $37,500 system, you would receive the maximum $3,750 credit.

Property Tax Exemption

Delaware law exempts the added home value from solar installations from property tax assessment. If your home value increases by $25,000 due to solar, your property tax bill will not reflect that increase. This exemption applies indefinitely and requires no application; it is automatic upon system completion.

Sales Tax Exemption

Delaware has no sales tax, so solar equipment and installation labor are not subject to state sales tax. This is a significant advantage compared to neighboring states and effectively reduces your net cost by 5% to 7% compared to states with sales tax.

Net Metering

Delmarva Power & Light, which serves most of Delaware, offers net metering on a 1:1 basis. Excess solar generation is credited at the full retail electricity rate, not a reduced “avoided cost” rate. This means if you generate 500 kWh in a month and use 400 kWh, you receive a $15 credit (at $0.15/kWh) on your next bill. Delaware Electric Cooperative also participates in net metering.

Net metering is essential to solar economics in Delaware. Without it, payback periods would extend significantly.

Utility Rebates and Programs

Delmarva Power & Light occasionally offers rebates or demand-side management programs for solar customers. Check with your utility directly for current offerings. The DSIRE database maintains a comprehensive list of all active state and local incentives.

Federal Section 48E (Third-Party Lease Option)

If you cannot finance a system outright or prefer not to, a third-party-owned solar lease may still qualify for a federal investment tax credit under Section 48E. However, construction must have begun before July 4, 2026. Lease payments are typically 10% to 30% lower than ownership, but you do not own the system or claim state tax credits. This option is narrowing as the July 2026 deadline approaches.

Is Solar Worth It in Delaware Without the Federal Credit?

The loss of the federal Section 25D credit makes solar less attractive than it was in 2024 and 2025, but it remains a sound investment for most Delaware homeowners. Here is the decision framework:

Solar makes financial sense if:

  • You plan to stay in your home for at least 8 to 10 years (the payback period).
  • Your roof is in good condition and receives at least 4 to 5 hours of direct sunlight daily.
  • Your electricity rate is $0.13/kWh or higher (Delaware averages $0.15/kWh).
  • You can finance the system with a loan or pay cash without straining your budget.

Solar is less attractive if:

  • You plan to move within 5 to 7 years.
  • Your roof is heavily shaded or faces north.
  • Your electricity rate is below $0.12/kWh (unlikely in Delaware).
  • You cannot qualify for financing or prefer to avoid debt.

The state tax credit ($3,750 max) and property tax exemption reduce your net cost and improve payback, but they do not fully replace the lost federal credit. A 6 kW system that cost $18,500 after the federal credit in 2025 now costs approximately $22,750 after the state credit in 2026. That extra $4,250 extends payback by roughly one year.

For most Delaware homeowners with moderate to high electricity consumption, the 8 to 10 year payback is acceptable, especially given the 25+ year lifespan of modern solar panels.

Top Cities for Solar in Delaware

  • Wilmington: Largest city, good solar irradiance (4.2 kWh/m2/day), served by Delmarva Power & Light with net metering. Average payback: 9 years.
  • Newark: Home to University of Delaware, similar irradiance to Wilmington, strong net metering support. Average payback: 8.5 years.
  • Dover: State capital, slightly lower irradiance due to more cloud cover, but still viable. Average payback: 9.5 years.
  • Claymont: Northern Delaware, good irradiance, served by Delmarva Power & Light. Average payback: 8.5 years.
  • Rehoboth Beach: Coastal city, slightly higher irradiance due to ocean reflection, popular for residential solar. Average payback: 8 years.
  • Georgetown: Southern Delaware, served by Delaware Electric Cooperative, good solar resource. Average payback: 9.5 years.

Solar irradiance across Delaware averages 4.2 kWh/m2/day, which is moderate compared to sunnier states but sufficient for cost-effective solar. For detailed solar resource maps, see the NREL solar resource database.

What to Look for in a Delaware Solar Installer

  1. Delaware License and Insurance: Verify the installer holds a valid Delaware contractor license and carries general liability and workers’ compensation insurance. Check the Delaware Division of Professional Regulation database.

  2. Net Metering Expertise: The installer should understand Delaware’s net metering rules and be able to explain how excess generation will be credited. They should have experience interconnecting with Delmarva Power & Light and Delaware Electric Cooperative.

  3. State Incentive Knowledge: The installer should be able to walk you through the 10% state tax credit, property tax exemption, and sales tax exemption. They should help you claim these on your tax return or provide clear documentation.

  4. Permitting and Interconnection: The installer should handle all permitting with your local jurisdiction (Wilmington, Dover, etc.) and utility interconnection. Ask how long this typically takes and what happens if there are delays.

  5. Equipment Quality and Warranty: Verify that panels carry a 25-year performance warranty and the inverter carries at least a 10-year warranty. Ask about the installer’s warranty on labor and workmanship (typically 5 to 10 years).

  6. References and Reviews: Request at least three local references from systems installed in the past 12 months. Check Google, Yelp, and the Better Business Bureau for reviews. Look for patterns of customer satisfaction, not just isolated complaints.

  7. Financing Options: The installer should offer multiple financing paths: cash purchase, solar loans, leases, or power purchase agreements (PPAs). They should explain the pros and cons of each and help you choose based on your situation.

Get Free Quotes From Vetted Delaware Installers

The best way to compare costs and incentives is to request free quotes from multiple installers. Most Delaware installers offer free site assessments and custom quotes within 24 to 48 hours.

When requesting quotes, provide:

  • Your recent electricity bills (12 months) to show usage and rates.
  • Photos of your roof and its orientation.
  • Your address and utility provider.
  • Your preferred financing method (cash, loan, lease).

Ask each installer to itemize the cost, show the state tax credit and property tax exemption in writing, and provide a timeline from quote to system activation.

Compare not just price but also warranty, equipment quality, and customer service. The cheapest quote is not always the best value if the installer has poor reviews or uses low-quality equipment.

Sources for 2026 data: IRS Section 25D guidance, DSIRE state incentive database, Delaware Division of Professional Regulation, Delmarva Power & Light, Delaware Electric Cooperative, SEIA state market data, NREL solar resource maps, EnergySage cost benchmarks, Delaware Department of Finance.