Solar States

Delaware · homeowner planning guide

Solar panels in Delaware: costs, incentives & payback

Delaware's small grid does heavy solar duty: a 25 kW residential net-metering cap, the Milford 12 MW and Dover 10 MW farms, and a solar carve-out rising to 3.5% of the RPS by 2025.

Sun resourceModerate sun resource
Sun (2024)4.34 kWh/m²/day
Federal credit30% (2022–25 installs only)
State incentiveCheck eligibility
Export rulesCheck utility tariff

Guide updated: 2026-09-11. Earlier local source notes dated 2026-08-16. Current program eligibility requires a separate check.

Plan with your own numbers

Solar tools for Delaware homeowners

Start with the solar calculator using your bill, fixed charges, self-consumption and export-price assumptions. The utility rules below are not automatically applied in the calculator. Utility production charges may need a separate adjustment; this is a planning scenario, not a utility tariff simulation or guaranteed savings.

Estimate solar size and cost in DelawareCalculate panels for a Delaware homeEstimate Delaware solar paybackCheck solar production context for DelawarePlan a home battery around Delaware export rules

Before comparing solar quotes in Delaware

For your Delaware quote, who owns the renewable energy certificates, and is any projected certificate income supported by a written agreement?

  1. Compare cash cost first. Divide the quoted solar cash price by system size in watts. Keep batteries, roof work and financing fees separate. Compare quotes by cost per watt.
  2. Separate incentives from bill savings. Require written eligibility and approval for each state or utility benefit. A pending application is not a guaranteed payment.
  3. Test the payback assumptions. Use your actual electricity bill and applicable export terms. Estimate your solar break-even year without unconfirmed incentives.

Federal credit: distinguish a past installation from a new one

The IRS states that the residential clean energy credit is not available for property placed in service after December 31, 2025. Paying before that date does not make a later completed installation eligible. A qualifying unused credit from an earlier installation is a separate tax question. Read the IRS credit guidance and installation-deadline FAQ (question 7).

Federal guidance checked 2026-09-11. This is general planning information, not individualized tax advice.

Source checks for Delaware homeowners

EIA Delaware energy profile provides state energy context, not a residential installation quote. Confirm current incentives with the administering agency and export terms with the utility named on your bill. These research links are not a confirmation that every local program described in the guide is currently open.

State context and earlier source notes

The notes below retain their recorded source dates. A dated reference is not a current tariff or an incentive approval; check the administering agency before relying on a financial claim.

  • source note 2026-08-16Delaware operates a solar renewable energy credit (SREC) framework tied to its RPS — credit prices and compliance demand set a second revenue line beyond bill savings for qualifying systems. — DSIRE Delaware SREC / RPS program records; DE PSC renewable portfolio materials — accessed 2026-08-16
  • source note 2026-08-16Delmarva Power territory dominates most Delaware rooftop interconnection volume; export and DG rules follow PSC-approved tariffs. — Delaware PSC DG tariffs; SEIA Delaware solar profile — accessed 2026-08-16
  • source note 2026-08-16As a small high-rate Mid-Atlantic state, Delaware often shows stronger residential bill-savings math than lower-rate Southeast peers at the same $/W. — U.S. EIA state electricity price tables; SEIA Delaware profile — accessed 2026-08-16
  • source note 2026-08-16State green energy fund / SREC pathways have historically supported residential adoption; program availability and SREC clearing prices change by compliance year. — DSIRE Delaware incentives index; DE SEU/PSC program notices — accessed 2026-08-16
  • source note 2026-08-16Federal 30% Residential Clean Energy Credit applied to qualifying Delaware systems in service through Dec 31 2025 per the IRS. — IRS Residential Clean Energy Credit guidance — accessed 2026-08-16

The 30% federal Residential Clean Energy Credit applied to qualifying systems in service by December 31, 2025 — per the IRS, property placed in service after that date does not qualify, so new 2026 installations cannot claim it. State and utility programs change often; the notes above carry their source date. See the federal credit guide.

Questions homeowners ask

Is solar worth it in Delaware?
Typically yes - rates are above average, the policy stack is stable (RPS carve-out, SRECs, retail net metering), and builders are plentiful. Sizing to your own use keeps credits flowing month to month; paybacks commonly land between 9-14 years with the federal credit.
Does Delaware have net metering?
Yes - residential up to 25 kW, commercial between 100 kW and 2 MW depending on utility and class, with surplus at retail on the next bill and a yearly optional cash-out at avoided cost. Credit rollover is the better value.
What are Delaware's SRECs worth?
Delaware's solar RPS produces an SREC market; prices have been modest (single digits to low teens per MWh) - check a broker for current bids. SREC income is usually small but stackable with the federal credit.
Is Delaware solar mostly rooftop?
No - the RPS supports rooftop, ground-mount and utility arrays alike (Dover 10 MW, Milford 12 MW), and commercial capacity now exceeds the rooftop-only decade; the 25 kW cap is per system while co-ops and towns build their own sites.
How much does the federal solar credit cover?
The federal Residential Clean Energy Credit covered 30% of qualified costs for systems in service from 2022 through December 31, 2025. Per the IRS, the credit is not available for property placed in service after that date. Delaware-specific programs are being verified and will appear here as confirmed.
Do I need a battery with solar in Delaware?
Not always — where utilities pay full-retail net metering, a battery's value is lower. Where net billing cuts export credits, batteries let you shift your own energy into the evening. Your Delaware utility tariff determines the math.
Can I install solar panels myself in Delaware?
DIY installs happen, but most utilities require a licensed electrician, permits and an inspection before interconnection. Check Delaware's permit office and your utility's interconnection rules first.

How to buy solar in Delaware — the honest version

  1. Model the math first. Get 2–3 quotes in $/W (dollars per watt, before credit) and compare on that number — not on "savings" projections. Use the quote scorecard.
  2. Check your utility's export rules. Retail net metering vs net billing changes whether you want a battery — see the notes above and the battery planner.
  3. Ask about the hidden three: permits, HOA rules and roof condition — walk the 16-question checklist before you sign.
  4. Confirm local sun. Measured 2024 irradiance for Delaware is on the sun look-up; national literacy starts at the federal credit guide.