Delaware is one of the more generous US solar markets in 2026. Our model puts typical solar-only payback in the 9-11 year range even with the federal §25D credit dead — and that's before the SREC option. The reason is a structural stack of advantages most US states don't combine:
- Full-retail 1:1 net metering on every utility (Delmarva, Delaware Electric Cooperative, DEMEC municipals) — same DE law, uniform across the state.
- No state sales tax on anything, including solar — Delaware is one of only 5 US states without a sales tax.
- Automatic property tax exemption — DE exempts ALL personal property, and residential rooftop solar qualifies.
- A LIVE SREC market with real money (about $30/SREC for the first 10 years), or, alternately, an upfront cash rebate through the Green Energy Program.
The catch — and the single most important Delaware solar decision — is that the Green Energy Program rebate and the SREC stream are MUTUALLY EXCLUSIVE at most DE utilities. Take the rebate and you assign your SRECs to the state for the program term; keep your SRECs and you skip the rebate. You pick ONE at install. The right answer depends on system size and time horizon. We walk through both below, and the calculator above offers a Rebate-vs-SREC toggle that runs both.
What changed federally — and what's still on Delaware quotes that shouldn't be
The federal Residential Clean Energy Credit (§25D) — the 30% homeowner credit — was repealed for systems installed after December 31, 2025. For 2026 Delaware buyers, the federal credit on a purchased system is $0. The same applies to home batteries purchased outright. The §48E commercial credit (30%) still exists, but only for leased or third-party-owned systems where construction begins before July 4, 2026 — and the lessor claims it, not you. Full federal context here.
The repeal came through the One Big Beautiful Bill Act (P.L. 119-21), signed in July 2025. Many DE-focused solar marketing sites (solarsme, lumina, a1solar and others) still quote the 30% credit as live — outdated. If a 2026 Delaware quote includes "30% federal solar tax credit" on a purchase, ask the contractor to redo the math with $0 federal and verify with IRS.
VERIFIED 2026-06 · IRS §25D repeal under OBBBA P.L. 119-21Net metering — full retail 1:1, every utility
Delaware Code Title 26 § 1014 mandates full retail 1:1 net metering across every Delaware electric utility — Delmarva Power (the largest, serving most DE residential customers), Delaware Electric Cooperative (DEC, serving Kent and Sussex counties), and the DEMEC municipal utilities (City of Newark Electric Department and other Delaware municipals). Same rule everywhere: both self-consumed AND exported kWh credit at full retail (about $0.165/kWh all-in).
How it works in practice:
- Credits roll over in kWh, not dollars, across a 12-month true-up cycle. You pick your true-up month at enrollment — March or April are commonly recommended so the annual surplus settles right after high-production months.
- On the true-up anniversary, any net surplus is paid out as a check at retail rate OR forfeited, depending on your enrollment choice. Don't oversize past your annual usage — surplus can be lost.
- Fixed costs (meter fee, customer charges) are paid in cash and NOT offset by credits. Solar reduces your usage charges, not your fixed monthly minimums.
- Cap: size to no more than 110% of last year's consumption, ≤25 kW residential.
Retail electricity rate. About $0.165/kWh all-in on Delmarva (2026). The supply component priced under DE PSC Docket 26-0389 (March 2026) is roughly $0.111/kWh summer and $0.114/kWh winter — that's SUPPLY only; delivery and transmission add about $0.05 to reach all-in retail. Delmarva customers face roughly a 9% bill increase in 2026. Rising retail favors solar.
VERIFIED 2026-06 · DE Code Title 26 § 1014; DE PSC Docket 26-0389The main choice — Green Energy rebate OR keep your SRECs
Here is the single most important Delaware solar decision. The Green Energy Program upfront rebate and the SREC stream are mutually exclusive at most DE utilities: at the rebate enrollment, you assign your SRECs to the state for the program term. You cannot stack both. The calculator above runs both paths so you can compare.
Path 1 — Green Energy Program rebate (default)
The Green Energy Program is an upfront cash rebate (NOT a tax credit) administered by DNREC and the DEMEC municipals, per utility:
- Delmarva Power: $0.70/W up to a $6,000 cap. On a 5 kW system: 5 × $700 = $3,500 (under the cap). On 8 kW: 8 × $700 = $5,600 (under the cap). On 10 kW: capped at $6,000.
- Delaware Electric Cooperative (DEC): $0.50/W on first 5 kW, then $0.20/W beyond, cap $2,000-3,500 (Class A / Class B tiers).
- DEMEC municipals (City of Newark Electric Department and others): $1.00/W on first 5 kW, then $0.50/W beyond, cap $3,500.
Cash at install, lower-risk than the SREC stream, paid against your net cost. But: SREC revenue = $0 for the program term — your SRECs are assigned to the state. The calculator's default is this path because for most typical residential system sizes (5-8 kW) on Delmarva, the rebate beats the SREC math early and your money arrives upfront.
Path 2 — Keep your SRECs (no rebate)
Skip the rebate, keep your SREC revenue from the Delaware SREC Procurement Program (administered through Delmarva, competitive procurement). The tiered structure:
- Years 1-10: about $30/SREC (1 SREC = 1 MWh, so about $0.030/kWh of production).
- Years 11-25: about $10/SREC (about $0.010/kWh of production).
The market is currently oversupplied so the tier-1 rate is stable around $30. Revenue is tied to your actual annual production — it scales with system size, not flat. For a typical 8 kW Delaware system producing about 10.8 MWh/year: roughly $325/year SREC revenue for the first 10 years, then about $108/year for years 11-25. Lifetime SREC revenue on that system runs about $4,800.
CRITICAL — don't confuse SREC price with SACP cap. You may see "$150" or "$400" cited as Delaware SREC numbers. Those are the Solar Alternative Compliance Payment (SACP) caps — the COMPLIANCE PENALTY on utilities that miss their RPS targets, NOT what homeowners are paid per SREC. The real homeowner SREC price is about $30 (tier 1) / $10 (tier 2). Two different numbers; many DE solar pages confuse them.
How to choose
Rough heuristic — verify with the calculator:
- Smaller systems (≤6 kW on Delmarva) and shorter horizons — rebate usually wins. Upfront cash, faster payback, lower risk.
- Larger systems (8+ kW on Delmarva) and the full 25-year horizon — SREC can pull ahead. Total SREC revenue over 25 years can exceed the $6,000 rebate cap.
- Cash-now versus risk preference — rebate is locked, SREC market prices can drift. The current $30 tier-1 is stable but not guaranteed for new entrants in future procurements.
You pick at install. You cannot switch later. Use the calculator's Rebate vs SREC toggle on the same ZIP and system size to see both numbers.
Delaware's RPS is 25% renewable by 2026 with a 3.5% solar carve-out — that's the policy backbone keeping the SREC market live. As long as the RPS holds, the SREC stream has a floor.
VERIFIED 2026-06 · DNREC Green Energy Program; DE SREC Procurement ProgramNo state sales tax — structural advantage
Delaware has NO state sales tax at all. Not on solar specifically — on anything. Delaware is one of only 5 US states without a state sales tax (Oregon, Montana, New Hampshire, Delaware, Alaska).
Solar equipment is automatically untaxed at retail — saving roughly $1,000-1,140 versus typical sales-tax-state install pricing on a $14,250 system. That's not a solar incentive; it's a structural feature of Delaware tax law that benefits solar buyers as a side effect. Doesn't show up on most solar comparison sites because they assume a sales tax exists.
For context: states like Pennsylvania, Maine, Ohio, and Louisiana confirmed do NOT exempt solar from sales tax — buyers there add $1,000-1,350 in real sales tax to their installed quote. Delaware buyers don't.
Property tax — exempt automatically
Delaware exempts ALL personal property from property tax — and residential rooftop solar is treated as personal property. So solar adds ZERO to your property tax bill, automatic, no application required.
This is a different mechanism from states like Florida or New Jersey that have an explicit solar-specific property exemption. Delaware's exemption is the broader personal-property exclusion — solar qualifies as one consequence. Effect for you is the same: no property tax uplift from going solar.
No state income tax credit. Delaware does not offer a state-level solar income tax credit. The state-level incentives are net metering, the Green Energy rebate OR the SREC stream (you pick one), the no-sales-tax bonus, and the property exemption.
Battery — no statewide rebate, low arbitrage
Under Delaware's full-retail 1:1 net metering, exports already credit at retail (about $0.165/kWh) — same as what you'd save by self-consuming. So the retail-vs-export arbitrage gap is essentially ZERO — same as Florida, Virginia, New Mexico, Colorado, Massachusetts, New Jersey, or New York legacy net metering. A battery has no meaningful arbitrage value in Delaware.
Delaware also has NO statewide battery rebate. Solarreviews flags this as a gap versus neighbors (Maryland has the Energy Storage Income Tax Credit; other neighbors have utility programs). The federal storage credit is also $0 (§25D repealed for storage purchase).
The honest read: install a battery in Delaware for backup / resilience (coastal storms, occasional grid issues), not for ROI. Your payback math improves by approximately zero. The resilience math is a personal-tolerance question.
A risk to watch — Senate Joint Resolution No. 1
Delaware Senate Joint Resolution No. 1 (January 2025) requires all DE net-metering utilities to participate in a formal cost-benefit study of net metering. The current 1:1 retail terms remain fully in force in 2026, but the study is the kind of formal review that has preceded NM changes in other states.
Two recent precedents:
- Ohio: PUCO on January 7, 2026 (Docket 25-0349-EL-ORD) rejected an AEP push to gut net metering — current rules survived.
- California: NEM 2.0 became NEM 3.0 (avoided-cost export) in 2023 after a similar review process — net metering economics worsened materially.
DE could go either way. Worth watching the SJR1 outcome before installing if you're sensitive to that risk. Existing systems are typically grandfathered when NM rules change, so an early install captures the current terms.
The honest payback — short, even without federal
At default install pricing of $2.85/W (range $2.19-2.99; delawaresolar 2025-2026), our model puts typical Delaware solar-only payback in the 9-11 year range on a representative 5-8 kW system, without the federal credit, on the modeled default Rebate path. The SREC path runs a bit longer on payback (cash takes longer to arrive) but typically delivers a higher 25-year net.
Delaware fits in our verified set as a strong middle-to-upper-tier state:
- Massachusetts (about $0.30/kWh retail + SMART): high single digits.
- New Jersey (about $0.26/kWh + SuSI): about 6.5 years.
- Rhode Island (about $0.29/kWh + 80% NM + REF or REG): about 8-10 years.
- Connecticut (about $0.29/kWh + Netting minus SEA): about 8-10 years.
- Delaware (about $0.165/kWh + 1:1 NM + rebate OR SREC + no sales tax + property exempt): about 9-11 years.
- Ohio (about $0.16/kWh + energy-only SSO export): about 12-14 years.
Delaware's retail rate is materially lower than New England — but the no-sales-tax bonus, the property exemption, the rebate or SREC stack, and full 1:1 net metering compensate. The math holds up even with the federal credit dead.
VERIFIED 2026-06 · eia.gov Run your real Delaware payback (Rebate vs SREC) →The honest picture
| Fact | Delaware (Delmarva default) | Source |
|---|---|---|
| Federal credit | $0 (purchase) | IRS — §25D repealed under OBBBA P.L. 119-21 |
| State income tax credit | None | (no statute) |
| Net metering | Full retail 1:1 (self + export both at about $0.165/kWh) | DE Code Title 26 § 1014 |
| Utilities under same rule | Delmarva, DEC, DEMEC municipals (Newark and other towns) | DE Code Title 26 § 1014 |
| True-up | 12-month cycle (March/April commonly), surplus paid at retail OR forfeited | Delmarva Schedule NM-S |
| Residential cap | 110% of prior-year consumption, ≤25 kW | DE PSC |
| Retail rate | About $0.165/kWh all-in (rising about 9% in 2026) | eia.gov; DE PSC Docket 26-0389 |
| Green Energy rebate (Delmarva) | $0.70/W upfront, cap $6,000 | DNREC Green Energy Program |
| Green Energy rebate (DEC) | $0.50/W first 5 kW + $0.20/W beyond, cap $2,000-3,500 | DNREC Green Energy Program |
| Green Energy rebate (DEMEC) | $1.00/W first 5 kW + $0.50/W beyond, cap $3,500 | DEMEC Green Energy Programs |
| SREC tier 1 | About $30/SREC years 1-10 (about $0.030/kWh) | DE SREC Procurement Program |
| SREC tier 2 | About $10/SREC years 11-25 (about $0.010/kWh) | DE SREC Procurement Program |
| Rebate vs SREC | MUTUALLY EXCLUSIVE at most DE utilities — pick ONE at install | DNREC; DE SREC Program rules |
| SACP (do NOT confuse with SREC price) | $150 or $400 cap = utility COMPLIANCE PENALTY, not homeowner income | DE RPS |
| Sales tax | NO state sales tax at all (one of 5 no-sales-tax US states) | Delaware tax code |
| Property tax | EXEMPT automatically (all personal property exempt) | DE Code Title 9 |
| Battery state rebate | $0 (no statewide program) | (gap vs MD neighbor) |
| Battery federal credit | $0 (§25D repealed for storage) | IRS — §25D repealed |
| RPS / solar carve-out | 25% renewable by 2026, 3.5% solar carve-out | DE RPS |
| NM under review | Senate Joint Resolution No. 1 (Jan 2025) — formal cost-benefit study | DE SJR No. 1 |
| Typical solar-only payback | About 9-11 years (Rebate path; SREC path comparable lifetime) | This calculator (post-§25D) |
Before you commit:
- Reject any quote that includes a 30% federal credit. Repealed for 2026 purchases.
- Pick rebate OR SREC at install — you cannot stack. Run both in the calculator. Rebate usually wins on smaller systems and shorter horizons; SREC can pull ahead on larger systems over the full 25 years.
- Don't confuse SREC price (~$30) with SACP ($150/$400). SACP is the utility's compliance penalty, not your income per SREC.
- Don't budget for a 30% federal credit on battery. Repealed for storage purchase too.
- No need to budget for sales tax — Delaware doesn't have one. Your quote should be net of sales tax automatically. Saves about $1,000-1,140 versus sales-tax-state pricing.
- No need to budget for property tax uplift — exempt automatically as personal property.
- Don't oversize past 110% of annual consumption — surplus can be forfeited at true-up.
- Pick a March or April true-up month at enrollment so the annual surplus settles right after high-production months.
- Battery is a resilience purchase, not an ROI purchase. Arbitrage gap is near zero under 1:1 retail NM, no state battery rebate, federal storage credit $0.
- Watch SJR No. 1. The NM cost-benefit study is the kind of formal review that has preceded NM changes elsewhere (California NEM 2 → 3 in 2023). Existing systems typically grandfather.
Estimates only — SREC procurement prices change with each Delmarva auction, Green Energy Program funding is allocated annually and can be exhausted, SJR1 study outcome may change net metering terms in future years. Verify with the Delaware PSC, your utility (Delmarva Power, Delaware Electric Cooperative, or your DEMEC municipal — City of Newark Electric Department or others), DNREC for Green Energy Program enrollment, and the Delmarva SREC procurement schedule. This is not financial advice.