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Derry solar costs $2.85–$3.15 per watt in 2026. A typical 8 kW system runs $22,800–$25,200. As the 4th most populous municipality in NH (~34,000 residents), Derry sits on the I-93 corridor with excellent access to installers from Manchester and southern New Hampshire.
Avg Cost/Watt
$3.00/W
8 kW System
~$24,000
Federal ITC
$0
Cash Payback
~8.5 yr
Federal Residential Solar Tax Credit (Section 25D) Expired December 31, 2025
Derry homeowners who purchase solar with cash or a loan receive $0 in federal tax credits. NH state rebate was also permanently repealed (SB 303). All prices below reflect what you actually pay. PPA/lease providers can still claim Section 48/48E (30%) through July 4, 2026. Full NH solar guide
Derry pricing reflects Eversource NH territory and a competitive installer market along the I-93 corridor. No federal ITC, no state rebate — these are real 2026 out-of-pocket costs.
| System Size | Price Range |
|---|---|
| 5 kW | $14,250–$15,750 |
| 6 kW | $17,100–$18,900 |
| 8 kWMOST COMMON | $22,800–$25,200 |
| 10 kW | $28,500–$31,500 |
| 12 kW | $34,200–$37,800 |
Prices as of March 2026. Based on Derry-area installer data and EnergySage NH marketplace. No federal 25D ITC ($0). No NH state rebate (SB 303). No state sales tax (NH advantage).
Derry's Eversource territory, property tax exemption, I-93 corridor location, and suburban housing stock shape the economics.
Derry is served by Eversource NH at $0.25/kWh. NEM 2.0 credits are approximately $0.21/kWh (~85% of retail). Credits roll over indefinitely with cash-out at $100. Rates are locked through 2041 under Docket DE 16-576.
Derry has adopted RSA 72:62 at town meeting, exempting solar energy systems from property tax. Your 8 kW system adds $0 to your assessed value, saving approximately $584/year based on Rockingham County mill rates.
Derry sits right on the I-93 corridor, giving homeowners access to multiple installer options from Manchester, Nashua, and southern NH. More competition means better quotes and faster scheduling.
New Hampshire has no state sales tax at all. Unlike MA (6.25%) or CT (6.35%), you pay zero sales tax on solar equipment and installation. This saves $1,500+ compared to neighboring states on a typical system.
Derry has a wide mix of housing: older village center homes, 1970s-90s subdivisions with good south-facing roofs, and newer developments near Exit 4A that are ideal for solar. Most suburban lots have minimal shading.
Derry participates in the Community Power Coalition of NH (CPCNH). Community Power can lower the supply portion of your bill by 5-15%. Solar customers still get NEM credits through Eversource for delivery and transmission.
How an 8 kW cash-purchased system pays back in Derry with no federal credit and no state rebate.
Third-Party Ownership (TPO) Still Has the ITC
If you go with a PPA or lease, the financing company claims Section 48/48E (30%) on systems beginning construction before July 4, 2026. You get a lower monthly rate because of it. You do not own the system and NEM credits typically go to the system owner.
Derry's location, housing stock, and demographics make it one of southern NH's best opportunities for residential solar.
Derry is a major commuter town — just 45 minutes to Boston via I-93. Many residents work in the Boston metro and earn Massachusetts salaries while enjoying NH's zero income tax and zero sales tax. High household incomes in Rockingham County mean strong purchasing power for solar, and many homeowners are also adding EV chargers alongside solar systems.
Derry's housing stock is predominantly 1970s-90s subdivisions with standard asphalt shingle roofs and good south-facing exposure. The newer developments near Exit 4A have modern roof designs well-suited for solar. Unlike dense urban areas, most Derry lots have minimal tree shading on the south side, reducing the need for expensive tree removal.
Rockingham County has some of NH's highest median home values. Solar adds real resale value to homes — studies show a $15,000-$20,000 premium for owned solar systems. With RSA 72:62 adopted in Derry, that added value is entirely property tax exempt, making solar a strong investment for homeowners planning to sell within 10-15 years.
Derry is home to the Robert Frost Farm, where the poet lived from 1900-1911 and wrote many of his iconic New England poems. The town blends historic character with modern suburban growth. Solar installations in the village center area may need to consider aesthetics, but the vast majority of Derry's residential areas have no historic restrictions on rooftop solar.
Derry's I-93 location keeps pricing competitive with neighboring Londonderry and Salem.
| City | Cost/W | 8 kW Avg | Payback |
|---|---|---|---|
| DerryYOU ARE HERE | $2.85-$3.15/W | $24,000 | ~8.5 yr |
| Londonderry | $2.85-$3.15/W | $24,000 | ~9.5 yr |
| Salem | $2.85-$3.20/W | $24,200 | ~9.8 yr |
| Manchester | $2.85-$3.20/W | $24,200 | ~9.3 yr |
Salem uses Liberty Utilities at $0.24/kWh (slightly lower rate, slightly longer payback). Manchester has the most installer competition as the largest city. All four towns have adopted RSA 72:62 property tax exemptions.
Derry has a straightforward permitting process. Most residential solar permits are issued within 2-3 weeks.
Your installer submits plans to the Derry Building Department. Standard residential solar permits include structural and electrical drawings. Typical processing: 1-2 weeks.
Physical installation of panels, inverter, and electrical connections. Most Derry homes with standard roofs are completed in 1-2 days.
Derry electrical inspector signs off on the installation. Typically scheduled within 1 week of completion.
NEM 2.0 enrollment and bi-directional meter installation. Takes 2-4 weeks after passing inspection. Your installer submits the interconnection application.
Total timeline: 5-8 weeks from signed contract to system activation. Derry has no historic district solar restrictions for standard residential installations.
Three paths to solar in Derry. Each has different economics now that the federal credit is gone.
~$24,000 upfront. All NEM credits and property tax savings go to you. Best long-term value with ~8.5-year payback.
25-year savings: ~$72,607
$0 down, 6-8% APR typical. You own the system and keep NEM credits. Monthly payments $180-$260 for 15-20 year terms. NH has no special subsidized loan program.
Total cost with interest: ~$33K-$40K
$0 down. Financing company claims 48/48E (30%) — deadline July 4, 2026. You get reduced electricity cost. You do not own the system.
Monthly: ~$110-$170 (fixed PPA rate)
Solar panels in Derry NH cost $2.85-$3.15 per watt installed in 2026, averaging about $3.00/W. For a typical 8 kW system, that is $22,800-$25,200 with an average of $24,000. There is no federal tax credit (25D expired December 31, 2025) and no NH state rebate (SB 303 repealed it). The price you see is the price you pay.
Yes. Derry has adopted RSA 72:62, which exempts solar energy systems from local property tax assessment. Your solar system adds $0 to your assessed home value. This saves approximately $584 per year based on a typical 8 kW system adding ~$15,000 in value at Rockingham County mill rates. This is a permanent exemption with no expiration.
Derry is in Eversource NH territory with residential rates averaging $0.25/kWh. Under NEM 2.0, solar credits are approximately $0.21/kWh (about 85% of retail). The NEM 2.0 formula is 100% supply + 100% transmission + 25% distribution. Credits roll over monthly indefinitely, with cash-out at the $100 threshold. Rates are locked through January 1, 2041.
A cash-purchased 8 kW system in Derry pays back in approximately 9-10 years. This factors in $0 federal tax credit, $0 state rebate, NEM 2.0 credits at ~$0.21/kWh, property tax exemption savings of $584/year, and 2.5% annual rate escalation. After payback, you generate free electricity for the remaining 15+ years of panel life.
No, if you buy with cash or a loan. Section 25D (the 30% residential solar ITC) expired December 31, 2025. However, if you go with a third-party owned system (PPA or lease), the financing company can still claim Section 48/48E (30%) on systems that begin construction before July 4, 2026. The TPO provider passes some of that savings to you as a lower rate.
Statewide costs, NEM 2.0, and payback analysis
Largest NH city, $2.85-$3.20/W
MA border advantage, $2.90-$3.25/W
Seacoast premium, $2.95-$3.30/W
Statewide pricing: $2.85-$3.25/W
Compare financing options post-ITC
See exactly what solar costs for your Derry home. We factor in Eversource rates, NEM 2.0 credits, property tax exemption, your roof, and Community Power participation. No ITC padding — just real 2026 numbers.
Serving Derry, Londonderry, Windham, Chester, and the I-93 corridor