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NuWatt designs, installs, and manages solar, battery, heat pump, and EV charger systems across 9 states. One company, one warranty, one point of contact.
Get a Free QuoteWindham solar costs $2.95–$3.15 per watt in 2026. A typical 9 kW system runs $26,550–$28,350. As one of NH's most affluent suburbs near Salem and Derry, Windham offers large colonial homes with excellent roof area and fast permitting.
Avg Cost/Watt
$3.05/W
9 kW System
~$27,450
Federal ITC
$0
Cash Payback
~8.8 yr
Federal Residential Solar Tax Credit (Section 25D) Expired December 31, 2025
Windham 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 NH state rebate was also permanently repealed (SB 303).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
Windham pricing reflects Eversource NH territory and the town's suburban installer market. No federal ITC, no state rebate — these are real 2026 out-of-pocket costs.
| System Size | Price Range |
|---|---|
| 5 kW | $14,750–$15,750 |
| 7 kW | $20,650–$22,050 |
| 9 kWMOST COMMON | $26,550–$28,350 |
| 11 kW | $32,450–$34,650 |
| 13 kW | $38,350–$40,950 |
Prices as of March 2026. Based on Windham-area installer data and EnergySage NH marketplace. No federal 25D ITC ($0). No NH state rebate (SB 303). No state sales tax (NH advantage).
Windham's Eversource territory, property tax exemption, large lots, and newer housing stock shape the solar economics.
Windham 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. NEM rates are locked through 2041 under Docket DE 16-576.
Windham has adopted RSA 72:62, exempting solar energy systems from property tax. With Windham's high assessments (median home ~$550K), this exemption is especially valuable. Your solar system adds $0 to your assessed value, saving approximately $700/year.
Windham is one of NH's most affluent suburbs with large colonial and contemporary homes built in the 1990s-2010s. Most homes have 200A electrical panels and substantial south-facing roof area, making solar installations straightforward and cost-effective.
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.
Windham zoning requires minimum 2-acre lots in most areas. This means large homes with expansive roofs and minimal shading from neighboring structures. Ground-mount systems are also viable on many Windham properties.
Windham has a streamlined permit process with online submissions. Typical residential solar permits are approved within 7 business days. No historic district overlay, no special restrictions. Combined with Eversource interconnection, total timeline is 5-9 weeks.
How a 9 kW cash-purchased system pays back in Windham 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.
Windham sits between Salem, Derry, and the Manchester metro. All are in Eversource territory except Salem (Liberty). Windham's higher assessments make the property tax exemption especially valuable.
| Town | Cost/W | 9 kW Avg | Payback |
|---|---|---|---|
| WindhamYOU ARE HERE | $2.95-$3.15/W | $24,400 | ~9.2 yr |
| Salem | $2.85-$3.20/W | $24,200 | ~9.5 yr |
| Derry | $2.85-$3.15/W | $24,000 | ~9.3 yr |
| Manchester | $2.85-$3.20/W | $24,200 | ~9.3 yr |
| Nashua | $2.90-$3.25/W | $24,600 | ~9.5 yr |
Windham's property tax exemption is worth more than Derry or Salem due to higher home assessments. Salem uses Liberty Utilities with a slightly lower rate ($0.24/kWh), which affects NEM credit value.
Windham has one of the fastest and simplest permitting processes in southern NH. Online permit portal, no historic district overlay, and no special restrictions for residential solar.
Your installer submits plans through Windham's online portal. Combined building and electrical permit. Typical approval: 5-7 business days. Fee: $50-$100.
Physical installation of panels, inverter, and electrical connections. Most Windham homes with standard asphalt shingle roofs are completed in 1 day. Larger 11-13 kW systems may take 2 days.
Windham building inspector signs off on the installation. Typically scheduled within 3-5 business days of completion. No separate electrical permit needed.
NEM 2.0 enrollment and bi-directional meter installation. Takes 2-4 weeks after passing inspection. Your installer submits the interconnection application.
Total timeline: 5-9 weeks from signed contract to system activation. Windham has no historic district restrictions and no separate electrical permit requirement, making it one of the fastest towns in NH for solar.
Three paths to solar in Windham. Each has different economics now that the federal credit is gone.
~$27,450 upfront. All NEM credits and property tax savings go to you. Best long-term value with ~8.8-year payback.
25-year savings: ~$78,739
$0 down, 6-8% APR typical. You own the system and keep NEM credits. Monthly payments $210-$300 for 15-20 year terms. NH has no special subsidized loan program.
Total cost with interest: ~$38K-$47K
$0 down. Financing company claims 48/48E (30%) — deadline July 4, 2026. You get reduced electricity cost. You do not own the system.
Monthly: ~$130-$200 (fixed PPA rate)
Solar panels in Windham NH cost $2.95-$3.15 per watt installed in 2026, averaging about $3.05/W. For a typical 9 kW system, that is $26,550-$28,350 with an average of $27,450. 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. Windham 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. With Windham's high property assessments and tax rate, this saves approximately $700 per year. This is a permanent exemption with no expiration.
Windham 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 9 kW system in Windham pays back in approximately 9.2 years. This factors in $0 federal tax credit, $0 state rebate, NEM 2.0 credits at ~$0.21/kWh, property tax exemption savings of approximately $700/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.
Yes. Windham's 2-acre minimum lot zoning in most areas provides ample space for ground-mount solar arrays. Ground-mount systems cost slightly more ($0.10-$0.20/W premium) but offer optimal tilt angle and easier maintenance. Your installer can assess whether roof-mount or ground-mount is more cost-effective for your specific property.
Statewide costs, NEM 2.0, and payback analysis
Affluent Manchester suburb, $2.95-$3.15/W
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 breakdown
See exactly what solar costs for your Windham home. We factor in Eversource rates, NEM 2.0 credits, property tax exemption, your roof, and lot size. No ITC padding — just real 2026 numbers.
Serving Windham, Salem, Derry, Londonderry, and Greater Southern NH