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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
~8.1 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 NH state rebate was also permanently repealed (SB 303).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 $0.292/kWh all-in. NEM 2.0 credits are approximately $0.20/kWh (~69% 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 | ~8.1 yr |
| Salem | $2.85-$3.20/W | $24,200 | ~7.8 yr |
| Derry | $2.85-$3.15/W | $24,000 | ~7.8 yr |
| Manchester | $2.85-$3.20/W | $24,200 | ~7.9 yr |
| Nashua | $2.90-$3.25/W | $24,600 | ~8.0 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.
NREL's SolarTRACE dataset is the closest thing this country has to an audited record of how long residential solar approvals take. It publishes a jurisdiction only once that jurisdiction has around ten completed rooftop projects in a reporting year, and Windham does not clear that bar in any year of the New Hampshire file. That is a statement about volume, not about competence — a town of some 15,000 people with a two-acre minimum lot size in most districts simply does not generate that many installs. It also means nobody can honestly quote you a measured Windham permit median, and we are not going to invent one.
What the file does contain is the ring of towns around Windham — and the reason that is worth a table rather than a sentence is that those three neighbours are served by 3 different electric utilities between them.
| Neighbouring town | Utility of record | Cohort | Town permit review | Utility pre-install review | Inspection wait | Final IX → PTO |
|---|---|---|---|---|---|---|
| Derry | New Hampshire Elec Coop Inc (NHEC) | 2023 · 18 installs | 5 d | 13.5 d | 10 d | 17 d |
| Derry | Public Service Co of NH (PSNH / Eversource) | 2023 · 18 installs | 5 d | 15 d | 10 d | 6 d |
| Hudson | Public Service Co of NH (PSNH / Eversource) | 2023 · 24 installs | 0 d | 15 d | 6 d | 6 d |
| Salem | Liberty Utilities (LU, Granite State Electric) | 2023 · 10 installs | 5 d | 7.5 d | not reported | 9 d |
| New Hampshire, all jurisdictions | 2024 · 308 installs | 11 d | 1 d | 10 d | 4 d | |
Salem is served by Liberty Utilities. Hudson is Eversource. Derry appears under both Eversource and New Hampshire Electric Cooperative. Drive fifteen minutes in three directions from Windham and the answer to “who is my utility?” changes three times — along with the net-metering credit rate and whether Community Power Coalition aggregation is even available, since NHEC is the one New Hampshire electric utility outside it. Confirm the name on your own bill before applying any figure from a neighbour's quote.
Every surrounding jurisdiction in the file clears plan review faster than the eleven-day New Hampshire median — Hudson at zero days, Salem and Derry at five. This corner of Rockingham and Hillsborough county is quick on municipal paperwork. The variance sits with the utility phases, where Derry's cooperative rows carry a 17-day close-out to permission-to-operate against six on Eversource. None of this is a Windham measurement, and it should not be presented to you as one; it is the best available evidence about the immediate area.
Source: NREL SolarTRACE Dataset v9-9-2025 (data.nlr.gov), median timelines for 0-10kW residential PV. Rows shown are for the named neighbouring jurisdictions, read from the dataset at page-render time; no value is imputed to Windham. Install counts are per jurisdiction-year, so the same total repeats against each utility serving that jurisdiction.
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 ~8.1-year payback.
25-year savings: ~$88,207
$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, where the all-in bundled residential rate is $0.292/kWh. Under NEM 2.0, solar credits are approximately $0.20/kWh (about 69% 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 8.1 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.
No, and that is worth knowing rather than glossing over. NREL's SolarTRACE dataset publishes median approval timelines for jurisdictions that record roughly ten or more completed residential rooftop projects in a reporting year, and Windham does not appear in the New Hampshire file at all. That is a volume signal, not a quality one: Windham is a town of about 15,000 with a two-acre minimum lot size in most districts, so a handful of installs a year is unsurprising. The practical consequence is that no one — including us — can quote you a measured Windham permit median. What the dataset does contain is the towns immediately around Windham, and those are useful precisely because they are not uniform.
Ask rather than assume, because the corner of New Hampshire Windham sits in is served by three different utilities within a few miles. Of the neighbouring towns that do appear in the federal permitting record, Salem is served by Liberty Utilities, Hudson by Eversource, and Derry by both Eversource and New Hampshire Electric Cooperative. Those are not interchangeable: NHEC is a member-owned cooperative with its own net-metering credit rate and is the one New Hampshire electric utility outside Community Power Coalition aggregation, while Liberty and Eversource are investor-owned utilities operating under the NHPUC's NEM 2.0 framework. The name on your bill decides which credit rate and which community-power option apply to you.
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