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Groton solar costs $2.80–$3.10 per watt in 2026. A typical 9 kW system runs $25,200–$27,900. The Submarine Capital of the World has dual utility territory (Eversource + Groton Utilities), a large military/Electric Boat workforce, and coastal zones along the Thames River and Long Island Sound.
Avg Cost/Watt
$2.95/W
9 kW System
~$26,550
Federal ITC
$0
Cash Payback
9-11 yr
Federal Residential Solar Tax Credit (Section 25D) Expired December 31, 2025
Groton homeowners who purchase solar with cash or a loan receive $0 in federal tax credits. All prices below reflect what you actually pay. PPA/lease providers can still claim Section 48/48E (30%) through July 4, 2026. Is solar still worth it?
Groton Has Two Electric Utilities
Most of Groton (Town) is served by Eversource (~$0.27/kWh, RRES program). The City of Groton borough is served by Groton Utilities (~$0.22/kWh, different interconnection rules). Verify your utility before getting quotes. The numbers below are based on Eversource territory.
Key numbers for Groton homeowners considering solar in 2026 (Eversource territory).
9 kW
Avg System Size
$0.27/kWh
Eversource CT Rate
10,575
kWh/Year Production
~$2,810
Year 1 Savings
Groton’s submarine base, Electric Boat workforce, and dual utility territory create a solar market unlike any other in Connecticut.
Naval Submarine Base New London and Electric Boat employ thousands in Groton. Military families considering solar need to factor in potential PCS moves. PPA/lease contracts transfer to new homeowners, while cash purchases boost resale value — both are viable.
Most Groton addresses are Eversource ($0.27/kWh, RRES program). City of Groton addresses use Groton Utilities (~$0.22/kWh) with different net metering rules. This distinction affects savings calculations significantly — always verify your utility first.
Eastern CT labor costs keep Groton solar at $2.80–$3.10/W — significantly below Fairfield County prices. The analytical Electric Boat engineering community demands transparent pricing, which keeps the local installer market competitive and honest.
Groton prices reflect eastern CT labor rates and Eversource CT territory ($0.27/kWh). Groton Utilities customers may see different economics.
| System Size | Price Range | After Sales Tax Exemption |
|---|---|---|
| 5 kW | $14,000–$15,500 | $13,063–$14,563(-$937 saved) |
| 7 kW | $19,600–$21,700 | $18,289–$20,389(-$1,311 saved) |
| 9 kWMOST COMMON | $25,200–$27,900 | $23,514–$26,214(-$1,686 saved) |
| 11 kW | $30,800–$34,100 | $28,739–$32,039(-$2,061 saved) |
| 14 kW | $39,200–$43,400 | $36,577–$40,777(-$2,623 saved) |
Prices as of March 2026. Based on Groton-area installer data. Sales tax exemption (6.35%) via Form CERT-140. No federal 25D ITC ($0). No CT state income tax credit. Eversource territory assumed.
What Groton homeowners (Eversource territory) actually pay and earn from a 9 kW system.
Plus $1,686 upfront sales tax savings. Groton Utilities customers: different rates apply — contact GU directly.
The $0.0402/kWh Solar Energy Adjustment
New 2026 RRES enrollees (Eversource only) pay $0.0402/kWh on all solar production. On a 9 kW system this costs ~$425/yr. Groton Utilities customers are NOT subject to this adjustment — they follow municipal rules. Full RRES guide
Highest long-term savings. ~$24,864 net cost after sales tax exemption. 9–11 year payback. Best for homeowners planning to stay 5+ years.
25-year savings: ~$55,000–70,000+
$0 down, 6.99–7.99% APR through CT Green Bank. Can bundle roof repairs (up to 25%). Good for preserving cash. NOT 0.99% for solar.
Smart-E details →$0 upfront. Third-party owner claims Section 48/48E (30%) through July 4, 2026. Ideal for military families expecting PCS moves — contract transfers to new homeowner.
Compare options →Groton has two distinct electric utilities with different rates, programs, and interconnection procedures. Know which one you have.
Serves Town of Groton (majority)
Serves City of Groton (borough)
Municipal utilities set their own solar policies. Contact Groton Utilities directly for current net metering rates and interconnection procedures.
No federal ITC and no state income tax credit, but two CT exemptions save Groton homeowners thousands.
~$1,686
~$380/yr
Groton receives the standard ESS incentive of $250/kWh (Eversource customers only). Groton Utilities customers should check municipal battery policies separately.
Groton’s military community, dual utility territory, and coastal location create unique dynamics for solar installations.
Groton is unique in CT: most areas are served by Eversource (~$0.27/kWh), but the City of Groton borough is served by Groton Utilities — a municipal electric company with different rates (~$0.22/kWh) and interconnection rules. Always verify which utility serves your address before getting solar quotes. RRES rules differ between the two.
With Naval Submarine Base New London and Electric Boat (General Dynamics), Groton has a large military and defense contractor population. Many military families face PCS (permanent change of station) moves every 2-4 years. Solar with a PPA/lease may be a better fit than cash purchase for active-duty families who may relocate.
Groton Long Point, Noank, and Thames River-facing properties require marine-grade stainless steel mounting hardware. Salt air corrosion is a real concern on the shoreline. Budget an extra $500-1,500 for coastal-rated equipment. Wind load engineering may also be required for exposed sites.
Eastern Connecticut labor rates are among the most competitive in the state — 15-20% lower than Fairfield County. New London County-based installers serve Groton efficiently with minimal travel costs. This keeps per-watt pricing at $2.80-$3.10/W, well below premium markets like Stamford.
Electric Boat employs 17,000+ workers in Groton — many are engineers and skilled tradespeople who evaluate solar analytically. This well-educated buyer base demands transparent pricing and high-quality equipment. The competitive dynamics help keep installer pricing honest.
Groton's median home value is moderate compared to shoreline towns like Guilford or Madison. At an effective mill rate of ~1.60%, a 9 kW system saves roughly $380/yr in avoided property taxes. While less dramatic than premium markets, the permanent exemption still adds ~$9,500 over 25 years.
Solar pricing varies across Groton due to coastal exposure, utility territory, housing type, and military community needs.
Exclusive waterfront community on Long Island Sound. Salt air and coastal wind loads require marine-grade mounting hardware. Seasonal and year-round homes with high electric bills. Premium area with strong solar ROI potential.
Historic village straddling the Groton/Stonington line. Groton-side homes near Mystic Seaport have charming character. Mix of colonial and newer construction. Tourism traffic means some installers charge access premiums.
Residential neighborhood near Electric Boat and the Naval Submarine Base. Many military families and EB employees. Affordable ranch and colonial homes with simple rooflines ideal for solar. Groton Utilities may serve some addresses.
Central residential area with diverse housing stock. Close to Route 12 and town amenities. Mix of single-family homes and some multi-family. More affordable entry point for solar at $2.80-$2.95/W.
Charming fishing village on the coast. Tight-knit community with waterfront and near-waterfront homes. Some properties face Morgan Point or the Thames River. Coastal considerations similar to Groton Long Point but with smaller lots.
Small area served by Groton Utilities — a municipal electric company with DIFFERENT interconnection rules than Eversource. Typically lower rates (~$0.22/kWh) but also different net metering policies. Verify your utility before signing a contract.
Groton’s Building Department handles residential solar permits. Most permits are processed within 1–2 weeks.
Submit through Groton Building Department. Standard residential solar permits are issued in 1–2 weeks. Your installer handles all paperwork including structural calculations. Note: properties on or near the submarine base may have additional security considerations.
Waterfront properties in Groton Long Point, Noank, and along the Thames River may need Coastal Area Management (CAM) review. Most residential rooftop installations are approved without additional review unless in a flood zone.
Groton electrical inspector signs off on the installation. Typically scheduled within 1 week of completion. If your panel needs a 200A upgrade, this is inspected simultaneously.
Eversource: RRES enrollment and meter configuration, 4–8 weeks after inspection. Groton Utilities: Municipal interconnection process — contact GU directly for current timelines and requirements (860-446-4000).
Total timeline: Groton solar installations typically take 8–14 weeks from signed contract to permission to operate (PTO) for Eversource customers. Groton Utilities timeline may vary.
Calculate your personalized Groton solar payback. Adjust system size, cost per watt, and financing type. Note: defaults assume Eversource territory ($0.27/kWh).
Estimate your solar return on investment with RRES income, CT tax exemptions, and ESS battery incentives.
Federal Residential Solar Tax Credit (Section 25D) Expired
Homeowners who purchase solar with cash or a loan receive $0 in federal tax credits. Section 25D expired December 31, 2025.
Hartford, most of CT (north, east, central)
New 2026 enrollees pay $0.0402/kWh Solar Energy Adjustment on all production
Electric Rate
$0.29/kWh
RRES Program
Netting Tariff
Solar Energy Adj.
$0.0402/kWh
Interconnection
4-8 weeks
Permanent exemption — solar adds $0 to your property tax bill
Payback
7.6
years
25-Year Savings
$133,649
total
Monthly
$323
per month
Estimates based on average 2026 CT solar pricing, RRES netting tariff at retail rate, $0.0402/kWh Solar Energy Adjustment, 6.35% sales tax exemption, permanent property tax exemption (~2.04% effective rate), and ESS incentive at $250/kWh standard tier. Section 25D residential ITC expired Dec 31, 2025 — $0 federal tax credit for cash/loan purchases. CT has no state income tax credit for solar.
Solar panels in Groton cost $2.80-$3.10 per watt in 2026. A typical 9 kW system runs $25,200-$27,900. The average installed price is about $2.95/W or $26,550 for 9 kW. Most of Groton is in Eversource CT territory ($0.27/kWh), but the City of Groton borough is served by Groton Utilities (~$0.22/kWh). There is no federal 25D tax credit (expired December 31, 2025).
Most of Groton (Town of Groton) is served by Eversource CT at ~$0.27/kWh. However, the City of Groton (a small borough within the town) is served by Groton Utilities — a municipal electric company with lower rates (~$0.22/kWh) and different interconnection/net metering rules. Always verify which utility serves your specific address before signing a solar contract.
It depends on your timeline. If you plan to stay 5+ years, a cash purchase or loan makes financial sense with 9-11 year payback. If you expect a PCS move within 2-4 years, a PPA or lease ($0 upfront) may be better — the agreement transfers to the new homeowner when you sell. Solar increases home resale value, which benefits military sellers. Talk to your installer about PCS-friendly contract terms.
Groton Utilities (municipal) has its own net metering policy separate from Eversource's RRES program. Municipal utilities in CT are NOT required to follow the same RRES tariff as investor-owned utilities. Groton Utilities may have different credit rates, system size limits, and interconnection procedures. Contact Groton Utilities directly (860-446-4000) to confirm current solar policies before committing.
For Eversource customers with a cash purchase, Groton solar pays back in approximately 9-11 years. A 9 kW system produces ~10,575 kWh/yr, generating ~$2,422/yr in net RRES credits (after $425 Solar Energy Adjustment) plus ~$380/yr in property tax savings. Groton Utilities customers may see different payback due to lower rates ($0.22/kWh vs $0.27/kWh).
No. Groton is NOT designated an economically distressed municipality by CT DECD. Groton receives the standard ESS battery incentive of $250/kWh, not the $450/kWh underserved tier. A 13.5 kWh battery in Groton receives $3,375 in ESS incentives. Note: ESS incentives apply only to Eversource customers — Groton Utilities customers should check their municipal battery policies separately.
Waterfront properties in Groton Long Point, Noank, and along the Thames River should use marine-grade stainless steel or hot-dipped galvanized mounting hardware. Salt air corrosion degrades standard aluminum racking within 5-10 years on exposed coastal sites. Budget an extra $500-1,500 for coastal-rated equipment. The extra cost is justified by 25 years of reliable production.
Statewide pricing and city comparison
Netting vs Buy-All tariffs explained
Utility comparison for solar
Solar financing options in CT
6.99-7.99% APR, NOT 0.99%
ESS incentives and ROI analysis
Sales tax + property tax savings
Shoreline town, Eversource, large lots
UI territory, Yale area, ESS $450/kWh
Fairfield County, Eversource territory
See exactly what solar costs for your Groton home. We factor in your utility (Eversource or Groton Utilities), your roof, RRES program, property tax savings, and all CT exemptions. No ITC fluff — just real 2026 numbers.
Serving Groton, Mystic, New London, and southeastern CT