Boston Solar Overview
Despite its northern location and reputation for harsh winters, Boston is one of America's best solar markets. According to EIA data, Eversource rates average $0.25-0.32/kWh—among the highest in the country. Excellent state incentives through the SMART program and strong net metering make solar economics extremely favorable for Greater Boston homeowners.
Eversource Programs
Eversource Net Metering
Eversource, the primary utility in Greater Boston, offers net metering for solar customers:
- Full retail credit: Excess generation credited at full retail rate
- Monthly rollover: Credits carry forward
- Annual settlement: At avoided cost (timing varies)
- System size limit: No practical limit for residential
Eversource Rate Details
| Rate Component | Details |
|---|---|
| Average Rate | ~$0.25-0.32/kWh |
| Net Metering Credit | Full retail rate |
| Fixed Charges | ~$7-10/month |
| Rate Trend | Rising (natural gas dependent) |
Massachusetts SMART Program
The Solar Massachusetts Renewable Target (SMART) program is one of the best state solar incentive programs in the country. It provides performance-based payments for the solar your system produces.
How SMART Works
- Performance payments: $/kWh payment for electricity produced
- 10-year term: Locked-in rate for decade
- Block structure: Earlier blocks have higher rates
- Adders: Additional payments for batteries, low-income, etc.
Federal Tax Credit (2026 Update)
| Purchase Type | Federal Credit | Notes |
|---|---|---|
| Cash/Loan Purchase | None (25D expired) | Ended Dec 31, 2025 |
| PPA/Lease | 30% (48E) | Through Dec 2027 |
Costs & Savings in Boston
Typical System Costs
| System Size | Gross Cost | Est. Annual Savings* |
|---|---|---|
| 5 kW | $16,000-18,000 | $1,400-1,800 |
| 7 kW | $22,000-25,000 | $1,900-2,500 |
| 10 kW | $32,000-36,000 | $2,700-3,500 |
*Includes electricity savings + SMART payments (varies by block)
Savings Breakdown
- Electricity offset: $250-350/year per kW (at high Eversource rates)
- SMART payments: $50-150/year per kW (varies by block)
- Total value: $300-500/year per kW
- Payback period: 5-8 years
- 25-year savings: $35,000-60,000
Boston-Specific Considerations
Historic Homes & Permitting
Boston's many historic neighborhoods may have additional considerations:
- Historic districts: May require Historic Commission approval
- Visibility restrictions: Some areas limit street-visible panels
- Flat roofs: Common in Boston; often easier for solar (no visibility concerns)
- Triple-deckers: Shared buildings require owner/HOA coordination
Climate Factors
- Winter: Production drops but panels are efficient in cold
- Snow: Moderate; typically self-clears from tilted panels
- Nor'easters: Panels are resilient but ensure proper installation
- Salt air: Coastal areas—check panel warranties for salt corrosion
Urban Shading
Dense urban areas may have shading from neighboring buildings. Professional shading analysis is essential—don't rely solely on satellite imagery for Boston's varied building heights.
The Bottom Line
Boston is one of the best solar markets in America. High electricity rates, SMART incentives, and strong net metering create exceptional economics despite the northern location. 5-8 year payback periods are typical—among the fastest in the country.
Best candidates: Almost any Boston homeowner with a suitable roof. High electricity costs mean even moderate-production systems deliver strong returns. The SMART program rewards early adopters in each block.
Act early: SMART block rates decrease over time. Getting in an earlier block locks in higher incentive rates for 10 years. Waiting may mean lower per-kWh payments.
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