Connecticut Solar Savings Calculator: Real Math for 2026
Most solar savings estimates are wildly inflated — they include the expired federal ITC, assume retail net metering CT no longer offers, and ignore the Solar Energy Adjustment. We'll walk through exact numbers for 6kW, 10kW, and 14kW systems using actual 2026 CT rates.
Important for 2026: The residential federal solar tax credit (Section 25D, 30%) expired December 31, 2025 and has not been renewed. Any quote or calculator showing a 30% federal credit for a residential system is out of date. Homeowners installing in 2026 should not count on this credit.
How We Calculate CT Solar Savings
Every number in our examples is derived from publicly available data: Eversource's current rate schedule, PURA's published RRES tariff values, and NREL PVWatts production estimates for Connecticut (derate factor 0.82, 5.1 peak sun hours equivalent annual yield).
3 Worked Examples
Click through each scenario. All assume RRES Netting (standard residential tariff), Eversource territory, no battery, and no federal ITC.
6kW System
Step-by-step math
10kW System
Step-by-step math
14kW System
Step-by-step math
Quick Reference: CT Solar Savings by System Size
Ranges reflect variation in roof orientation, shading, and self-consumption ratio. No federal ITC included.
| System size | Production/yr | Annual savings | Payback | 25-yr savings |
|---|---|---|---|---|
| 4kW | 4,600 kWh | $800–$950 | 13–15 yrs | $20k–$24k |
| 6kW | 6,900 kWh | $1,200–$1,450 | 12–14 yrs | $30k–$36k |
| 8kW | 9,200 kWh | $1,700–$2,000 | 12–14 yrs | $42k–$50k |
| 10kW | 11,500 kWh | $2,100–$2,500 | 12–15 yrs | $52k–$63k |
| 12kW | 13,800 kWh | $2,500–$3,000 | 13–15 yrs | $62k–$75k |
| 14kW | 16,100 kWh | $2,900–$3,400 | 13–16 yrs | $72k–$85k |
Why Online Calculators Give Inflated Numbers
We've reviewed a dozen CT solar savings calculators. Here are the five most common sources of overestimation:
They include the federal ITC
The residential federal solar tax credit (Section 25D) expired December 31, 2025. Most calculators still subtract 30% from system cost. That's a $7,000–$14,000 error for a typical CT system.
They assume 3–5% annual rate escalation
CT electricity rates have risen, but compounding 5% annually over 25 years turns a $3,000/yr savings into $140k+. Our math uses flat 2026 rates — conservative and honest.
They ignore the Solar Energy Adjustment
Eversource charges solar customers $0.0402/kWh on electricity still pulled from the grid. A typical home pays $200–$350/year in this surcharge, which most calculators omit entirely.
They use net metering rates that CT no longer offers
CT replaced standard net metering with RRES. Exports under RRES Netting are credited at ~$0.078/kWh (wholesale), not $0.25/kWh (retail). That gap dramatically overstates export value.
They assume 100% self-consumption
Most homes export 40–60% of their solar production. Crediting all production at the retail rate ignores the wholesale value of exported kWh — an overstatement of $0.17/kWh on exports.
Factors That Affect Your Actual Savings
| Factor | Impact on savings | Direction |
|---|---|---|
| Roof orientation | South-facing roofs produce ~20% more than east/west splits | ↑ |
| Shading | Even partial shade can cut production 15–30% | ↓ |
| Self-consumption ratio | Homes with EVs or daytime occupants self-consume 60–70% vs 40% for empty houses | ↑ |
| Electricity rate plan | Time-of-use plans can boost savings 10–20% if you shift loads to evenings | ↑ |
| Battery storage | A battery raises self-consumption by 15–25%, improving export economics | ↑ |
| Solar Energy Adjustment | $0.0402/kWh surcharge on all grid imports for solar customers | ↓ |
| Panel degradation | ~0.5%/yr loss — after 25 years your system produces ~12% less than year one | ↓ |
| RRES tariff changes | PURA adjusts RRES rates annually; future rate changes affect long-term projections | ↔ |
How to Maximize Your CT Solar Savings
Add battery storage
CT's Energy Storage Solutions program offers up to $16,000 for battery systems. A battery stores midday solar production and uses it at night — raising self-consumption from 45% to 65%+ and reducing expensive grid imports.
Shift loads to daytime
Running dishwashers, laundry, and EV charging during peak solar production hours (10am–3pm) raises self-consumption without spending a dollar on batteries.
Compare RRES Netting vs Buy-All
Homeowners with very large systems or commercial properties should evaluate RRES Buy-All, which pays $0.3289/kWh for all production — more than retail in some cases.
Size for self-consumption
Don't over-build just to export more. Exported kWh earn ~$0.078 vs $0.252 saved through self-consumption. Right-sizing to your daytime load optimizes your payback period.
Frequently Asked Questions
How much does a 10kW solar system save in Connecticut per year?
Why does my solar quote show much higher savings than your calculator?
Does Connecticut solar savings depend on which utility I have?
What is the Solar Energy Adjustment and does it reduce my savings?
Should I size my system to eliminate my entire electric bill?
Get a Quote Based on Real CT Numbers
Our solar team uses current RRES tariff values, actual Eversource rates, and your home's specific shading data — not generic national averages.
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