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Connecticut has some of the highest electricity rates in America (~29–32¢/kWh). Here's how Rate 7 TOU pricing, the ESS battery program, and smart self-consumption can turn that into $2,500–$4,000/year in savings and revenue.
Both Eversource (Rate 7) and United Illuminating (Rate RT) offer time-of-use rates with peak hours from noon to 8 PM on weekdays. The TOU spread is modest (~3.5¢/kWh on generation), but the real battery value in CT comes from the ESS program: up to $250/kWh upfront + $225/kW/year in demand response payments. Combined with self-consumption savings and TOU arbitrage, a 10 kW battery earns $2,500–$3,500/year.
Both CT utilities share the same peak window but differ slightly in supply rates. Delivery charges (~15.5¢/kWh) are added to both.
Rate 7 (Time-of-Day) — Hartford, central, north, and east CT
Peak (All-In)
30.7¢
Mon–Fri, Noon–8 PM
Off-Peak (All-In)
27.2¢
Nights + Weekends
Rate RT (Time-of-Day) — New Haven, Bridgeport, southwest CT
Peak (All-In)
31.8¢
Mon–Fri, Noon–8 PM
Off-Peak (All-In)
28.3¢
Nights + Weekends
Your battery charges from free solar during the day and discharges during expensive peak hours — while also earning ESS demand response payments on top.
8 AM – Noon
Solar panels generate power. Battery charges from solar (off-peak hours).
Noon – 8 PM
Peak hours begin. Battery discharges to power your home instead of buying expensive grid power.
Peak Export
Excess solar exports during peak earn slightly higher TOU credit value from your utility.
ESS Events
During summer DR events (3–8 PM), your battery dispatches to the grid and you earn $200–$225/kW.
TOU arbitrage is just one piece. In Connecticut, the ESS program and self-consumption savings dwarf the TOU spread — making batteries a strong investment even with a modest peak/off-peak differential.
ESS Upfront Incentive
Up to $16,000 day-one rebate depending on income tier. No solar required.
ESS Demand Response
$200/kW summer + $25/kW winter. Drops to $130/kW/yr for years 6–10.
Self-Consumption Savings
Use stored solar instead of buying from grid at 28–32¢/kWh.
TOU Arbitrage
Charge off-peak, discharge peak. ~3.5¢/kWh spread on generation.
RRES Adjustment Offset
Self-consuming more solar reduces exposure to the $0.0402/kWh charge.
Select your utility and battery size to see the full value breakdown.
See your full value stack with TOU + ESS
Eversource TOU Rates
Peak (12–8 PM)
30.7¢
Off-Peak
27.2¢
Spread
3.5¢
Annual Value Breakdown (Year 1)
Cumulative Value
ESS Upfront
$3,375
Day 1 incentive
5-Year Total
$22,632.5
Upfront + annual
10-Year Total
$36,427.5
Full ESS term
Estimates based on Rate 7 (Time-of-Day) rates (Jan–Jun 2026) and ESS Step 1 standard tier incentives. Actual values depend on usage patterns, solar production, and dispatch frequency.
Connecticut replaced ConnectedSolutions with the ESS program in late 2023. It offers both upfront incentives and ongoing annual payments — a dual benefit no other NE state matches at this level.
| Tier | Per kWh | 13.5 kWh Example |
|---|---|---|
| Standard | $250 | $3,375 |
| Underserved Community | $450 | $6,075 |
| Low-Income | $600 | $8,100 |
Max $16,000 or 50% of battery + install cost.
| Period | Summer | Winter | Total |
|---|---|---|---|
| Years 1–5 | $200/kW | $25/kW | $225/kW |
| Years 6–10 | $115/kW | $15/kW | $130/kW |
Starting January 1, 2026, new RRES enrollees pay a $0.0402/kWh Solar Energy Adjustment on all solar production — an 8× increase from the legacy $0.005/kWh rate. For a typical 11 kW system producing ~12,925 kWh/year, that's approximately $520/year in new charges.
A battery helps offset this by increasing self-consumption. Solar energy used directly in your home (or stored in your battery for later use) avoids the export-reimport cycle that triggers the full adjustment. Depending on battery size, this can save $100–$250/year just from reducing RRES adjustment exposure.
New 2026 Enrollees
4.02¢/kWh
~$520/yr for 11 kW system
Legacy (Pre-2026)
0.50¢/kWh
Grandfathered through 2039
All figures assume Eversource CT Rate 7, standard-tier ESS incentive, and 11 kW solar system.
Enphase IQ 5P
5 kW / 5 kWh
Enphase IQ 10T
10 kW / 10 kWh
Tesla Powerwall 3
11.5 kW / 13.5 kWh
These batteries are compatible with the CT ESS program for both upfront incentives and demand response.
Tesla Powerwall 3
13.5 kWh / 11.5 kW
Most popular, integrated inverter
ESS incentive: $3,375
Tesla Powerwall 2
13.5 kWh / 5 kW
AC-coupled, legacy model
ESS incentive: $3,375
Enphase IQ Battery 5P
5 kWh / 3.84 kW
Modular, pairs with Enphase microinverters
ESS incentive: $1,250
Enphase IQ Battery 10T
10.08 kWh / 3.84 kW
Larger Enphase option
ESS incentive: $2,520
SolarEdge Home Battery
9.7 kWh / 5 kW
DC-coupled, SolarEdge ecosystem
ESS incentive: $2,425
Franklin WH aPower
13.6 kWh / 5 kW
Whole-home backup capable
ESS incentive: $3,400
Generac PWRcell
9 kWh / 4.5 kW
Scalable 3–18 kWh
ESS incentive: $2,250
sonnen ecoLinx
12 kWh / 8 kW
Premium smart home integration
ESS incentive: $3,000
CT Green Bank's Smart-E Loan offers 0.99% APR financing for up to $50,000 (through March 31, 2026) covering both solar and battery installations. Combined with the ESS upfront incentive, many homeowners see a net-positive cash flow from year one. This is one of the lowest clean energy financing rates in the country.
Get a personalized solar+battery quote with ESS incentives, TOU optimization, and Smart-E financing options tailored to your Connecticut home.