Interactive Eversource, National Grid & Rhode Island Energy Payout & Bill Modeler
Sourced rates · estimates labeledConnecticut Energy Storage Solutions is a separate program from ConnectedSolutions. Choose the CT track above, or read the official rules at energystoragect.com.
Tariff schedule verified 2026-11-12 against MA DPU Three-Year Energy Efficiency Plan (2025–2027).
Standard basic-service rates in Massachusetts and Rhode Island are often flat, so this calculator does not add daily TOU arbitrage unless a spread is entered. Connecticut closed ConnectedSolutions to new enrollments on December 1, 2023; new CT customers use Energy Storage Solutions ($30/kWh standard-residential upfront and $300/kW performance as of April 1, 2026).
Official Eversource, National Grid & Rhode Island Energy Rate & Payout Schedule (2026)
| Tariff Metric / Tier | Verified Compensation / Rate | Eligibility & Dispatch Conditions | Source |
|---|---|---|---|
| Massachusetts summer performance incentive | $275 per average kW delivered during summer events | Mass Save sponsors. Rate is commonly locked for the first five summers on new systems. | Mass Save battery storage / ConnectedSolutions ↗ Last verified: Nov 12, 2026 |
| Rhode Island summer performance incentive | $225 per average kW; annual cap $6,875 | Rhode Island Energy. First-five-summer rate lock described on the utility page. | Rhode Island Energy ConnectedSolutions battery program ↗ Last verified: Nov 12, 2026 |
| Dispatch window (MA / RI) | June 1–Sept 30, typically 3–8 p.m., no more than 60 events, up to 3 hours | You can opt out of events; opt-outs lower the seasonal average kW. | National Grid Massachusetts ConnectedSolutions ↗ Last verified: Nov 12, 2026 |
| Connecticut (new customers) | Energy Storage Solutions: $30/kWh standard-residential enrollment (from Apr 1, 2026) + $300/kW performance Years 1–10 | Not ConnectedSolutions. ConnectedSolutions closed to new CT enrollments Dec. 1, 2023. Performance is average kW-AC during events. | Energy Storage Solutions program changes (Apr 1, 2026) ↗ Last verified: Nov 12, 2026 |
Every rate above includes a source link. Last verified: Nov 12, 2026. Rows marked Estimate are not copied from a primary tariff sheet.
The Fine-Print Catches: 4 Rules Utility Brochures Bury
The 3-Hour Energy Bottleneck (Why Inverter kW != Payout kW)
A Powerwall 3 has 11.5 kW of inverter capacity, but a 13.5 kWh pack holding a 20% reserve has 10.8 kWh to discharge. Over a 3-hour event that is about 3.2–3.6 kW after losses — not 11.5 kW × $275.
No Daily TOU Rate Arbitrage on Standard MA / RI Tariffs
Standard residential National Grid and Eversource basic service tariffs charge a flat per-kWh rate all day. Unlike California or Georgia, your battery earns $0 on non-event days unless enrolled in a specialized municipal or supplier TOU plan.
Opting Out Hurts Your Entire Summer Average
ConnectedSolutions averages your kW across ALL called summer events. Opting out of 5 hot afternoon events records 0.0 kW for those days, dragging down your entire seasonal payout.
Q4 / Q1 Settlement Lag
Summer performance (June–September) is audited by utilities in autumn and disbursed via your inverter OEM (Tesla, Enphase, SolarEdge, Generac) once per year in winter.
Whitelisted Inverters, Batteries & Enrollment Pathways
| Hardware Ecosystem | Eligible Models | How Enrollment Works | Storage / V2G Class |
|---|---|---|---|
| Enphase Energy | IQ Battery 5P / 10T / 3T | Direct in Enphase App (ConnectedSolutions program flow) | Stationary storage |
| Tesla | Powerwall 3, Powerwall 2, Powerwall+ | Direct in Tesla App -> Virtual Power Plant | Stationary storage |
| SolarEdge / Generac / Sonnen / FranklinWH | SolarEdge Home Battery, PWRcell, core+, aPower (via approved DERMS) | OEM portal + utility meter account match | Select commercial V2G only |
Worked Household Bill Math: Real-World Scenario
Worcester, MA Homeowner — 3x Enphase IQ Battery 5P (15.0 kWh / 11.52 kW AC)
950 kWh/month usage on National Grid Massachusetts (flat retail tariff + 0% Mass Save HEAT Loan).
- Exportable Energy Per Event: 15.0 kWh total capacity x 80% (keeping a 20% backup reserve) = 12.0 kWh available.
- Sustained 3-Hour Average Curtailment: 12.0 kWh / 3.0 hours x 0.90 efficiency = 3.60 kW strict 3-hour floor (rises to ~4.1 kW when 2-hour events are mixed in).
- Annual Massachusetts ConnectedSolutions check at a strict 3-hour floor: 3.60 kW × $275/kW = $990/year. Shorter 2-hour events can raise average kW; this default is conservative.
- Net 10-Year Math (0% Federal 25D Credit): On a $16,800 3x 5P stack, 10 years of ConnectedSolutions ($9,900) covers ~59% of cash cost—or ~76% under a Section 48E lease pass-through.
Frequently Asked Questions (Eversource, National Grid & Rhode Island Energy)
Can I enroll a standalone battery without solar panels in ConnectedSolutions?
Yes. ConnectedSolutions is technology-neutral regarding how the battery charges before an event; standalone batteries in Massachusetts and Rhode Island can charge from the grid prior to 3 p.m.–8 p.m. summer peak dispatches.
Does ConnectedSolutions void my Tesla or Enphase battery warranty?
No. Both Tesla and Enphase officially partner with Eversource, National Grid, and Rhode Island Energy as approved ConnectedSolutions aggregators, and 30–60 summer events stay well within standard 10-to-15-year cycle warranties.
What backup reserve setting maximizes ConnectedSolutions payouts?
Lowering your reserve from 30% to 10% increases your exportable kWh by 28.5%, directly boosting your 3-hour average kW payout while automatic Storm Watch still charges to 100% before NWS severe weather warnings.
Can a new Connecticut customer join ConnectedSolutions?
No. Enphase and the CT program administrator state that Connecticut ConnectedSolutions stopped new enrollments on December 1, 2023. New customers use Energy Storage Solutions, which (for applications on or after April 1, 2026) pays a $30/kWh standard-residential enrollment incentive and $300/kW performance for standard residential customers. See energystoragect.com.
Compare Neighboring & Benchmark US Utility Tariffs
BGE, Pepco, Delmarva Power & Potomac Edison: Maryland DRIVE Act V2G & Home Battery EDSSS Pilots
Maryland PSC-approved DRIVE Act compensation: $300/kW-year nameplate for direct residential standalone storage or bidirectional EVs, $150/kW-year solar-paired storage, and $90/kW-year aggregator reservation plus event pay up to $6/kWh. Payments expected starting summer 2027.
Duke Energy Carolinas & Progress: PowerPair + Monthly Battery Control (Power Manager / EnergyWise)
Calculate 2026 Duke Energy PowerPair battery rebates ($5,400 storage + $3,600 solar) and monthly Battery Control credits using the $6.50/kW formula times the 70.9% capability factor (subject to change).
Xcel Energy Colorado: Renewable Battery Connect (2026 Reopened VPP)
Model Xcel Energy Colorado Renewable Battery Connect after May 2026: $250/kW general (cap $5,000), $1,000/kW income-qualified and $500/kW DIC (each capped at 75% of equipment cost), plus $100/year for five years.