Eversource Energy (Massachusetts) Rate Selection Guide
Eversource is Massachusetts' largest electric utility, serving about 1.53 million electric and 280,000 gas customers across Eastern and Western Massachusetts. For C&I energy teams, Eversource offers modern programmatic data access through Green Button Connect My Data (OAuth 2.0 via UtilityAPI / Usage Link), Energy Profiler Online for interval data, and full supplier EDI. Massachusetts is a fully deregulated supply market, so customers buy generation from competitive suppliers or Basic Service while Eversource provides delivery.
Eversource Energy (Massachusetts) Rate Schedule Comparison
| Schedule | Type | Rate | Best For |
|---|---|---|---|
| G-1 | Small commercial | Customer charge + per-kWh delivery; Non-Demand and Demand options (structure) | Small commercial customers below ~10 kW demand |
| G-2 | Medium commercial (demand-metered) | ~$27.26/kW demand + ~$0.02335/kWh delivery (Greater Boston, eff. ~9/1/2025) | Medium commercial/industrial with steady demand |
| G-3 | Large C&I TOU | TOU peak/off-peak delivery + tiered customer charge ($27-$110+/mo) + per-kW demand | Large facilities >100 kW average demand |
| EGMA C&I Gas | Natural gas distribution | Seasonal volumetric distribution + Cost of Gas (structure) | Commercial/industrial natural gas users |
| Firm Transportation (T-class) | Gas transportation | Transportation distribution charge; customer-supplied commodity (structure) | Larger C&I gas users buying gas on the market |
Market Overview
Massachusetts is a fully deregulated retail energy market. Eversource is the regulated delivery utility and meter data provider; customers choose generation supply from competitive suppliers, municipal aggregations, or default Basic Service. Suppliers transact with Eversource via EDI.
Need to pull your actual usage data to compare rates? See the Eversource Energy (Massachusetts) Data Access Guide →
Community Choice Aggregation (CCA) Options
Many Massachusetts municipalities run Community Choice / municipal aggregation programs that procure default generation supply for residents and businesses while Eversource delivers.
Default generation supply provided by Eversource for customers who do not select a competitive supplier or municipal aggregation.
Current Rate Schedules
Eversource (NSTAR Electric / Western Massachusetts Electric) is the distribution utility for much of Massachusetts, regulated by the MA Department of Public Utilities (DPU). Massachusetts is fully restructured: Eversource provides delivery service while generation/supply comes from Basic Service (default), a competitive supplier, or a municipal aggregation. Commercial general-service rates (G-1/G-2/G-3) separate a fixed customer charge, volumetric delivery, and (for larger classes) a per-kW demand charge. Rates differ between the Greater Boston/Eastern MA and Western MA divisions.
Effective: September 1, 2025 · Full Tariff Book →
| Schedule | Type | Applicability | Structure | Rate |
|---|---|---|---|---|
| Rate G-1 - Small General Service | Commercial general service (small) | Small commercial/industrial customers, generally with demand below 10 kW. Offered with both a Non-Demand price option and a Demand price option. | Fixed monthly customer charge plus volumetric delivery ($/kWh); the Demand option adds a per-kW demand charge for customers with measurable demand. Supply via Basic Service, competitive supplier, or municipal aggregation. | Structure-based; customer charge + per-kWh delivery published in the EMA rate summary+ Demand option applies a per-kW charge; Non-Demand option is energy-only |
| Rate G-2 - Medium General Service | Commercial general service (medium, demand-metered) | Medium commercial/industrial customers; demand-metered general service at distribution (secondary) voltage. | Fixed customer charge plus a per-kW demand charge and a low volumetric delivery rate, reflecting cost recovery weighted toward demand. Supply separate (Basic Service / competitive / aggregation). | Delivery ~$0.02335/kWh (Greater Boston, eff. ~9/1/2025)+ ~$27.26/kW demand charge (Greater Boston, eff. ~9/1/2025) |
| Rate G-3 - Large General Service Time-of-Use | Commercial/Industrial TOU (large, demand-metered) | Large customers where service voltage is below 14,000 volts and monthly demand exceeds an average of 100 kW over 12 consecutive months. | Time-of-use rate with peak and off-peak periods, a tiered fixed customer charge by demand band, and per-kW demand charges. Largest C&I general-service class on the standard tariff. | Structure-based; TOU peak/off-peak delivery published in the EMA rate summary+ Tiered customer charge $27.00/mo (<=150 kW) to $110.00/mo (151-300 kW) and higher bands; per-kW demand charges apply |
| Greater Boston / Western MA division rates | Geographic rate divisions | All MA commercial customers; Eversource MA is split into Greater Boston/Eastern MA (former NSTAR) and Western MA (former WMECO) rate divisions with separately filed schedules. | Same G-1/G-2/G-3 class structure in each division, but customer charges, delivery rates, and demand charges differ by division and are filed separately with the DPU. | Division-specific; see the relevant EMA or WMA rate summary+ Division-specific per-kW demand charges |
| Commercial & Industrial Natural Gas (G-4x / G-5x classes) | Commercial/Industrial natural gas distribution | Eversource Gas of Massachusetts (EGMA) C&I customers, classed by annual and peak-period usage: G-41 (medium annual/high peak), G-42 (high annual/high peak), G-43 (extra-high annual/high peak), G-50 (low annual/low peak), G-51 (medium annual/low peak). | Seasonal (winter/summer) volumetric distribution charges plus a fixed customer charge and a Cost of Gas (commodity) component; firm transportation customers take parallel T-41 through T-53 transportation rates and procure their own gas supply. | Structure-based; seasonal distribution + Cost of Gas published in the EGMA gas tariff and Cost of Gas filings+ Not applicable (gas; usage- and peak-classed distribution charges) |
Rate Recommendations by Use Case
Competitive supply procurement
Shop competitive suppliers or municipal aggregation against Basic Service using interval load shapes.
Massachusetts supply is fully deregulated and Basic Service is volatile; interval data secures tighter supplier pricing.
- Provide 12+ months of interval data to suppliers
- Compare fixed vs. index products
Demand and ICAP management
Use Energy Profiler Online or Green Button interval data to shave demand peaks and reduce ISO-NE capacity tags.
Delivery demand charges and ISO-NE ICAP tags are major C&I costs that interval visibility directly addresses.
- Target the annual ISO-NE coincident peak
- Use the EPO annual plan for ongoing data
Software / app development
Integrate Eversource billing and 15-minute interval data via Green Button Connect on UtilityAPI Usage Link.
Usage Link (UtilityAPI) provides standardized OAuth 2.0 access with 15-minute interval data for AMI accounts.
- Register at usagelink.eversource.com
- Test with sandbox accounts before going Live
Building benchmarking & disclosure
Aggregate tenant usage for benchmarking and Massachusetts disclosure via the Energy Reporting & Disclosure Portal.
The disclosure portal plus tenant authorization gives owners building-level usage for benchmarking.
- Collect tenant authorization forms early
- Allow 2 business days for processing
Supplier / ESCO integration
Exchange enrollment, usage, billing, and payment data with Eversource via ANSI X12 4010 EDI.
Competitive suppliers must use EDI 814/867/810/820 to transact with Eversource as the delivery utility.
- Use VAN or SFTP connectivity
- Complete sandbox testing before go-live
Historical Rate Trends
Eversource MA distribution rates rose under the DPU 22-22 electric rate case and its PBR plan; supply (Basic Service) rates have been volatile, with sharp winter increases drawing DPU intervention, and EGMA gas rates rose materially in 2025.
December 2, 2022
DPU Docket 22-22 final order allowed NSTAR Electric (Eversource) a base distribution rate increase (~$37M first-year) and approved a Performance-Based Ratemaking plan with ~3.5% annual increases over the following years.
~+3.5%/yr (PBR plan)January 1, 2025
Winter Basic Service (supply) rates rose sharply for Eversource MA customers, prompting DPU action to block/defer part of the increase and spread costs to reduce winter bill impact.
Sharp winter supply increase (later moderated by DPU)November 1, 2025
Eversource Gas of Massachusetts (EGMA) implemented a gas rate increase for the 2025-2026 heating season; the DPU reduced Eversource's proposed home-heating gas rate increase from the ~25-30% originally sought.
Increase (DPU reduced from ~25-30% proposed)Overall trend: increasing
Next expected change: Annual PBR-driven delivery adjustments and semiannual Basic Service supply resets; further changes likely from the 2025 EGMA gas rate case and ongoing DPU reconciling-factor filings.
Cost Optimization Strategies
With demand charges dominating G-2/G-3 bills and supply unbundled, Eversource MA commercial customers save most through demand management, supply procurement, and rate-class fit.
Reduce and flatten peak demand (kW)
For: Rate G-2, Rate G-3
G-2 and G-3 carry large per-kW demand charges (G-2 ~$27/kW). Peak-shaving with batteries, staggering equipment startup, and limiting coincident demand directly cut the demand-charge portion of the bill.
Compare supply: Basic Service vs. competitive vs. aggregation
For: All commercial electric rate classes
Because supply is unbundled, customers can leave volatile Basic Service for a fixed-price competitive contract or a municipal aggregation, hedging against sharp winter supply spikes.
Use G-3 time-of-use periods
For: Rate G-3
G-3 has peak and off-peak pricing; shifting flexible load (charging, batch processing, pre-cooling) to off-peak hours lowers TOU energy costs.
Confirm correct rate class and demand option
For: Rate G-1, G-2, G-3
Small customers can compare the G-1 Non-Demand vs. Demand options, and growing customers should verify whether G-2 or G-3 (with its TOU structure) minimizes total cost given their load and demand profile.
Optimize gas class and consider transportation
For: EGMA commercial/industrial gas customers
EGMA C&I gas classes (G-41 through G-51) are assigned by annual and peak-period usage; larger users can evaluate firm transportation (T-class) to procure their own commodity and bypass the utility supply markup.
To implement these strategies, you need your 15-minute interval data. Learn how to download Eversource Energy (Massachusetts) interval data →
Deregulated Market Shopping
Massachusetts customers buy generation supply separately from Eversource delivery. C&I customers can choose a competitive supplier, join a municipal aggregation, or stay on Eversource Basic Service. The state Energy Switch MA portal lists licensed residential suppliers; C&I customers typically procure through brokers or direct supplier contracts.
How to Compare Eversource Energy (Massachusetts) Suppliers
- 01Compare your current Basic Service rate against competitive supplier offers
- 02For C&I, solicit fixed or index supply quotes from licensed suppliers or a broker
- 03Check whether your municipality offers a Community Choice aggregation default
- 04Provide 12+ months of interval data to suppliers for accurate pricing
- 05Confirm contract start aligns with your Eversource meter read cycle
Contract Terms for Eversource Energy (Massachusetts) Supply Agreements
- Competitive supply contracts have fixed terms (often 6-36 months) with early termination fees
- Municipal aggregation enrollment is automatic for residents with opt-out
- Basic Service supply rates reset twice yearly for C&I customers
- Watch for variable-rate and teaser-rate supplier offers
Common Pitfalls When Shopping Eversource Energy (Massachusetts) Rates
- Eversource still charges regulated delivery regardless of supplier
- Some competitive supplier rates can exceed Basic Service after teaser periods
- Confirm capacity (ICAP) and ancillary pass-through terms in C&I contracts
- Switching suppliers happens at the meter read date, not instantly
Frequently Asked Questions
How do C&I customers get 15-minute interval data from Eversource?▾
Smart meter and interval-meter customers can access 15-minute interval data through Green Button Connect (via UtilityAPI Usage Link, live since August 2025) or Energy Profiler Online. Green Button download provides 13 months of usage as ESPI XML. Smart meter rollout is ongoing, so availability varies by site.
Does Eversource Massachusetts support EDI?▾
Yes, for competitive suppliers. Eversource supports ANSI X12 Version 4010 EDI for electric (814 enrollments, 867 usage, 810 invoices, 820 payments, 824 advice) and EBT for gas. Suppliers sign a service agreement and complete testing before going live.
Who supplies my electricity if Eversource is the utility?▾
Massachusetts is deregulated, so Eversource delivers electricity and reads meters, but generation supply comes from a competitive supplier, a municipal aggregation, or Eversource Basic Service. Your bill separates delivery charges from supply charges.
How does a third party get authorized to access Eversource data?▾
Third parties use Green Button Connect (customer OAuth authorization via Usage Link / UtilityAPI), an Energy Disclosure authorization form emailed to EnergyDisclosure@eversource.com, or an Energy Profiler Online service agreement. Most authorizations process within a few business days.
What does Energy Profiler Online cost and provide?▾
Energy Profiler Online provides granular interval load shapes for interval-meter customers. It costs $50 for a one-time data pull (credentials expire after 30 days) or $300 per account per year for ongoing access with regular updates. Data is for analysis, not billing verification.
How far back does Eversource data go?▾
The online portal holds up to 36 months of bills and usage. Green Button download provides a rolling 13-month window. Energy Profiler Online can deliver all available historical interval data at the time of request.
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