NSTAR Gas Company (Eversource Energy) Data Access Guide
NSTAR Gas Company, operating under the Eversource Energy brand, distributes natural gas to roughly 239,000 customers across eastern Massachusetts. Delivery service is regulated by the Massachusetts DPU, while gas supply is open to competitive suppliers under the state's deregulated gas market.
How to Get Your NSTAR Gas Company (Eversource Energy) Data: All Access Methods
| Method | 1st Party | 3rd Party | Customer Types | Data Types | Latency | Format |
|---|---|---|---|---|---|---|
| Online Billing Portal | ✓ | — | Residential, Business | Billing, monthly usage | Monthly | |
| Energy Profiler Online | ✓ | ✓ | C&I with interval meters | Interval usage / load shape | Daily/15-min | Web, CSV (varies) |
| EDI X12 4010 | ✓ | ✓ | Suppliers / trading partners | Usage, billing | As requested | EDI |
| Data Aggregators | ✓ | ✓ | All | Billing, usage | Monthly | API/CSV |
| Green Button | — | — | None (gas) | N/A | N/A | N/A |
Billing Data Access
NSTAR Gas customers access billing data through the Eversource customer portal at eversource.com. Up to 36 months of billing history is available as PDF. There is no native CSV or XML export through the standard portal; structured data requires EDI, a data aggregator, or a Customer Information Release Form.
What Data Is on Your NSTAR Gas Company (Eversource Energy) Bill
- Billing period dates
- Meter reading information
- Gas (supply) charges
- Delivery charges
- Taxes and fees
- Total amount due
- Payment status
- Monthly usage in therms
How to Download NSTAR Gas Company (Eversource Energy) Bills (Business & Commercial)
- 01Sign in to the Eversource business portal at https://www.eversource.com/business
- 02Open Account & Billing and review itemized gas, delivery, tax and demand charges
- 03For structured exports, request data via EDI 867, a data aggregator, or a Customer Information Release Form
- 04Contact Business Customer Service at 1-800-334-5002 or SupplierServicesEMA@eversource.com for bulk/custom requests
How to Download NSTAR Gas Company (Eversource Energy) Bills (Residential)
- 01Navigate to https://www.eversource.com/security/account/login and sign in (or register at the residential account-billing page)
- 02Open the Account & Billing section and select Your Account
- 03Select Past Bills and Payments to view up to 36 months of bills
- 04Download or print each bill as a PDF
Third-Party Access to NSTAR Gas Company (Eversource Energy) Billing Data
Customer Information Release Form
- 01Provide the Eversource Customer Information Release Form to the customer
- 02Customer specifies authorized account numbers and data types and signs
- 03Submit signed form to Eversource with the specific data request
- 04Eversource validates the authorization (typically 3-5 business days)
- 05Receive billing data, usually as PDF via secure portal or email
Data Aggregator (Nectar / UtilityAPI)
- 01Customer authorizes the aggregator to access their Eversource account
- 02Aggregator connects to Eversource systems and pulls 12-24 months of history
- 03Aggregator standardizes billing and usage data into a common schema
- 04Third party accesses normalized data through the aggregator API or portal — for Nectar, see docs.nectarclimate.com
Want to understand the charges on your bill?
See the NSTAR Gas Company (Eversource Energy) Rate Schedules & Tariff Guide →Interval Data & Smart Meters
NSTAR Gas uses a mix of legacy and AMR-capable meters. Granular interval (15-minute) gas data is available only to customers on interval-capable meters (e.g., GV or LG rate classes) through Energy Profiler Online (EPO), a web service Eversource operates with Schneider Electric. EPO data is non-billing quality.
How to Download NSTAR Gas Company (Eversource Energy) Interval Data via Green Button
- 01Green Button is not available for NSTAR gas data
- 02For interval gas data, confirm meter eligibility with Eversource at 1-800-334-5002
- 03Enroll in Energy Profiler Online and sign the EPO Service Agreement
- 04Log in to the EPO portal to view and export usage (CSV availability varies)
Interval data is essential for rate comparison and TOU analysis.
See which NSTAR Gas Company (Eversource Energy) rate schedule is best for your usage pattern →Sources
Third-Party API Access
NSTAR Gas does not publish a native developer API for gas data. Programmatic access is achieved through data aggregators (Nectar, UtilityAPI) that interface with Eversource via EDI and portal automation, or directly through EDI for suppliers and trading partners. For Nectar's API, see docs.nectarclimate.com.
Available NSTAR Gas Company (Eversource Energy) API Endpoints
| Function | Endpoint | Method | Format |
|---|---|---|---|
| Retrieve bills | https://utilityapi.com/api/v2/bills | GET | JSON |
| List meters | https://utilityapi.com/api/v2/meters | GET | JSON |
How to Register as a NSTAR Gas Company (Eversource Energy) API Vendor
- 01Obtain customer authorization via Customer Information Release Form or aggregator consent flow
- 02Select an aggregator (Nectar, UtilityAPI) or establish EDI trading-partner status
- 03Pull standardized billing/usage data through the aggregator API or EDI 867
- 04Reconcile delivered data against customer bills
EDI (Electronic Data Interchange)
NSTAR Gas supports comprehensive EDI for gas suppliers, retailers and trading partners using the ANSI X12 Version 4010 standard. Legacy 3010 is no longer supported. EDI is exchanged over a VAN or point-to-point connection and is the primary automated channel for supplier enrollment, usage and billing transactions.
Supported NSTAR Gas Company (Eversource Energy) EDI Transaction Sets
| Code | Name | Purpose |
|---|---|---|
| 814 | Change / Account Maintenance | Enrollments, drops, reinstatements and account modifications |
| 867 | Historical & Monthly Usage | Customer usage history and monthly consumption for supplier billing |
| 820 | Payment / Remittance | Supplier invoice payments and remittances |
| 810 | Invoice | ESP and LDC invoicing |
| 824 | Application Advice | Acknowledgment of EDI transactions |
How to Enroll in NSTAR Gas Company (Eversource Energy) EDI
- 01Review the Gas EBT implementation guides (Appendices A-D) on the Eversource supplier site
- 02Sign the Gas Supplier Service Agreement to establish a trading-partner relationship
- 03Set up EDI infrastructure (VAN or point-to-point) with an X12 4010 translator
- 04Register EDI contact, DUNS and transaction types with Eversource
- 05Complete testing for 814, 867, 820 transactions, then go live
Rate Schedules & Tariff Analysis
For NSTAR Gas C&I customers, the bill splits into a regulated delivery component (customer charge + volumetric distribution, set by the DPU) and a supply component (competitive supplier price or default GAF). Because supply is deregulated, the largest lever for most C&I accounts is competitive supplier procurement; delivery rates are fixed by tariff and rose materially on November 1, 2025.
NSTAR Gas Company (Eversource Energy) Rate Schedule List
| Schedule | Applicability |
|---|---|
| G-40 / G-41 General Service | Small/medium commercial & industrial |
| G-50 / G-51 Large C&I | Large/high-load-factor commercial & industrial |
| Default Gas Supply (GAF) | C&I without a competitive supplier |
NSTAR Gas Company (Eversource Energy) Rate Features & TOU Details
- Delivery rates regulated by the Massachusetts DPU
- Supply portion open to competitive suppliers (deregulated)
- Default supply priced at the DPU-approved Gas Adjustment Factor
- Customer charge + volumetric distribution structure for C&I classes
- November 1, 2025 delivery rate increase of roughly 24-28%
For a deeper analysis including cost optimization strategies and historical rate trends:
Read the full NSTAR Gas Company (Eversource Energy) Rate Optimization Guide →Other Data Access Programs
E-Business Policy & Supplier eConnection
Eversource maintains an E-Business Policy for electronic exchange with suppliers and trading partners, including Supplier eConnection, an Ariba-based supplier registry, and point-to-point or VAN-based EDI. A Trading Partner Agreement is required.
- 01Review the Eversource E-Business Policy
- 02Execute a Trading Partner Agreement
- 03Choose VAN or point-to-point connectivity
- 04Register through Supplier eConnection / Ariba
Limitations & Considerations
- ⚠No Green Button support for gas data (electric only)
- ⚠No native gas developer API; programmatic access relies on EDI or aggregators
- ⚠Standard portal exports are PDF only — no native CSV/XML
- ⚠Interval gas data is non-billing quality and limited to interval-capable meters
- ⚠Third-party billing access requires a signed Customer Information Release Form
NSTAR Gas Company (Eversource Energy) Data Access FAQ
Can my business choose its own natural gas supplier from NSTAR Gas?▾
Yes. Massachusetts gas supply is deregulated, so C&I customers can buy the gas commodity from a licensed competitive supplier. NSTAR Gas still delivers the gas, reads the meter, and sends the bill — only the supply charge changes. Customers who do not choose a supplier receive default supply at the DPU-approved Gas Adjustment Factor.
How does a third party or consultant get my NSTAR Gas usage data?▾
Authorize them with the Eversource Customer Information Release Form, or use a data aggregator (Nectar, UtilityAPI) that connects to Eversource on your behalf — for Nectar, see docs.nectarclimate.com. Suppliers and trading partners can also exchange usage via EDI 867. Standard portal bills are PDF; structured exports come through these channels.
Does NSTAR Gas offer interval (15-minute) gas data or Green Button?▾
Green Button is not available for NSTAR gas data (it exists only for Eversource MA electric). Interval gas data is available only to customers with interval-capable meters (e.g., GV/LG classes) through Energy Profiler Online, and it is non-billing quality. Most C&I accounts have monthly therm data.
What changed with NSTAR Gas rates on November 1, 2025?▾
The Massachusetts DPU approved new delivery rates effective November 1, 2025, increasing delivery charges roughly 24-28% versus the prior period — about a 13% increase on the total bill for a typical customer. Specific per-therm C&I figures are in the currently effective tariff filed with the DPU.
What does EDI support look like for gas suppliers?▾
NSTAR Gas supports ANSI X12 Version 4010 EDI for suppliers and trading partners, covering 814 (enrollment/change), 867 (usage), 810 (invoice) and 820 (remittance). New suppliers must sign a Gas Supplier Service Agreement, set up VAN or point-to-point connectivity, and complete testing before going live.
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