Connecticut Natural Gas Corporation Data Access Guide
Connecticut Natural Gas Corporation (CNG), an AVANGRID local distribution company, serves roughly 215,000 gas customers across Greater Hartford, New Britain, and Greenwich. CNG offers billing portal access, an Energy Analyzer tool with hourly consumption exports in CSV/XML, and ENERGY STAR Portfolio Manager integration, but does not yet support Green Button or a developer API.
How to Get Your Connecticut Natural Gas Corporation Data: All Access Methods
| Method | 1st Party | 3rd Party | Customer Types | Data Types | Latency | Format |
|---|---|---|---|---|---|---|
| Billing Portal (eBill) | ✓ | ✓ | Residential & C&I | Billing statements | Real-time online | |
| Energy Analyzer | ✓ | ✓ | Residential & C&I | Hourly/daily consumption | Daily | PDF, CSV, XML |
| ENERGY STAR Portfolio Manager | ✓ | ✓ | C&I / Municipal | Monthly consumption & cost | 7-10 business days | Automated web service |
| Green Button / Developer API | — | — | None | N/A | N/A | Not supported |
Billing Data Access
CNG provides billing data through the My Account online portal and mobile app. Customers can view and download up to 13 months of billing statements in PDF. Third-party access requires a signed Customer Information Disclosure Authorization under Connecticut's Gas Code of Conduct.
What Data Is on Your Connecticut Natural Gas Corporation Bill
- Current and historical bill statements (PDF)
- Payment status and payment history
- Scheduled payments and due dates
- Account balance
- Usage comparison tools
How to Download Connecticut Natural Gas Corporation Bills (Business & Commercial)
- 01Register the business account at portal.cngcorp.com using the account number from your bill
- 02Open the Billing section to view up to 13 months of statements
- 03For consultant or energy-manager access, request a Customer Information Disclosure Authorization form from Customer Care
- 04Specify the third party, data types, and time period; submit the signed form
- 05CNG verifies the authorization and releases data per the agreement
How to Download Connecticut Natural Gas Corporation Bills (Residential)
- 01Visit https://www.cngcorp.com/ and click 'Sign in / Register'
- 02Create an account using your service address and account number from your bill
- 03Verify identity via email or security questions
- 04Log in to portal.cngcorp.com and open the 'Billing' / 'My Bill' section
- 05Select a month from the bill history dropdown and click 'View Bill' to download the PDF
Third-Party Access to Connecticut Natural Gas Corporation Billing Data
Customer Information Disclosure Authorization (Gas Code of Conduct)
- 01Customer requests the disclosure authorization form from Customer.Care@cngcorp.com
- 02Customer identifies the third-party organization and the data elements to be shared
- 03Customer signs (written, electronic, or recorded verbal) and submits the form
- 04CNG verifies identity and activates third-party data sharing for the authorized scope
Want to understand the charges on your bill?
See the Connecticut Natural Gas Corporation Rate Schedules & Tariff Guide →Interval Data & Smart Meters
CNG's Energy Analyzer tool provides daily and hourly consumption visualization with export to PDF, CSV, and XML. Available to all customer classes after a 72-hour activation period. Daily-demand metering applies to Medium and Large General Service customers; detailed interval data is available on request.
How to Download Connecticut Natural Gas Corporation Interval Data via Green Button
- 01Green Button (DMD/CMD) is not supported by CNG
- 02Use Energy Analyzer export instead: log in to portal.cngcorp.com and open Energy Analyzer
- 03Select the meter, date range, and metrics
- 04Click Download/Export and choose PDF, CSV, or XML
Interval data is essential for rate comparison and TOU analysis.
See which Connecticut Natural Gas Corporation rate schedule is best for your usage pattern →Sources
Third-Party API Access
CNG does not operate a developer API or self-service third-party portal. Programmatic, recurring data transfer is available through ENERGY STAR Portfolio Manager integration for facility benchmarking, and the SmartBuildings CT program automates that transfer for eligible commercial and municipal customers.
How to Register as a Connecticut Natural Gas Corporation API Vendor
- 01Have the customer sign CNG's Customer Information Disclosure Authorization
- 02For ESPM: create a Portfolio Manager account and obtain Property and Meter IDs
- 03Request 'Energy Star Portfolio Manager data authorization' from CNG Customer Care
- 04Authorize recurring monthly data transfers to ESPM
EDI (Electronic Data Interchange)
CNG provides limited EDI/automated data exchange primarily to satisfy Connecticut benchmarking statutes (CGS 16-245ii and 16a-37t). It supports automated upload of billing and consumption data to the state's EnergyCAP system and to ENERGY STAR Portfolio Manager, but there is no published formal EDI trading-partner program.
Supported Connecticut Natural Gas Corporation EDI Transaction Sets
| Code | Name | Purpose |
|---|---|---|
| 867 | Consumption / Benchmarking Data | Monthly consumption transfer to ESPM and EnergyCAP for nonresidential benchmarking compliance (no formal NAESB EDI program published). |
How to Enroll in Connecticut Natural Gas Corporation EDI
- 01Contact CNG Customer Care to discuss data-exchange options
- 02For state agencies: enroll facilities in EnergyCAP via Connecticut DEEP
- 03For benchmarking: set up ENERGY STAR Portfolio Manager and request CNG data authorization
Rate Schedules & Tariff Analysis
CNG firm general-service rates follow a fixed customer charge plus per-CCF distribution charge that declines as the class grows (SGS to MGS to LGS). The commodity cost is passed through via the Purchased Gas Adjustment, and large customers can reduce or shed the CNG commodity through Transportation or Interruptible service. Exact per-CCF distribution charges are in the PURA-approved tariff sheets; CNG does not publish per-CCF tables on its general pricing page.
Connecticut Natural Gas Corporation Rate Schedule List
| Schedule | Applicability |
|---|---|
| Small General Service (SGS) | Small commercial accounts. |
| Medium General Service (MGS) | ~5,000-30,000 CCF/yr; daily-demand metering available. |
| Large General Service (LGS) | 30,000+ CCF/yr; daily-demand metering. |
| Transportation Service (TS) | Delivery-only for customers buying gas from a marketer. |
| Interruptible Service | Curtailable load with monthly PURA-published rates. |
Connecticut Natural Gas Corporation Rate Features & TOU Details
- Declining-block distribution charges across SGS/MGS/LGS
- Purchased Gas Adjustment passes commodity cost through monthly
- Daily-demand metering and charge for MGS/LGS
- Transportation Service decouples CNG delivery from competitive commodity
- Interruptible option for dual-fuel customers
For a deeper analysis including cost optimization strategies and historical rate trends:
Read the full Connecticut Natural Gas Corporation Rate Optimization Guide →Other Data Access Programs
SmartBuildings CT
No-cost energy management program administered by CCAT that automates CNG data transfer to ENERGY STAR Portfolio Manager and provides benchmarking and energy consulting for commercial, municipal, non-profit, multifamily, and industrial facilities.
- 01Contact SmartBuildings CT and submit facility information
- 02Authorize CNG data sharing
- 03Program staff sets up ESPM
- 04Automated CNG data transfers are enabled
EnergyCAP (State Agencies & Municipalities)
Connecticut DEEP's Lead By Example program uses EnergyCAP to automatically receive CNG billing and consumption data for state and municipal building benchmarking.
- 01Enroll agency facilities in EnergyCAP via CT DEEP
- 02CNG uploads invoices and consumption automatically
- 03Data appears within 10-15 business days of billing
Limitations & Considerations
- ⚠No Green Button Download My Data or Connect My Data (ESPI) support.
- ⚠No public developer API or self-service third-party data portal.
- ⚠Billing records are PDF-only; no CSV/XML export for billing data (consumption export is available via Energy Analyzer).
- ⚠Third-party access requires a signed Customer Information Disclosure Authorization for each customer.
- ⚠No system-wide AMI; sub-hourly interval data limited to MGS/LGS daily-demand meters.
Connecticut Natural Gas Corporation Data Access FAQ
Can a consultant pull our facility's gas consumption data programmatically?▾
Not via a developer API. The practical path is ENERGY STAR Portfolio Manager integration (often set up for free through SmartBuildings CT), which delivers automated monthly billing and consumption data. For ad hoc interval data, the customer can export hourly usage from Energy Analyzer in CSV/XML, or sign a Customer Information Disclosure Authorization letting CNG release data to the consultant.
What rate schedule applies to a large commercial or industrial gas account?▾
Medium General Service (MGS) covers roughly 5,000-30,000 CCF annually and Large General Service (LGS) covers 30,000+ CCF annually. Both can carry daily-demand metering and a Daily Demand Metering Charge. Seasonal (SE) variants and interruptible/transportation options exist for larger or flexible loads.
How far back does CNG data go for C&I accounts?▾
The online portal holds 13 months of billing statements, and Energy Analyzer holds 24+ months of consumption data. Older records can be requested from Customer Care (5-10 business days, possible fee).
Is the gas supply portion of our bill open to competitive shopping?▾
Yes. Connecticut allows commercial and industrial customers to buy the gas commodity from a licensed third-party supplier while CNG continues to deliver it. CNG's distribution (delivery) charges and the Purchased Gas Adjustment still apply regardless of supplier.
Does CNG support EDI for ESCOs or aggregators?▾
Only in a limited form tied to benchmarking compliance (EnergyCAP, ESPM). CNG has no published formal NAESB EDI trading-partner program; ESCOs and aggregators should contact Customer Care to arrange data sharing under the Gas Code of Conduct.
The Best Way to Access Data from Connecticut Natural Gas Corporation
Nectar connects to Connecticut Natural Gas Corporation and 7,000+ utility providers — billing, interval, and rate data delivered automatically. No portals, no forms, no manual downloads.
Nectar for Energy & Sustainability Teams
Managing utility data for commercial or industrial buildings? Nectar offers a free energy data audit — we'll review your current setup and show you where automation can save your team hours every month.
Get a Free AuditNectar for Developers & Consultants
Building energy tools or advising clients on utility data? Nectar works with technology partners and consultants who need reliable data infrastructure.
Partner with Us