The United Illuminating Company Data Access Guide
The United Illuminating Company (UI), an Avangrid utility, provides electric distribution service to about 346,000 customers in southern Connecticut under the state's deregulated retail-choice market, regulated by PURA. UI offers a customer portal, Energy Analyzer with CSV/XML export, manual interval-data requests, and full supplier EDI (810/814/867), but has not implemented Green Button.
How to Get Your The United Illuminating Company Data: All Access Methods
| Method | 1st Party | 3rd Party | Customer Types | Data Types | Latency | Format |
|---|---|---|---|---|---|---|
| Online Portal / Energy Analyzer | ✓ | — | Residential, C&I | Bills, daily/monthly usage | Daily (72hr initial setup) | PDF / CSV / XML |
| Interval Data Request | ✓ | ✓ | C&I, suppliers | 15-min interval kWh | 7-10 business days | CSV / Excel |
| Customer Data / Historical Usage Request | ✓ | ✓ | C&I, consultants, aggregators | Monthly usage, demand, load profile | 5-10 business days | CSV / Excel / PDF |
| EDI (810/814/867) | — | ✓ | Suppliers, aggregators | Enrollment, invoice, usage | Batch / automated | EDI X12 |
| Green Button / Share My Data | — | — | None | Not implemented | N/A | N/A |
Billing Data Access
UI provides billing data through the portal.uinet.com customer portal and the Energy Analyzer tool. Customers can view up to 24 months of bills and download consumption data in PDF, CSV, and XML. Third-party access to billing data runs through formal Customer Data Request and Historical Usage Request processes with customer authorization.
What Data Is on Your The United Illuminating Company Bill
- Current and historical bills (PDF)
- Daily and monthly consumption (kWh)
- Demand readings (kW) for larger customers
- Account balance and payment due dates
- Rate schedule and load profile information
How to Download The United Illuminating Company Bills (Business & Commercial)
- 01Log in to portal.uinet.com and open Energy Analyzer
- 02Use facility comparison for multi-location accounts
- 03Export consumption in CSV or XML for analysis software
- 04For extended history or formal exports, email supplier.relations@uinet.com (5-10 business day turnaround)
How to Download The United Illuminating Company Bills (Residential)
- 01Register at portal.uinet.com using your account number and name key
- 02Wait up to 72 hours after account creation for Energy Analyzer data
- 03Open Energy Analyzer and select a date range
- 04Download consumption data as PDF, CSV, or XML
- 05View up to 24 months of bills under Billing > View Bill History
Third-Party Access to The United Illuminating Company Billing Data
Customer Data Request
- 01Obtain written customer authorization (LOA) specifying account, scope, and date range
- 02Complete UI's Customer Data Request form (from supplier.relations@uinet.com)
- 03Email form plus authorization to supplier.relations@uinet.com
- 04Receive CSV/Excel/PDF data within 5-10 business days
Historical Usage Request (Suppliers/Aggregators)
- 01Be a licensed supplier or registered aggregator (or authorized consultant)
- 02Submit a Historical Usage Request with customer authorization
- 03Specify customers, date ranges, and data types
- 04Receive monthly usage/demand exports (typically 5-10 business days; batches 7-15 days)
Want to understand the charges on your bill?
See the The United Illuminating Company Rate Schedules & Tariff Guide →Interval Data & Smart Meters
UI has deployed AMI smart meters capable of 15-minute interval reads. Interval data is not self-service; it is obtained through a signed Interval Data Request Service Agreement, processed within about 7 business days and delivered electronically. Energy Analyzer also provides granular daily consumption.
How to Download The United Illuminating Company Interval Data via Green Button
- 01Green Button is not implemented at UI
- 02Confirm AMI/interval availability with customer service (800-722-5584)
- 03Submit an Interval Data Request Service Agreement to supplier.relations@uinet.com
- 04Receive CSV/Excel interval data (timestamp + kWh) within ~7-10 business days
Interval data is essential for rate comparison and TOU analysis.
See which The United Illuminating Company rate schedule is best for your usage pattern →Third-Party API Access
UI does not offer a public REST/GraphQL developer API. Programmatic third-party access is via EDI for suppliers/aggregators and the Supplier Management System (SMS) self-service portal, plus manual Customer Data and Historical Usage Requests. Nectar provides API access to UI billing and interval data with customer authorization — see docs.nectarclimate.com.
How to Register as a The United Illuminating Company API Vendor
- 01For automated access, establish supplier/aggregator status and EDI with UI
- 02Use the Supplier Management System for lists, load profiles, and settlement
- 03For one-off customer data, submit Customer Data / Historical Usage Requests
- 04Consider Nectar for API-based multi-utility bill data (docs.nectarclimate.com)
EDI (Electronic Data Interchange)
Supported The United Illuminating Company EDI Transaction Sets
| Code | Name | Purpose |
|---|---|---|
| 814 | Enrollment / Change / Drop / Move | Customer enrollment, changes, drops, and moves in the deregulated market. |
| 810 | Invoice | Billing and invoice reconciliation between UI and suppliers. |
| 867 | Historical Usage / Interval Data | Submission of historical and interval usage data. |
| 997 | Functional Acknowledgment | Acknowledges receipt and syntax of EDI transactions. |
How to Enroll in The United Illuminating Company EDI
- 01Email supplier.relations@uinet.com requesting EDI setup and the CT EBT guides (814, 810, 867)
- 02Review transaction guides and configure your EDI system (VAN, SFTP, or web portal)
- 03Complete the Electric Supplier (or Aggregator) Service Agreement with required documents
- 04Complete EDI testing of enrollment, invoice, and usage transactions (4-6 weeks typical)
- 05Receive production credentials and go live
Rate Schedules & Tariff Analysis
UI bills separate delivery (distribution) from supply (generation). Delivery rates are set by PURA in base rate cases (most recently Docket 24-10-04, effective Nov 1, 2025), while generation is either a competitive supplier rate or UI Standard Service, reset every six months as a no-markup pass-through. For C&I customers, time-of-use schedules (GST, LPT) reward shifting load off the noon-8pm weekday peak, and transmission-voltage service (GST-TRA, LPT-TRA) lowers delivery charges for the largest loads. Verified generation figures are published; specific delivery cents/kWh and demand charges are in the PURA tariff sheets.
The United Illuminating Company Rate Schedule List
| Schedule | Applicability |
|---|---|
| Rate GS / GST | Commercial standard and time-of-use service |
| Rate GST-TRA | Commercial TOU at transmission voltage |
| Rate LPT / LPT-TRA | Large power TOU, distribution and transmission voltage |
| Rate GS-EVSE / GST-EVSE | Commercial EV charging stations |
The United Illuminating Company Rate Features & TOU Details
- Split delivery vs supply billing
- Standard Service generation reset every Jan 1 and Jul 1
- Time-of-use peak window: weekdays noon-8pm
- Transmission-voltage schedules (GST-TRA, LPT-TRA) for the largest loads
- Competitive supplier shopping available via EnergizeCT
- Last Resort Service for LPT/GST customers over 500 kW
For a deeper analysis including cost optimization strategies and historical rate trends:
Read the full The United Illuminating Company Rate Optimization Guide →Other Data Access Programs
Historical Usage Request Service
Structured process letting suppliers, aggregators, and authorized consultants request historical monthly billing and usage (kWh, kW, load profile) for customers with authorization.
- 01Establish supplier/aggregator status or obtain customer LOA
- 02Submit a Historical Usage Request to supplier.relations@uinet.com
- 03Specify customers, date ranges, and data types
- 04Receive CSV/Excel exports (5-10 business days, batches 7-15)
Supplier Management System (SMS)
Secure self-service portal for suppliers/aggregators offering customer non-confidential lists, load profiles, meter schedules, capacity, and settlement reports.
- 01Request SMS credentials from supplier.relations@uinet.com
- 02Log in to the SMS portal
- 03Download lists, load profiles, and settlement data
- 04Generate reports on the customer base
EV Managed Charging (Bidgely partnership)
Connecticut EV Managed Charging Program where enrolled customers share hourly consumption data with Bidgely for optimized charging.
- 01Enroll in the Connecticut EV charging program
- 02Consent to share hourly usage data with Bidgely
- 03Receive charging optimization recommendations
Limitations & Considerations
- ⚠No Green Button Download or Connect My Data (peer Eversource has it)
- ⚠No OAuth-based Share My Data third-party portal
- ⚠No public developer API (REST/GraphQL)
- ⚠Interval data requires a signed manual request, not self-service
- ⚠EPA Portfolio Manager auto-upload not integrated
- ⚠Most third-party access requires 5-10 business day manual turnarounds
The United Illuminating Company Data Access FAQ
How does a C&I customer get 15-minute interval data from UI?▾
UI has AMI meters capable of 15-minute reads, but interval data is not self-service. Submit a signed Interval Data Request Service Agreement to supplier.relations@uinet.com specifying account, meter, date range, and format. Data is delivered as CSV/Excel in roughly 7-10 business days, provided 'as is' and not guaranteed to match billing reads.
Does UI support EDI for suppliers and aggregators?▾
Yes. UI fully supports ANSI X12 / NAESB Connecticut EBT transactions including 814 (enrollment/change/drop/move), 810 (invoice), 867 (historical/interval usage), and 997 (acknowledgment). Setup runs through supplier.relations@uinet.com with a service agreement and testing phase (typically 4-6 weeks), via VAN, SFTP, or web portal.
Does UI offer Green Button or a public API?▾
No. UI has not implemented Green Button Download or Connect My Data, and offers no public REST/GraphQL API. Programmatic access is through EDI and the Supplier Management System for suppliers/aggregators, plus manual Customer Data and Historical Usage Requests. Nectar can also provide customer-authorized API access to UI data — see docs.nectarclimate.com.
Can a C&I customer shop for a competitive electricity supplier?▾
Yes. Connecticut is deregulated, so UI customers can buy generation from a licensed competitive supplier or take UI Standard Service (a no-markup pass-through reset every January 1 and July 1). UI always provides delivery. Compare supplier offers at EnergizeCT (Connecticut's official rate board).
Which rate schedules apply to commercial and industrial customers?▾
Commercial/industrial delivery service is billed under PURA-approved schedules effective November 1, 2025: Rate GS (General Service), Rate GST (General Service Time-of-Use), GST-TRA (transmission voltage), Rate LPT (Large Power Time-of-Use), LPT-TRA (transmission voltage), plus EV charging rates GS-EVSE and GST-EVSE. Standard Service generation rates are set separately every six months.
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