Washington Gas Light Company Data Access Guide
Washington Gas Light Company (a WGL Holdings subsidiary) is an investor-owned natural gas distribution utility serving roughly 1.3 million customers across Washington, D.C., Maryland, and Virginia. Customers access billing data through the My Washington Gas portal; interval data is not directly available, but aggregated whole-building consumption is offered via the Energy Benchmarking program (ENERGY STAR Portfolio Manager). Washington Gas operates Customer Choice gas-supply programs with EDI-based supplier transactions and is regulated by the DC PSC, Maryland PSC, and Virginia SCC.
How to Get Your Washington Gas Light Company Data: All Access Methods
| Method | 1st Party | 3rd Party | Customer Types | Data Types | Latency | Format |
|---|---|---|---|---|---|---|
| My Washington Gas portal | ✓ | — | Residential, Commercial | Billing, monthly usage | Real-time / monthly | PDF, portal display |
| Energy Benchmarking (Portfolio Manager) | ✓ | ✓ | Building owners (5+ meters) | Aggregated monthly consumption | Synced every 45 days | Portfolio Manager API / spreadsheet |
| Account Inquiry Portal | ✓ | ✓ | Business / authorized reps | Limited account/billing info | On-demand | Portal display |
| EDI (Customer Choice suppliers) | — | ✓ | Licensed gas suppliers | Enrollment, usage, charges | Real-time | ANSI X12 / XML |
Billing Data Access
Washington Gas provides billing data through the modernized My Washington Gas portal and mobile app, with up to 12 months of bill history viewable and printable. There is no native CSV/XML bulk export; bills download as PDF. A legacy Account Inquiry Portal supports limited authorized third-party access.
What Data Is on Your Washington Gas Light Company Bill
- Current and historical bills (12 months)
- Billing and payment history
- Account balance
- Month-to-month usage comparisons (therms)
- Estimated meter reading date
How to Download Washington Gas Light Company Bills (Business & Commercial)
- 01Register a business/multi-account login at the My Washington Gas or eService portal (https://myportal.washingtongas.com/)
- 02Review billing and payment history and account balance across locations
- 03Print bills as PDF for record-keeping (no native CSV export)
- 04For buildings with 5+ meters, use the Energy Benchmarking program for aggregated consumption data
How to Download Washington Gas Light Company Bills (Residential)
- 01Register at https://my.washingtongas.com/portal/ using account number, phone, and email
- 02Log in and open Billing & Payment / View My Bills
- 03View and print bills from the current and prior 12 months as PDF
- 04Enroll in eBill for monthly email notifications when the bill is ready
Third-Party Access to Washington Gas Light Company Billing Data
Account Inquiry Portal (authorized third party)
- 01Customer authorizes the third party (company name, contact, authorization period) with Washington Gas
- 02Third party registers at https://accountinquiry.washgas.com/Pages/Login.aspx
- 03Access limited account status, billing, and payment information for authorized accounts
Formal data request
- 01Obtain written customer consent specifying data scope and time period
- 02Submit a formal data request to Washington Gas referencing the authorization
- 03Receive billing/consumption data via secure email, SFTP, or portal
Want to understand the charges on your bill?
See the Washington Gas Light Company Rate Schedules & Tariff Guide →Interval Data & Smart Meters
Washington Gas has deployed AMI in parts of its territory, but interval (15/30-minute or hourly) gas consumption data is NOT directly available to individual customers. The portal shows monthly consumption (therms) only. Aggregated monthly whole-building data is available through the Energy Benchmarking program for buildings with 5+ meters.
How to Download Washington Gas Light Company Interval Data via Green Button
- 01Washington Gas does not offer Green Button Download My Data or Connect My Data.
- 02For whole-building benchmarking, use the Energy Benchmarking portal which syncs aggregated monthly data to ENERGY STAR Portfolio Manager
- 03Register at https://www.washingtongas.com/services/business-owners/energy-benchmarking and connect Portfolio Manager
- 04Contact aggregateddata@washgas.com for third-party benchmarking access
Interval data is essential for rate comparison and TOU analysis.
See which Washington Gas Light Company rate schedule is best for your usage pattern →Third-Party API Access
Washington Gas does not offer a public developer REST API. The only utility-native programmatic data feed is the Energy Benchmarking integration with EPA ENERGY STAR Portfolio Manager web services, limited to aggregated monthly whole-building consumption for buildings with 5+ meters. Nectar provides API access to Washington Gas billing data with customer authorization — see docs.nectarclimate.com.
How to Register as a Washington Gas Light Company API Vendor
- 01Obtain building-owner authorization and the list of gas meters (5+ required)
- 02Email aggregateddata@washgas.com with authorization and meter list
- 03Set up / link an ENERGY STAR Portfolio Manager account
- 04Receive automated aggregated monthly data feeds via Portfolio Manager
EDI (Electronic Data Interchange)
Supported Washington Gas Light Company EDI Transaction Sets
| Code | Name | Purpose |
|---|---|---|
| 814 | Enrollment / Account Changes | Customer enrollment, drops, changes, and terminations between Washington Gas and licensed gas suppliers (Customer Choice). |
| 867 | Usage / Consumption | Transmits metered usage and consumption data to suppliers for billing and load forecasting. |
| 810 | Invoice / Charges | Billing and charges data exchanged under delivery-service supplier agreements. |
How to Enroll in Washington Gas Light Company EDI
- 01Obtain a Natural Gas Supplier license in the applicable jurisdiction (DCPSC, MD PSC, or VA SCC)
- 02Execute the Gas Supplier Application Agreement with Washington Gas Regulatory Affairs (6801 Industrial Road, Springfield, VA 22151)
- 03Review the Required Operating Procedures and agree to a VAN or direct EDI connection
- 04Complete EDI testing/certification, then begin production transactions
Rate Schedules & Tariff Analysis
A Washington Gas C&I bill separates regulated delivery (distribution) charges from the gas-supply commodity charge. Delivery charges - a monthly customer charge plus a per-therm distribution charge and riders - are set by the DC PSC, MD PSC, and VA SCC and are rising in 2026 (about 13% for DC distribution effective January 1, 2026; a proposed ~20% commercial increase in Maryland effective July 2026, pending). The commodity portion is either Washington Gas's pass-through cost of gas or a competitive supplier's price under Customer Choice. Interruptible service (No. 4) trades curtailability for lower delivery rates.
Washington Gas Light Company Rate Schedule List
| Schedule | Applicability |
|---|---|
| Firm Commercial & Industrial Delivery Service (No. 2A) | C&I firm gas delivery (DC, MD) |
| Group Metered Apartment Delivery Service (No. 3 / 3A) | Master-metered multifamily |
| Interruptible Delivery Service (No. 4) | Curtailable industrial load |
| Gas Supplier Delivery Service (No. 5 / No. 8) | Customer Choice delivery |
Washington Gas Light Company Rate Features & TOU Details
- Bill separates regulated delivery charges from gas-supply commodity charges
- Per-therm delivery charges and a fixed monthly customer charge by schedule
- Customer Choice lets C&I customers competitively procure the gas commodity
- Interruptible Rate Schedule No. 4 offers lower delivery rates for curtailable load
- Weather-normalization / revenue-normalization riders apply in some jurisdictions
For a deeper analysis including cost optimization strategies and historical rate trends:
Read the full Washington Gas Light Company Rate Optimization Guide →Other Data Access Programs
Energy Benchmarking Program
Provides aggregated, whole-building monthly gas consumption for multi-tenant buildings (5+ meters) to support DC, MD, and VA benchmarking ordinances, synced to EPA ENERGY STAR Portfolio Manager.
- 01Compile the list of all gas meters serving the building (5+ required)
- 02Register at the Energy Benchmarking portal and submit the meter list
- 03Link an ENERGY STAR Portfolio Manager account and authorize the data sync
- 04Access 24-35 months of aggregated monthly consumption; updates at least every 45 days
Customer Choice (Gas Supplier) Program
Allows residential and commercial customers to choose a licensed natural gas supplier while Washington Gas provides delivery service. Suppliers exchange enrollment, usage, and billing data via EDI.
- 01Compare licensed suppliers for DC, MD, or VA
- 02Select a supplier and authorize enrollment (one-bill or two-bill option)
- 03Washington Gas continues delivery service and bills delivery charges
MEDSIS Secure Portal (DC)
SharePoint-based secure portal (DC PSC Order No. 20286) for sharing system data with MEDSIS clean-energy project developers under NDA.
- 01Identify a qualifying MEDSIS project in DC
- 02Execute an NDA and complete security vetting
- 03Request portal access and download system/capacity data for project planning
Limitations & Considerations
- ⚠No interval/smart-meter gas data for individual customers - monthly therms only.
- ⚠No Green Button Download My Data or Connect My Data.
- ⚠No public developer REST API; Nectar provides API access to this utility's billing data — see docs.nectarclimate.com.
- ⚠No native CSV/Excel bulk export from the portal; bills download as PDF.
- ⚠Whole-building aggregated data requires 5+ meters (Energy Benchmarking).
- ⚠Supplier EDI specifications are not publicly published; contact Regulatory Affairs.
Washington Gas Light Company Data Access FAQ
Can a commercial customer get interval gas data from Washington Gas?▾
No. Washington Gas provides monthly consumption (therms) only; true interval (15/30-minute or hourly) gas data is not accessible to individual customers. For multi-tenant buildings with 5+ meters, the Energy Benchmarking program provides aggregated monthly whole-building consumption via ENERGY STAR Portfolio Manager.
How does a building owner get whole-building data for benchmarking compliance?▾
Enroll in the Energy Benchmarking program (https://www.washingtongas.com/services/business-owners/energy-benchmarking), submit your gas meter list (5+ meters required), and link an ENERGY STAR Portfolio Manager account. Aggregated monthly data (24-35 months) syncs at least every 45 days. Contact aggregateddata@washgas.com for setup or third-party access.
Does Washington Gas have a public API or Green Button?▾
No. Washington Gas does not offer a public REST API, Green Button Download My Data, or Connect My Data. The only utility-native programmatic feed is the Energy Benchmarking integration with EPA ENERGY STAR Portfolio Manager web services. Nectar provides API access to Washington Gas billing data with customer authorization — see docs.nectarclimate.com.
How does a third-party consultant access an individual customer's account data?▾
Use the Account Inquiry Portal (https://accountinquiry.washgas.com) after the customer authorizes your company with Washington Gas, or submit a formal data request with written customer consent. Access is limited to basic account, billing, and payment information - no detailed consumption or interval data.
What gas-supply choice does a C&I customer have, and how is data exchanged?▾
Through the Customer Choice program, C&I customers can buy gas from a licensed supplier while Washington Gas provides delivery service (DC Rate Schedule No. 5, MD No. 8, and Virginia equivalents). Licensed suppliers exchange enrollment (814), usage (867), and billing (810) data with Washington Gas over EDI.
Where can a C&I customer find the applicable tariff and current rates?▾
Tariffs are posted by jurisdiction at https://www.washingtongas.com/billing-and-payment/billing-tariff-rates-schedules (DC, Maryland, Virginia). Commercial delivery service is governed by Firm Commercial & Industrial Delivery Service Rate Schedule No. 2A, with group-metered apartment (No. 3/3A) and interruptible (No. 4) schedules also available.
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