Maryland · Retail Power Marketer
Interstate Gas Supply, Inc.
12.30¢ per kWh, energy only, EIA-861 2025. Average bill $127.38 at 1,035.7 kWh a month, across 280 customers on that row.
Maryland averaged 19.53¢/kWh and $184.42 a month. The United States averaged 17.23¢/kWh and $150.68. State and national figures come from EIA's Average Bill file.
Revenue divided by sales, EIA-861 Sales to Ultimate Customers, 2025, released October 7, 2026. Texas wires utilities come from the Delivery Companies file. The price and bill use energy only service. Customer count: 280, the largest residential count across service types.
Estimate a bill
The figure below is this utility's 2025 EIA residential average.
2025 EIA average
$123.00
12.30¢/kWh × 1,000 kWh. Energy only residential average, EIA-861 2025. The customer charge is already folded into this average, so it stands beside a tariff total rather than being added to it.
Annual history
| Year | ¢/kWh | Avg. bill | Avg. kWh | Customers |
|---|---|---|---|---|
| 2015 | — | — | — | — |
| 2016 | 9.82¢ | $78.24 | 796.9 | 3,335 |
| 2017 | 9.54¢ | $71.46 | 748.9 | 3,284 |
| 2018 | 10.07¢ | $80.40 | 798.3 | 2,610 |
| 2019 | 9.45¢ | $72.12 | 763.0 | 2,058 |
| 2020 | 8.89¢ | $67.52 | 759.3 | 1,781 |
| 2021 | 10.09¢ | $75.41 | 747.2 | 1,871 |
| 2022 | 13.19¢ | $95.47 | 723.6 | 1,696 |
| 2023 | 11.87¢ | $79.08 | 666.0 | 1,431 |
| 2024 | 12.25¢ | $86.19 | 703.6 | 1,312 |
| 2025 | 12.30¢ | $127.38 | 1,035.7 | 280 |
EIA-861, 2015–2025, using the same service type as the 2025 figure. A blank year means that service was not in the file.
Counties
EIA's 2025 service-territory file does not list counties for this utility.
EIA-861 Service Territory, 2025. A listed county is the county EIA recorded. It does not mean every address in the county is served. Open this utility in the bill calculator · Rate history tool