United Illuminating Co
180 Marsh Hill RD Orange, CT 6477Company Summary Information
United Illuminating Co is ranked #2,020 out of 5,093 utilities nationwide in terms of total annual net electricity generation, and they are ranked #677 out of 1,279 utilities in terms of total annual net electricity generation from natural gas.
United Illuminating Co generated 17.2 GWh during the 3-month period between September 2024 to December 2024.
According to FERC EQR data, United Illuminating Co had a total of $20.2M in seller transasctions and $64.9M in buyer transasctions in 2025 Q2.
| Company Name | United Illuminating Co |
|---|---|
| Location | 180 Marsh Hill RD Orange, CT 6477 |
| EIA Utility Type | Investor-Owned Utility |
| EIA Utility Dates | Aug 2015 to Sep 2025 |
| EIA Annual Generation | 59.4 GWh |
| EIA Power Plants | 3 |
| Fuel Types | Natural Gas Solar |
| Ranked #2,020 out of 5,093 Utilities Nationwide by Annual Generation | |
| Ranked #677 out of 1,279 Utilities Nationwide in terms of Natural Gas Generation | |
FERC Seller Summary
| Seller Dates Available | Jul 2013 to Sep 2025 |
|---|---|
| Seller Total Transaction Charges | $643.79M |
| Seller Total Transactions | 8,796,740 |
| Seller 2025 Q2 Transaction Charges | $20.21M |
| Seller 2025 Q2 Transactions | 472,489 |
FERC Buyer Summary
| Buyer Dates Available | Jul 2013 to Sep 2025 |
|---|---|
| Buyer Total Transaction Charges | $3.12B |
| Buyer Total Transactions | 73,271 |
| Buyer 2025 Q2 Transaction Charges | $64.93M |
| Buyer 2025 Q2 Transactions | 136 |
Map of United Illuminating Co Locations
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Monthly Electricity Generation by Type
Monthly electricity generation by source as reported by the EIA
Monthly FERC Transaction Charges by Type
Monthly aggregates and sums are derived from FERC Electronic Quarterly Reports (EQR)
Power Plants Operated by United Illuminating Co
| Plant | Location | Annual Generation | Initial Operation Date | Last Update | Fuel Types |
|---|---|---|---|---|---|
| UI RCP Bridgeport Seaside | Bridgeport, Connecticut | 21 GWh | Oct 2015 | Sep 2025 | Natural Gas : 84.6% Solar : 15.4% |
| UI RCP New Haven Fuel Cell | New Haven, Connecticut | 13 GWh | Jul 2015 | Sep 2025 | Natural Gas |
| UI RCP Woodbridge FC | Woodbridge, Connecticut | 18 GWh | Nov 2016 | Dec 2024 | Natural Gas |
Other Companies Listed Alphabetically
A list of companies close to United Illuminating Co when arranged alphabetically. They do not neccessarily have any association with United Illuminating Co.
| Company Name | Company Location | EIA Annual Generation | FERC 2025 Q2 Transactions |
|---|---|---|---|
| Umass Boston | Dorchester, MA | 714.6 MWh | - |
| Umbriel Solar, LLC | Boston, MA | 352.1 GWh | $3.71M |
| Unalakleet Valley ELEC Coop | Unalakleet, AK | 4.0 GWh | - |
| Unbridled Solar, LLC | Bloomington, MN | - | $3.80M |
| Underhill Solar LLC | San Francisco, CA | 3.8 GWh | - |
| Union Carbide Corp-Seadrift | Midland, MI | 770.9 GWh | $3.22M |
| Union Electric Co - (Mo) | St Louis, MO | 34.7 TWh | $687.60M |
| Union Falls Hydro Power LP | Montreal, QB | 13.0 GWh | - |
| Unisea Inc | Dutch Harbor, AK | 35.0 GWh | - |
| Unison Energy LLC | Greenwich, CT | 23.6 GWh | - |
| United States Solar Corporation | Fairfield, CT | 115.0 GWh | - |
| United States Sugar Corp | Clewiston, FL | 272.8 GWh | - |
| United Technologies | East Hartford, CT | 94.9 GWh | - |
| United Therapeutics Corporation | Silver Spring, MD | 4.4 GWh | - |
| Unitil Energy Systems, Inc. | Hampton, NH | - | $4.65M |
| University Of Alaska | Fairbanks, AK | 70.0 GWh | - |
| University Of Arizona | Tucson, AZ | 96.7 GWh | - |
| University Of Arkansas | Fayetteville, AR | 36.6 GWh | - |
| University Of California Irvine | Irvine, CA | 122.0 GWh | - |
| University Of California San Diego | La Jolla, CA | 244.1 GWh | - |
Top 20 Companies Associated with United Illuminating Co
A list of the top 20 companies associated with United Illuminating Co in terms of total FERC EQR transactions charges. Total Transaction Charges are based on FERC EQR data obtained since Q3 2013.
| Company Name | 2025 Q2 Transactions w/ United Illuminating Co |
|---|---|
| Nextera Energy Marketing, LLC | $28.28M |
| Isone | $20.21M |
| Dominion Energy Nuclear Connecticut, Inc. | $17.33M |
| Constellation Energy Generation, LLC | $9.40M |
| Macquarie Energy Trading LLC | $3.98M |
| Nextera Energy Seabrook, LLC | $3.78M |
| Scef1 Fuel Cell, LLC | $575.13k |
| Derby Fuel Cell, LLC | $457.58k |
| Quinebaug Solar, LLC | $212.02k |
| Farmington Solar, LLC | $204.45k |
| Sanford Airport Solar, LLC | $195.68k |
| Nutmeg Solar, LLC | $187.39k |
| Coolidge Solar I, LLC | $168.54k |
| Hecate Energy Albany 2 LLC | $95.31k |
| Wallingford Renewable Energy LLC | $65.70k |
| HESS Corporation | - |
| Exelon Generation Company, LLC | - |
| Nextera Energy Power Marketing, LLC | - |
| DTE Energy Trading, Inc. | - |
| Citigroup Energy Inc. | - |
The 20 Most Recent FERC EQR Transactions
Displaying Results 1 to 20 of 8,870,011 ( 1.926s )| Seller Name | Buyer Name | Product | Transaction Group Ref # | Begin Date | End Date | Trade Date | Quantity | Price | Units | Transmission Charge | Transaction Charge | FERC Tariff Ref | Contract Service Agreement | Contract Filing Type | Contract Execution Date | Contract Commencement Date | Contract Termination Date | Timezone | Balancing Authority | Point of Delivery Hub | Class | Term | Increment | Increment Peaking | Filing Type | Broker Exchange |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NextEra Energy Marketing, LLC | United Illuminating Company, The | REQUIREMENTS SERVICE | 4146868 | 2025-09-01 00:00 | 2025-09-30 23:59 | 2025-01-22 | 48,737.5648 | $92.8067 | $/MWH | $0.00 | $4,523,172.56 | Market-Based Rate Tariff, Volume No. 1, 2.0.0 | 13088 | New | 2008-05-20 | 2008-05-20 | EasternPrevailing2 | ISNE | .Z.CONNECTICUT | Firm | ShortTerm | Monthly | FullPeriod | New | ||
| NextEra Energy Marketing, LLC | United Illuminating Company, The | REQUIREMENTS SERVICE | 4003047 | 2025-09-01 00:00 | 2025-09-30 23:59 | 2024-07-17 | 16,245.8547 | $88.69 | $/MWH | $0.00 | $1,440,844.85 | Market-Based Rate Tariff, Volume No. 1, 2.0.0 | 13088 | New | 2008-05-20 | 2008-05-20 | EasternPrevailing2 | ISNE | .Z.CONNECTICUT | Firm | LongTerm | Yearly | FullPeriod | New | ||
| NextEra Energy Seabrook, LLC | The United Illuminating Company | ENERGY | 212 | 2025-07-01 00:00 | 2025-09-30 23:59 | 2019-11-22 | 99,306.5293 | $38.20 | $/MWH | $0.00 | $3,793,509.42 | Market-Based Rate Tariff, Volume No. 1, 2.1.0 | 18292 | New | 2019-11-22 | 2019-11-22 | 2029-12-31 | EasternPrevailing2 | ISNE | UN.SEABROOK24.5SBRK | UnitPowerSale | LongTerm | Yearly | FullPeriod | New | |
| Constellation Energy Generation, LLC | UNITED ILLUMINATING COMPANY | REQUIREMENTS SERVICE | PDSBCE284 | 2025-09-01 00:00 | 2025-09-30 23:59 | 2024-07-17 | 1,221.5499 | $95.58 | $/MWH | $0.00 | $116,755.74 | FERC Electric, Market-Based Rate Tariff, 7.0.0 | 20461 | New | 2010-02-01 | 2018-01-01 | 2026-06-30 | EasternPrevailing2 | ISNE | CT | Firm | ShortTerm | Monthly | FullPeriod | New | |
United Illuminating Co Name and Address Permutations
Due to the nature of the data we have to make some assumptions when determining if two companies are the same. So to be transparent about how we're calculating some of the summary values, here are all the company names and addresses that were combined to create this record. While we try to make sure everything is as accurate as possible we can't guarantee complete accuracy for all records.
| Company Name | Company Address |
|---|---|
| The United Illuminating Company | 100 Marsh Hill Road Orange, CT 06477 |
| The United Illuminating Company | 180 Marsh Hill Road Orange, CT 06477 |
| United Illuminating Co | 180 Marsh Hill RD Orange, CT 6477 |