| ELLIE'S COVE HOMEOWNERS ASSOCIATION, INC.Gulf Breeze, FL · Active | Gulf Breeze, FL | Nonprofit | Jan 21, 2025 | Active |
| TECO HOLDINGS, INC.Tampa, FL · Active | Tampa, FL | Corporation | Feb 23, 2024 | Active |
| SECI MITLAND CORPORATIONTampa, FL · Active | Tampa, FL | Corporation | Nov 8, 2019 | Active |
| TECO CLEAN ADVANTAGE CORPORATIONTampa, FL · Active | Tampa, FL | Corporation | Feb 14, 2012 | Active |
| SEACOAST GAS TRANSMISSION, LLCTampa, FL · Active | Tampa, FL | LLC | Jun 4, 2008 | Active |
| TECO GEMSTONE, INC.Tampa, FL · Active | Tampa, FL | Corporation | Nov 26, 2007 | Active |
| TECO COALBED METHANE FLORIDA, INC.Tampa, FL · Active | Tampa, FL | Corporation | Dec 23, 2002 | Active |
| TECO PARTNERS, INC.Tampa, FL · Active | Tampa, FL | Corporation | Sep 1, 2000 | Active |
| HOPE ARISE CHURCH, INC.West Palm Beach, FL · Active | West Palm Beach, FL | Nonprofit | Aug 20, 2018 | Active |
| TAMPA ELECTRIC COMPANYTampa, FL · Active | Tampa, FL | Corporation | Apr 18, 1949 | Active |
| TECO PROPERTIES CORPORATIONTampa, FL · Active | Tampa, FL | Corporation | Jul 26, 1966 | Active |
| BAY POINT PROPERTY OWNER'S ASSOCIATION, INC.Miami, FL · Active | Miami, FL | Nonprofit | Jan 15, 1962 | Active |
| GRAVY PROJECTS, LPMiami Beach, FL · Inactive | Miami Beach, FL | Partnership | Jul 21, 2014 | Inactive |
| TECO FINANCE, INC.Tampa, FL · Active | Tampa, FL | Corporation | May 4, 1987 | Active |
| TECO WHOLESALE GENERATION, INC.Tampa, FL · Active | Tampa, FL | Corporation | May 26, 1987 | Active |
| TECO DIVERSIFIED, INC.Tampa, FL · Active | Tampa, FL | Corporation | Oct 15, 1987 | Active |
| 468 ESCAPE, LLCProminence, FL · Inactive | Prominence, FL | LLC | Jul 17, 2014 | Inactive |
| ENGAGE 365 LLCOrlando, FL · Inactive | Orlando, FL | LLC | Mar 16, 2020 | Inactive |
| NEW CHURCH OF FAITH TAMPA INC.Orlando, FL · Inactive | Orlando, FL | Nonprofit | Jul 20, 2016 | Inactive |
| LIBERTY NEW YORK TITLE SERVICES INC.Largo, FL · Inactive | Largo, FL | Corporation | Sep 30, 2004 | Inactive |
| GRAVY GP, INC.Miami Beach, FL · Inactive | Miami Beach, FL | Corporation | Jul 21, 2014 | Inactive |
| PEOPLES GAS SYSTEM, INC.Tampa, FL · Active | Tampa, FL | Corporation | May 24, 2021 | Active |
| TECO OIL & GAS, INC.Tampa, FL · Active | Tampa, FL | Corporation | Apr 7, 1995 | Active |