Exhibit 21
| Talen Energy Corporation | ||
| Subsidiaries of the Registrant | ||
| At December 31, 2015 | ||
| Company Name | State or Jurisdiction of | |
| Business Conducted under Same Name | Incorporation/Formation | |
| Barney M. Davis, LP | Texas | |
| Bayonne Plant Holding, L.L.C. | Delaware | |
| BDW Corp. | Delaware | |
| Bell Bend Holdings, LLC | Delaware | |
| Bell Bend, LLC | Delaware | |
| B-G Mechanical Contractors, Inc. | Massachusetts | |
| B-G Mechanical Service, Inc. | Massachusetts | |
| Brandon Shores LLC | Delaware | |
| Brunner Island Services, LLC | Pennsylvania | |
| Brunner Island, LLC | Delaware | |
| Burns Mechanical, Inc. | Pennsylvania | |
| C.P. Crane LLC | Delaware | |
| C/R Topaz Holdings, LLC | Delaware | |
| Camden Plant Holding, LLC | Delaware | |
| Colstrip Comm Serv, LLC | Delaware | |
| Dartmouth Plant Holding, LLC | Delaware | |
| Dartmouth Power Associates Limited Partnership | Massachusetts | |
| Dartmouth Power Generation, L.L.C. | Delaware | |
| Dartmouth Power Holding Company, L.L.C. | Delaware | |
| Elmsford Sheet Metal Works, Inc. | New York | |
| Elmwood Energy Holdings, LLC | Delaware | |
| Elmwood Park Power, LLC | Delaware | |
| Form Armistead Road-Lot 15 Landfill LLC | Delaware | |
| Fred Williams, Inc. | Massachusetts | |
| General Control Systems, Inc. | New York | |
| H.A. Wagner LLC | Delaware | |
| H.T. Lyons Co. (90% ownership interest) | Pennsylvania | |
| H.T. Lyons, Inc. | Pennsylvania | |
| Holtwood, LLC | Delaware | |
| Interstate Energy Company | Delaware | |
| Jade Power Generation Holdings LLC | Delaware | |
| Lady Jane Collieries, Inc. | Pennsylvania | |
| Laredo WLE, LP | Texas | |
| Liberty View Power, L.L.C. | Delaware | |
| Lower Mount Bethel Energy, LLC | Delaware | |
| MACH Gen GP, LLC | Delaware | |
| MACH Gen, LLC | Delaware | |
| Martins Creek, LLC | Delaware | |
| McCarl's Inc. | Pennsylvania | |
| McClure Company | Pennsylvania | |
| MEG Generating Company LLC | Delaware | |
| MEG Yellow Pine, LLC | Delaware | |
| Millennium Builders, Inc. | Connecticut | |
| Millennium Power Partners, L.P. | Delaware | |
| Montour Services, LLC | Pennsylvania | |
| Montour, LLC | Delaware | |
| Morris Energy Management Company, LLC | Delaware | |
| Morris Energy Operations Company, LLC | Delaware | |
| NBCP Urban Renewal Corporation | New Jersey | |
| NBCP Urban Renewal Partnership | New Jersey | |
| Newark Bay Cogeneration Partnership, L.P. | New Jersey | |
| Newark Bay Holding Company, L.L.C. | Delaware | |
| New Athens Generating Company, LLC | Delaware | |
| New Harquahala Generating Company, LLC | Delaware | |
| New MACH Gen, LLC | Delaware | |
| Nueces Bay WLE, LP | Texas | |
| Pedricktown Cogeneration Company LP | New Jersey | |
| Pedricktown Investment Company LLC | Delaware | |
| Pedricktown Management Company LLC | Delaware | |
| Pennsylvania Mines, LLC | Delaware | |
| Raven FS Property Holdings, LLC | Delaware | |
| Raven Lot 15 LLC | Delaware | |
| Raven Management MM Inc. | Delaware | |
| Raven Power Finance LLC | Delaware | |
| Raven Power Fort Smallwood LLC | Delaware | |
| Raven Power Generation Holdings LLC | Delaware | |
| Raven Power Group LLC | Delaware | |
| Raven Power Marketing LLC | Delaware | |
| Raven Power Operating LLC | Delaware | |
| Raven Power Property LLC | Delaware | |
| Realty Company of Pennsylvania | Pennsylvania | |
| Sapphire Power Finance LLC | Delaware | |
| Sapphire Power Generation Holdings LLC | Delaware | |
| Sapphire Power LLC | Delaware | |
| Sapphire Power Marketing LLC | Delaware | |
| SavageALERT, Inc. | Connecticut | |
| Susquehanna Nuclear, LLC | Delaware | |
| Talen Energy Holdings, Inc. | Delaware | |
| Talen Energy Marketing, LLC | Pennsylvania | |
| Talen Energy Services Group, LLC | Delaware | |
| Talen Energy Services Holdings, LLC | Delaware | |
| Talen Energy Services Northeast, Inc. | Massachusetts | |
| Talen Energy Supply, LLC | Delaware | |
| Talen Generation Services, LLC | Delaware | |
| Talen Generation, LLC | Delaware | |
| Talen Investment Corporation | Delaware | |
| Talen Ironwood Holdings, LLC | Delaware | |
| Talen Ironwood, LLC | Delaware | |
| Talen Land Holdings, LLC | Pennsylvania | |
| Talen Montana Holdings, LLC | Delaware | |
| Talen Montana, LLC | Delaware | |
| Talen New Jersey Biogas, LLC | Delaware | |
| Talen New Jersey Solar, LLC | Delaware | |
| Talen Nuclear Development, LLC | Delaware | |
| Talen Prescott, LLC | Delaware | |
| Talen Spectrum, Inc. | Pennsylvania | |
| Talen Treasure State, LLC | Delaware | |
| Topaz Power Group GP II, LLC | Delaware | |
| Topaz Power Group LP II, LLC | Delaware | |
| Topaz Power Group, LLC | Delaware | |
| Topaz Power Holdings, LLC | Delaware | |
| Topaz Power Management II GP, LLC | Delaware | |
| Topaz Power Management II LP, LLC | Delaware | |
| Topaz Power Property Management II, LP | Texas | |
| Trystate Mechanical, Inc. | New York | |
| York Generation Company LLC | Delaware | |
| York Plant Holding, LLC | Delaware | |