RANKINGS
Key list: geothermal power plant operators by capacity
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This month our power industry key list brings you the 15 largest geothermal power plant operators by capacity, as ranked by GlobalData's Power Intelligence Centre. All numbers up to date as of May 2021.
| Company name | Entity type | Number of employees | Active capacity (MW) |
| Calpine Corp | Private | 2,256 | 2,885 |
| Lopez Inc | Private | - | 2,320 |
| Ormat Technologies Inc | Public | 1,402 | 1,451 |
| Comision Federal de Electricidad | Government | - | 918 |
| Terra-Gen Holdings LLC | Private | - | 691 |
| Contact Energy Ltd | Public | 934 | 569 |
| Star Energy Geothermal (Salak-Darajat) BV | Private | - | 520 |
| Kenya Electricity Generating Co Ltd | Public | 2,519 | 508 |
| Real Goods Solar Inc | Public | 70 | 436 |
| Orkuveita Reykjavikur | Private | 602 | 423 |
| PT Pertamina (Persero) | Government | 31,569 | 367 |
| CalEnergy Generation Operating Co | Private | - | 366 |
| Sarulla Operations Ltd | Private | - | 330 |
| Kipas Holdings A.S | Private | - | 324 |
| Instituto Costarricense de Electricidad | Government | - | 270 |
