| Type | Renewable energy source |
| Impact | Transformed societies and economies |
| Main components | Heat (from the earth's core) • Geothermal power plant • Heat exchanger and generator |
| Origin discovery | 1800s |
| Alternate history | Primary energy source |
| Examples of applications | Heating and cooling systems • greenhouse farming • district heating |
| Effects on the environment | Had a profound impact |
| Role in this alternate timeline | Replaced fossil fuels, shaped international relations |
