Geothermal Engineering Ltd (GEL)
Deep geothermal power and lithium in the UK
Ranked #9 in Best Geothermal Energy Companies.
Geothermal Engineering Ltd runs the United Downs plant in Cornwall, the UK's first deep geothermal power plant, which began delivering continuous power on 26 February 2026. The site also produces lithium from its geothermal brine.
At a glance
| Price from | Custom |
| Best for | UK energy buyers wanting local geothermal power |
From Geothermal Engineering Ltd (GEL)'s own website.
What stands out
- First geothermal power plant in the UK
- Extra revenue from lithium
Worth knowing
- Small output so far
- Focused on UK sites
How it ranks
Geothermal Engineering Ltd (GEL) is ranked 9th of 10 in Best Geothermal Energy Companies (Lister Score 86.8).
#9 in Best Geothermal Energy Companies · Lister Score 86.8
GEL signed a long-term agreement with Octopus Energy for at least 3 MW of United Downs output..
| Rank | Best Geothermal Energy Companies | Score |
|---|---|---|
| 1 | Fervo Energy | 97.5 |
| 2 | Ormat Technologies | 96.2 |
| 3 | Eavor Technologies | 94.9 |
| 4 | Quaise Energy | 93.6 |
| 5 | Sage Geosystems | 92.3 |
| 6 | Mazama Energy | 91.0 |
| 7 | XGS Energy | 89.6 |
| 8 | Zanskar | 88.2 |
| 9 | Geothermal Engineering Ltd (GEL) | 86.8 |
| 10 | Rodatherm Energy | 85.4 |
Frequently asked questions
How does Geothermal Engineering Ltd (GEL) rank on Lister?
Geothermal Engineering Ltd (GEL) is ranked 9th of 10 in Best Geothermal Energy Companies (Lister Score 86.8).
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