Underground Energy Storage

Sigma Energy Storage’s HT-CAES technology brings underground storage into the 21st century. Energy storage at this massive scale (over 100 MW) is well-suited to meet the seasonal and bulk storage needs of major utilities at a highly competitive price, where suitable caverns are available.


  • Seasonal or strategic energy storage
  • Integrate renewables at utility scale
  • Massive storage capacity in natural megavessels
  • Lowest levelized cost of energy at scale
  • Non-emitting dispatchable power
Get in touch with us to learn more.