CO2 Storage technology

The CO2 Battery technology from Energy Dome is long duration, efficient energy storage. (Other New Battery technologies here). An Italian company, based on a closed-loop thermodynamic process that efficiently stores energy by manipulating CO2 under different state conditions. The CO2 Battery can operate in charging mode (absorbing power from the grid) and discharging mode (returning power to the grid). Batteries are essential for the change to renewable Energy.

  • Charging mode. The CO2 is compressed and stored under pressure at ambient temperature in a high-density supercritical or liquid state.
  • Discharging mode. The CO2 is expanded into a turbine and stored back into an atmospheric gasholder, releasing the energy to the grid.
  • It is a closed-loop system with zero-emission to the atmosphere.
  • The components are existing technology including an expander, a compressor, plus a tank. The Thermal Energy Storage Systems they call a “TES”

CO2 Battery Technology Claimed to be Cost Competitive

Energy Dome claim in Inceptive Minds they say the battery can offer a Levelised Cost Of Storage (LCOS) as low as US$50-60 per MWh within a few years, whereas lithium batteries are sitting between US$132-245/MWh. (These figures appear to be too high). Community Batteries in Australia come out at $100 per MWh) Besides, Energy Dome’s thermodynamic liquid-CO2 system has a round-trip efficiency of 75-80% – higher than any other long-duration energy storage technology currently on the market, including liquid-air, compressed-air, and gravity-based solutions.

You Tube Link from the Company

From Energy Dome

Energy Bricks

co2 battery technolgoy claimed to be off the shelve and cost competitive
Image from Dome Energy


CO2 is the perfect fluid to store energy cost effectively in a closed thermodynamic process as it is one of the few gases that can be condensed and stored as a liquid under pressure at ambient temperature. This allows for high density energy storage without the need to go at extreme cryogenic temperatures.

By storing in the liquid phase at ambient temperature, the system significantly reduces the typical storage costs associated with CAES (Compressed Air Energy Storage) without having to deal with cryogenic temperatures associated with LAES (Liquid Air Energy Storage).

It appears that it can be scaled up and there is plenty of CO2!