September 29, 2022: Italian energy tech company Energy Dome is to conduct a feasibility study into the use of its ‘CO2 Battery’ at one or more renewable power project sites operated by Ørsted, the companies said on September 27.
The partners have signed a memorandum of understanding that includes an option to develop multiple 20MW/200MWh of Energy Dome’s energy storage units — potentially starting construction of the first project at an undisclosed location in continental Europe in the second half of 2024.
The partnership follows Energy Dome’s June 8 announcement that it had completed its first commercial demonstration facility at Sardinia, Italy, and was working on a new commercial utility-scale facility in Sardinia, under a partnership with Italian energy company A2A.
Energy Dome says its technology “can be deployed just about anywhere at less than half the cost of similar-sized lithium ion battery storage facilities and have superior round-trip efficiency, with no performance degradation over a 25-year lifecycle”.
The company says its technology “does not involve scarce and environmentally challenging raw materials like lithium. Instead, it uses carbon dioxide and off-the-shelf components to charge and discharge power from four to 24 hours, enabling renewables to serve as fully-dispatchable daily energy resources”.
CO2 is used in a closed-loop charge/discharge cycle as a storage agent, the firm says. Before charging, gaseous CO2 is kept in a large dome structure.
During charging, electricity from the grid is used to compress the CO2 into liquid form, creating stored heat in the process. During discharge, the liquid CO2 is evaporated using the stored heat, expanded back into its gaseous form, and used to drive a turbine to generate electricity.
Ørsted, majority owned by the Danish state, develops, builds and operates facilities including offshore and onshore wind farms, solar farms and energy storage plants.
Ørsted VP Europe Onshore Kieran White said: “We consider the CO2 Battery solution to be a promising alternative for long-duration energy storage. This technology could potentially help us decarbonize electrical grids by making renewable energy dispatchable.”