August 1, 2025: Google has made an undisclosed investment in Italian energy tech firm Energy Dome and has signed a commercial arrangement to use the technology to help power its operations.

Energy Dome said on July 25 the commercial agreement aims to develop its ‘CO2 Battery’ projects in all key geographical strategic areas, including Europe, America, and the Asia-Pacific region, with the goal of scaling up deployment at a rapid pace to meet Google’s 2030 carbon-free energy goals.

A pipeline of sites and projects has been identified in the partnership, which are currently in development and contracting stages.

Google said its investment in the Milan-based firm coincides with the company entering a “growth phase of commercial deployment”, and multiple projects already contracted, including with Alliant Energy in the US, Engie in Italy and NTPC in India.

Energy Dome claims its CO2 Battery is capable of continuously dispatching energy for periods of eight to 24 hours to meet both the baseload and flexibility requirements of large energy users.

The company has said previously its technology uses CO2 in a closed-loop charge/discharge cycle as a storage agent. 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.

Maud Texier, director of EMEA Energy at Google, said the internet giant was committed to power its operations with clean energy and Energy Dome could help unlock rapid progress.
“By helping to scale this first-of-a-kind long duration energy storage technology, we hope to help communities everywhere gain greater access to reliable, affordable electricity and support grid resilience as we integrate more renewable energy sources.”

In 2022, Energy Dome said it signed a deal to expand use of its technology in partnership with Italy’s Ansaldo Energia.