Welcome to the dawn of a new era in energy storage. Sizable Energy is revolutionizing the landscape of long duration storage by breathing new life into pumped hydro - the most reliable storage technology that is struggling to keep up with the rapid energy transition. By ingeniously taking pumped hydro offshore, we've unlocked a new horizon of scalable, unlimited deployment potential
Offshore Pumped Hydro Energy Storage
Leveraging on existing technologies
Modular and scalable design
Short development and deployment times
Synergetic coupling with Floating Wind and PV
Local manufacturing and superior supply chain resiliency
High round trip efficiency
Zero land use
Unbeatable social and environmental sustainability
Highly competitive economics


Sizable Energy patented technology combines the established technology of pumped hydro with the vast scalability of offshore deployment. The design is straightforward, comprising a reservoir on the ocean floor, another floating on the surface, a connecting pipe, and reversible pump-turbines for moving saturated sea salt brine between these two reservoirs.

Making it happen

We've already progressed in the technology de-risking and demonstration through experimental campaigns in wave basins and proof of concepts demonstrations at sea.
Ideal locations already confirmed in 50+ countries in every continent.

Global reach:

Boundless deployment opportunities
Mediterranean regions
North & Central America
South America
Middle East
East Asia
South-East Asia
India & Maldive
Talented individuals driving innovation and sustainability


Manuele Aufiero
Co-founder, CEO
Carlo Fiorina
Stefano Bernardi
Co-founder, Founding investor
Ilmas Bayati
Consultant - Offshore testing lead
Simone Biondi
Consultant - Business development lead
Mirko Millefanti
Consultant - Procurement and Mechanical design
Lorenzo Gardoni
Energy engineer
Sara Maffioli
Geoinformatic engineer
VAT IT12516700965
All rights reserved
Cookies managing
We use cookies for website functionality, personalized advertising, and analysis. By clicking 'Accept All,' you consent to these purposes. Select 'Decline' for essential cookies only. Adjust settings anytime under 'Cookie Settings'.
Cookies managing
Cookie Settings
Cookies necessary for the correct operation of the site are always enabled.
Other cookies are configurable.
Essential cookies
Always On. These cookies are essential so that you can use the website and use its functions. They cannot be turned off. They're set in response to requests made by you, such as setting your privacy preferences, logging in or filling in forms.
Analytics cookies
These cookies collect information to help us understand how our Websites are being used or how effective our marketing campaigns are, or to help us customise our Websites for you. See a list of the analytics cookies we use here.
Advertising cookies
These cookies provide advertising companies with information about your online activity to help them deliver more relevant online advertising to you or to limit how many times you see an ad. This information may be shared with other advertising companies. See a list of the advertising cookies we use here.