Sizable
Offshore pumped brine: the definitive long duration energy storage
Milan, Italy · Founded 2022 · $8.0M raised
- Headquarters
- Milan
- Employees
- 11–50
- Founded
- 2022
- Business Model
- B2B
- Website
- sizableenergy.com
- Total Funding
- $8.0M
- Last Round
- $8.0M SeedOct 2025
- Rounds
- 1
Totals include recorded grants and other qualifying funding, not just equity. What counts toward funding.
Indexed holds 1 funding round and 3 investors for this company. The full record is or through the API.
About
Sizable Energy develops gigawatt-scale offshore pumped hydro energy storage systems that adapt proven pumped hydro technology for marine environments. The company's patented ABYSS system stores energy by pumping high-density saturated sea-salt brine between seabed reservoirs and surface floating reservoirs at ocean depths of several hundred meters, enabling long-duration energy storage with zero land use. Targeting grid operators and renewable energy developers, Sizable's modular design allows power and capacity to be scaled independently, supporting integration of large-scale intermittent solar and wind generation. Founded in 2022 by engineers from nuclear, mechanical, energy, and maritime fields, the company has validated its technology through wave-basin tests at MARIN and is conducting sea trials off Reggio Calabria, Italy.
Summary
Sizable is a Climate Tech company based in Milan, Italy, founded in 2022. It has raised $8.0M in total across 1 round, most recently a $8.0M Seed round in Oct 2025. Investors include Playground Global, VERVE CAPITAL and EXA Ventures.
Tech & App Stack
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Funding History
Oct 2025
Investors
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