Loading organizations...
Sizable Energy develops offshore pumped hydro energy storage systems, adapting traditional pumped hydro technology for marine environments. Its core product utilizes the ocean to create flexible, long-duration energy storage solutions, capable of integrating significant amounts of intermittent renewable energy into global power grids. This technical approach addresses land constraints and geographical limitations often associated with conventional pumped hydro.
The company was founded in 2022 by Dr. Manuele Aufiero, Stefano Bernardi, and Carlo Fiorina. Their shared insight was to reimagine the proven efficacy of pumped hydro by moving it to sea, recognizing the ocean's vast potential for large-scale energy storage. Dr. Aufiero, serving as CEO and a co-founder, brings a background in innovative energy solutions, driving the company's efforts to harness oceanic environments for grid stability.
Sizable Energy’s solutions are designed for utility-scale energy providers and grid operators who require reliable, scalable methods for balancing renewable energy generation. The company's vision is to establish its technology as a foundational component of the global energy transition, enabling the widespread adoption of clean power by offering a sustainable and effective means of storing energy at sea.
Sizable energy has raised $8.0M across 1 funding round.
Sizable energy has raised $8.0M in total across 1 funding round.
Sizable Energy is an Italy-based technology company developing gigawatt-scale, long-duration energy storage (LDES) using patented offshore pumped-hydro technology.[1][2][3] Founded by engineers from nuclear, mechanical, energy, and maritime fields, it stores energy by pumping saturated sea-salt brine (heavier than seawater) from seabed reservoirs to surface floating reservoirs, leveraging ocean depths for efficiency and scalability from single-digit to hundreds of GWh.[1][2][3] The system addresses onshore pumped hydro's limitations like slow builds, geographic constraints, and environmental issues, targeting a low levelized cost of storage with modular design, high round-trip efficiency, zero land use, and compatibility with existing maritime infrastructure.[1][3] It serves grid operators and renewable energy developers needing reliable, cost-effective LDES to support the energy transition, with the International Energy Agency projecting a need for up to 120 TWh by 2040—ten times current capacity.[1][2] Recent $8M funding led by Playground Global (with Verve Ventures and Unruly Capital) fuels acceleration toward commercial deployment, following wave-basin tests at MARIN and upcoming sea trials off Reggio Calabria, Italy.[1][2][5]
Sizable Energy SRL was established in 2022 in Italy by a team of specialized engineers, including Co-founder and CEO Manuele Aufiero, Co-founder Carlo Fiorina, and Co-founder plus founding investor Stefano Bernardi.[3][4] The founders drew from their expertise in nuclear, mechanical, energy, and maritime engineering to revive pumped hydro—the most proven storage tech—by adapting it for offshore use amid the rapid global energy transition's demand for scalable LDES.[1][2][3] Early traction came from technology de-risking via wave-basin lab tests and open-ocean proof-of-concepts, with pivotal milestones including reliable operation validation in harsh conditions at the Maritime Research Institute Netherlands (MARIN) and the launch of a new Mediterranean sea trial off Reggio Calabria to test floating components and deployment processes ahead of a multi-MWh demonstration plant.[1][2][3]
Sizable Energy stands out in the LDES market through these key advantages:
Sizable Energy rides the explosive growth in renewables, where intermittent solar and wind demand massive LDES to stabilize grids—projected at 120 TWh by 2040 amid onshore pumped hydro's constraints.[1][2] Timing is ideal as offshore wind/PV scale up, enabling synergetic coupling, while global maritime infrastructure supports fast, modular rollout versus years-long land projects.[3] Market forces like energy transition urgency, geographic flexibility (Mediterranean to Oceania), and cost pressures favor its solution, influencing the ecosystem by unlocking ocean-based storage to make grids resilient and economical, potentially redefining LDES deployment worldwide.[1][3]
Next steps include completing Reggio Calabria sea trials and building a multi-MWh Mediterranean demonstration, accelerating via $8M funding toward commercial gigawatt-scale plants.[1][2] Trends like surging offshore renewables, LDES mandates, and climate-driven grid upgrades will propel growth, with Sizable's offshore pivot positioning it to capture a slice of the 10x capacity explosion. Its influence may evolve from pioneer to category leader, humanizing the energy transition through engineer-led innovation that turns ocean depths into grid-saving reservoirs—proving tech companies like Sizable can scale reliability where land falls short.[1][3]
Sizable energy has raised $8.0M across 1 funding round. Most recently, it raised $8.0M Seed in October 2025.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Oct 1, 2025 | $8M Seed | — | BOW Capital, Playground Global, Revolution Growth, Schematic Ventures | Announced |
Sizable energy has raised $8.0M in total across 1 funding round.
Sizable energy's investors include Bow Capital, Playground Global, Revolution Growth, Schematic Ventures.
