Investors

A new asset class in a $200B+ market.

Clean energy storage with lifetime capital cost on par with new natural gas, purpose-built for the two largest buyers of peak power.

The market is moving. The tools haven't kept up.

Demand is projected to grow ~40% this decade, and peak demand is climbing faster than the average. 240 GW across more than 1,000 aging plants is heading for retirement. Every alternative gives something up on cost, duration, or siting. Fourth Power's total addressable market runs over $200B, and nothing on the market today fills it well.

AI is the largest new source of power demand in a generation.

AI load already shows up in the interconnection queues, the utility load projections, and the capital plans companies have filed. Fourth Power sits on both sides of it. We sell to utilities that need peak capacity to serve that load, and to data centers that need flexible storage behind the meter.

The options narrow fast.

Start with the alternatives. Lithium-ion can't hold multi-day duration at a price that pencils. Hundred-hour storage overshoots the use case, and its round-trip efficiency is wrong for peak power. New gas means multi-year turbine waits and a permitting fight. What's left is the aging peaker fleet, 1,000-plus plants going offline right as the new peak arrives. Fourth Power fits peaker economics, multi-day duration, and a one-acre footprint at once. Nothing else does.

Two markets. One system. Both growing.

Fourth Power replaces aging peakers and adds capacity for growing load, at gas economics, without the permitting friction.

Show up with clean, flexible capacity and you move to the front of the line.

Backed by leading climate and deep-tech investors.

Breakthrough Energy Ventures, DCVC, Munich Re Ventures, MassMutual. $45M raised. Team spans MIT, Apple, Rivian, Tesla, U.S. EPA, and decades of power industry experience. Currently operating first-of-a-kind systems in Massachusetts.