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Fourth Power

gofourth.com ↗

PROCESS SCHEMATIC · POWER / GRID / THERMAL BATTERY LIVE

Founded: 2021
Raised: $40M
HQ: CAMBRIDGE, MA
Layer: COMPONENTS

Thermal battery storing energy in graphite blocks and liquid metal.

Funding history

RoundAmountDateLead

Series A$19M2023-12DCVC

Series A Plus$20M2025-09Munich Re Ventures

Related: American Turbines Ayr Energy Aetherflux Base Power

Sources

Fourth Power Secures $19M for Low-Cost Utility-Scale Thermal Energy Storage (Businesswire, Dec 2023) ↗Three breakthroughs that earned Fourth Power its $19M Series A (TechCrunch) ↗Company - Fourth Power ($45M raised) ↗Fourth Power Raises $20 Million to Commercialize Low-Cost Utility-Scale Energy Storage Solution (Businesswire, Sep 2025) ↗