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Fourth Power

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A thermal battery energy storage company

Cambridge, United StatesFounded 2021Energy
Valuation $100–250M Last recorded · 2025
Headcount <100 Current team size
Total funding $10–50M Disclosed equity funding
Unlock exact values This page shows ranges. Dealroom has the exact numbers for Fourth Power and the history behind them.

About Fourth Power

Fourth Power, accessible at gofourth.com, is a pioneering startup focused on climate change mitigation through innovative energy storage solutions. The company has developed a unique thermal battery system that harnesses excess wind and solar energy, making it cost-competitive with traditional fossil fuels. This technology is designed to meet the needs of utility companies and energy regulators worldwide.

The core of Fourth Power's technology lies in its thermal battery, which operates at extremely high temperatures—almost half the temperature of the sun. This high power density allows the system to store and release energy efficiently. The battery's subsystems are housed separately within an argon environment, which makes the system safe from fire risks and chemical degradation. This modular design also allows energy and power to be scaled independently, providing flexibility and efficiency.

Fourth Power primarily serves utility companies and energy regulators who are looking for cost-effective, reliable, and scalable renewable energy storage solutions. The company operates in the renewable energy market, specifically focusing on energy storage technologies.

The business model of Fourth Power revolves around the development, manufacturing, and sale of its thermal battery systems. The company generates revenue by selling these systems to utility companies and other large-scale energy providers. Additionally, Fourth Power may engage in partnerships and collaborations with governmental and non-governmental organizations to further its reach and impact.

In 2023, Arvin, who has extensive expertise in energy markets and has held leadership positions with Advanced Energy Economy and the U.S. EPA, joined as CEO. Under his leadership, Fourth Power aims to make renewable energy the most cost-effective and accessible source of power generation through its advanced thermal storage technology.

Source: Dealroom company data

At a glance

Status
Operational
Founded
2021
Headquarters
Cambridge, United States
Employees
35
Open positions
1
Dealroom signal
92.1/100
Sub-industry
Energy Storage
Sector
Energy, Battery, Spinout, Sustainable Development Goals, Thermal Energy Storage, Climate Tech, Stationary Energy Storage, Grid Energy Storage, NIF defense security and resilience, NIF Energy Security and Climate Change
Technology
Hardware, Deep Tech
Business model
Manufacturing
Client focus
b2b

Funding history

3 recorded events

Company financing events and reported valuations.

Deal typeDateAmountValuationInvestorsSource
SERIES A✓Equity / VC Sep 2025 $20M $80M DCVC · Breakthrough Energy Ventures · Munich Re Ventures ↗
SERIES A✓Equity / VC Dec 2023 $19M $76M The Black Venture Capital Consortium · DCVC · Breakthrough Energy Ventures ↗
Showing the latest 2 of 3 recorded eventsBook a demo for the full funding history →

Growth signals

Fourth Power website traffic

Latest recorded traffic for Fourth Power is 4.7K monthly website visits, down 28.8% over the last three months. Fourth Power's team grew 34.6% over the past year.

Latest monthly visits4.7K 3-month web change-28.8% 1-year team growth+34.6%
Summary metrics are public; monthly history is available with a demoCompare with peers →

Similar companies

Closest operating peers by Dealroom taxonomy

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Showing 8 of the closest matchesCompare every metric →

Investments and acquisitions

Capital deployed

Recent portfolio relationships for companies that also act as investors or acquirers.

Investors

6 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Series A4 investors entered at this stage

  • The Black Venture Capital Consortium
  • DCVC
  • Breakthrough Energy Ventures
  • Munich Re Ventures

Other known investors2 additional known investors

  • Massachusetts Institute of Technology
  • Technology Pioneers | World Economic Forum
Team profiled 6 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
1 countries with
team presence
🇺🇸 United States100%
1 country shown

Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Fourth Power on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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