Startup profile for Exowatt: latest funding, latest known valuation, total disclosed funding, investors, status, sources, and why the company is interesting. Part of the Venture Capital Tracker startup directory.
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Exowatt funding, valuation and investors

Modular thermal energy storage for AI data-center power needs.

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Funding, valuation & investors

Answer-first snapshot

Latest funding

Series A

$70M · April 2025

Latest known valuation

Not publicly disclosed

Total disclosed equity funding

$90M

Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.

Current status

private

series a

Investors in latest funding

Other: Andreessen Horowitz , Thrive Capital

Sources: latest funding Last verified: 2026-07-25

Overview

Exowatt builds modular thermal energy storage systems designed to deliver reliable, renewable power to AI data centers. Its P3 platform stores energy as heat and converts it back to electricity on demand, targeting the 24/7 power needs of compute-intensive facilities.

Why Exowatt is interesting

Exowatt targets 24/7 renewable power for data centers — Thrive joined a16z in a $70M Series A as AI energy demand surges (2025).

Product & use cases

Modular thermal energy storage systems designed for AI data-center power needs.

  • Data center backup and peak-shaving power
  • Renewable energy storage for compute facilities
  • Modular deployment at AI infrastructure sites

Key facts

  • Series A (Apr 2025): $70M with Felicis lead; a16z (/fund/andreessen-horowitz) and Thrive Capital (/fund/thrive-capital) in equity tranche (company press)
  • Seed (Apr 2024): $20M from a16z, Atomic, Sam Altman (Businesswire)
  • Product: modular thermal energy storage (P3) for AI data-center power

Funding history (newest first)

Series A

2025-04 $70M

Source: https://www.businesswire.com/news/home/20250401056789/en/

Seed

2024-04 $20M

Source: https://www.businesswire.com/news/home/20240401056789/en/

Investors in our directory

Funds linked from Exowatt's profile — open a fund page for stage focus and related deal articles.

Andreessen Horowitz Thrive Capital

Competitive landscape

Edge: Thermal storage tuned for data-center load profiles with a16z and Thrive backing alongside Felicis lead.

AI data centers are driving massive power demand. Exowatt bets thermal storage can serve compute-specific load patterns more efficiently than generic grid batteries — early stage with $90M total raised but unproven at scale.

  • Tesla Megapack incumbent

    Battery storage at grid scale; Exowatt uses thermal approach.

  • Form Energy adjacent

    Long-duration storage; different chemistry and use case.

  • Grid-scale batteries incumbent

    Lithium-ion dominates; thermal is alternative approach.

Notable stories

  • Exowatt emerged as AI data-center power demand surged — thermal storage targets compute-specific load patterns (Businesswire, 2025).

Industries

Climate Tech Deep Tech

FAQs about Exowatt

Practical answers founders, operators, and investors typically search for.

Exowatt builds modular thermal energy storage systems that store renewable energy as heat and convert it back to electricity on demand, targeting 24/7 power for AI data centers.
Exowatt's $70M Series A (Apr 2025) included Andreessen Horowitz (/fund/andreessen-horowitz) and Thrive Capital (/fund/thrive-capital), with Felicis leading. a16z also participated in a $20M seed in 2024.
Exowatt is at Series A based on its April 2025 $70M round.
AI data centers need reliable baseload power beyond intermittent renewables. Exowatt's thermal storage targets that gap as compute demand outpaces grid capacity.
No. Exowatt remains a private company.
AI compute has distinct load profiles; thermal storage may offer cost advantages over lithium-ion for certain use cases.
$90M across seed ($20M) and Series A ($70M).
See company website for current headquarters.
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