14 Best Thermal Energy Storage Startups to Watch in 2025

The Definitive Seedtable Ranking of Thermal Energy Storage Startups

We track 71,000+ companies and rank them dynamically using our Seedtable Score – a score that uses quantitative and qualitative data points to signal the momentum behind a company. We then monitor the list manually leveraging our expertise as founders and investors.

There are 14 start-ups with an aggregate funding of $1.2b. The average funding per company in this subset is $83.1m.

Last update to the database: Feb 18, 2025. See changelog.

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9

Funding Rounds

$812.4m

Money raised

BrightSource Energy is an Oakland, California-based company founded in 2006 by Arnold Goldman.

5

Funding Rounds

$53.5m

Money raised

Kraftblock provides an eco-friendly, modular thermal energy storage system.

Location:

Key people:

3

Funding Rounds

$23.6m

Money raised

Nostromo is a company founded in 2017.

5

Funding Rounds

$167.5m

Money raised

Malta Inc is a company storing renewable energy in molten salt founded by X.

2

Funding Rounds

$4.0m

Money raised

Skyven Technologies is a company founded in 2013 by Arun Gupta.

Key people:

1

Funding Rounds

$50.0m

Money raised

Antora Energy is building a low-cost thermal battery for grid-scale energy storage.

2

Funding Rounds

$7.6m

Money raised

Axiom Exergy provides active power management services to portfolios of commercial and industrial buildings with large thermal loads.

Key people:

1

Funding Rounds

$970.0k

Money raised

Stash Energy is a provider of energy storage and management systems allowing energy systems to store energy during non-peak periods.

3

Funding Rounds

$6.2m

Money raised

MGA Thermal is a Newcastle, New South Wales-based technology startup developing advanced thermal storage.

2

Funding Rounds

$11.1m

Money raised

Heat battery storage systems designed for industrial and residential use.

1

Funding Rounds

$297.7k

Money raised

EnergyNest is a Billingstad-based developer of technology for storing and managing thermal energy.

1

Funding Rounds

$19.0m

Money raised

Imagine industry, without combustion. At Electrified Thermal Solutions, we've re-invented the firebrick to electrify industrial heat.

Key people:

1

Funding Rounds

$1.9m

Money raised

Viking Cold Solutions is an Houston-based company founded in 2010 by Paul Robbins.

Location:

Key people:

1

Funding Rounds

$5.7m

Money raised

Azelio, a Swedish company with a unique Stirling-based system with thermal energy storage for dispatchable electricity production.

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