United States · 
Who invested in ThermaSource?
ThermaSource's investors include Rustic Canyon Partners, Riverstone Holdings and US Renewable Group.
United States · Series B startup
Who invested in ThermaSource
One round we have observed, with the 3 investors named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Funding summaryUpdated 26 Oct 2026
$42Mraised across 1 round since 2008, from 1 source
- Latest round
- Series B, $42MApr 2008
- Investors
- 3
The rounds
- Apr 2008
Everyone who backed them
US Renewable GroupVC firm1round
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Quick answers about ThermaSource
How much has ThermaSource raised?
ThermaSource has raised $42M across 1 round since 2008.
When did ThermaSource last raise?
ThermaSource's most recent round was a Series B of $42M in Apr 2008.
What was ThermaSource's biggest round?
Its most recent round, $42M in Apr 2008, is also its largest on record.
Who backed ThermaSource first?
ThermaSource's first round on record, in Apr 2008, was backed by Rustic Canyon Partners, Riverstone Holdings and US Renewable Group.
What stage is ThermaSource at?
ThermaSource's latest named round is a Series B, in Apr 2008.
Where is ThermaSource based?
ThermaSource is based in the United States.
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