Monthly roundup · Energy · September 2026

Energy startup funding, September 2026: Crusoe's $3.9B Series F leads 21 rounds

By Millionrounds ResearchPublished 1 October 2026Updated 1 November 2026

We read 21 equity rounds in Energy announced in September 2026, raising $4.7B between them: 6% of all the rounds we read that month and 12% of the money. The largest was Crusoe's $3.9B Series F, led by Valor Equity Partners and Atreides Management. The median seed round was $5.0M, against $5.0M over the last twelve months in Energy; at Series A it was $46M. 1GT led the most rounds, with 2.

Equity rounds21in Energy, 20 with an amount

Raised$4.7Bacross those rounds

Lead named100%of rounds say who led

Share of the month6%of rounds; 12% of the money

The biggest rounds

Day by day

Equity rounds in Energy announced each day of September. The busiest day was 1 September, with 4.

1 September30 September

By stage, against the year

Each stage's median this month beside its twelve-month median: the sector's own where we hold enough rounds for a benchmark, otherwise the one across all sectors.

Pre-seed3$1.5Mthis month$2.0M12 months, all sectors

Seed7$5.0Mthis month$5.0M12 months here

Series A3$46Mthis month$26M12 months here

Series B2$101Mthis month$50M12 months, all sectors

Growth4$89Mthis month$113M12 months, all sectors

The most active leads

Firms that led two or more of the month's rounds in Energy.

1GTAmber, Amber Electric2 led

Where

United States had the most Energy rounds this month.

Against the month

Rounds, Energy21
Rounds, all sectors357
Raised, Energy$4.7B
Raised, all sectors$39B

The whole of September 2026