Series B Funded Energy Startups
Across the 50 most recent Series B energy rounds shown (sorted newest first), the largest disclosed round is Antora Energy’s $150M on 2024-02-22, and it si…
Across the 50 most recent Series B energy rounds shown (sorted newest first), the largest disclosed round is Antora Energy’s $150M on 2024-02-22, and it sits far above the rest of the disclosed amounts (the next-largest disclosed figures include Base Power’s $200M on 2025-04-09 and Electra’s $186M on 2025-04-24, while many rounds cluster between the mid-teens and $70M). The distribution also shows multiple funding concentrations: several Series B closings cluster in late Q1 to spring 2025 (for example, Gridware $55M on 2025-11-23 is separate, while a tighter run includes Electra $186M on 2025-04-24, Base Power $200M on 2025-04-09, and Crux $50M on 2025-04-16), and a handful of cities repeat within the list such as Cambridge, with Echoion Technologies ($37M, 2024-06-13), SYSO Technologies ($15M, 2024-08-06), and ZwitterCo ($58M, 2024-07-09).
The stage is uniformly Series B in every row, but disclosure is uneven: 10 of 50 rounds are marked undisclosed (including Enerbank Japan on 2025-11-25 and CorPower Ocean on 2025-07-07), which affects outlier detection. Temporally, the window spans 2023-10-17 (EnergyX) through 2025-11-25 (Enerbank Japan and Neuron Energy).
Most recent rounds
50 shownRelated listings
Frequently asked
What are the biggest disclosed Series B rounds in this energy list, and how stark are the gaps to the rest?
The largest disclosed amount is Base Power’s $200M on 2025-04-09; this is followed by Electra’s $186M on 2025-04-24 and Antora Energy’s $150M on 2024-02-22. Those figures stand out against the many other disclosed rounds that frequently sit in the mid-teens to ~$70M range (for example, enspired $17M on 2025-10-14 and VEIR $75M on 2025-01-28).
Are there notable date-window clusters among these most recent Series B energy rounds?
Yes. A dense mid-2025 run includes several April 2025 closings such as Electra ($186M, 2025-04-24), Base Power ($200M, 2025-04-09), Crux ($50M, 2025-04-16), and Parity ($19M, 2024-06-11 is outside; another anchor later is Aira $69M on 2024-10-16, but April 2025 itself is tight). The list also shows repeated late-2024 to early-2025 activity (for example, Aira $69M on 2024-10-16 and VEIR $75M on 2025-01-28).
Which cities show up repeatedly, indicating potential hub concentration?
Cambridge, Massachusetts appears more than once: ZwitterCo ($58M, 2024-07-09), Echion Technologies ($37M, 2024-06-13), and SYSO Technologies ($15M, 2024-08-06) are all in Cambridge. The same pattern is smaller in other places (e.g., Toronto appears twice with Parity ($19M, 2024-06-11) and SWTCH ($27M, 2024-04-18)).
How much does disclosure variability (undisclosed rounds) affect what analysts can infer from outliers?
Undisclosed rounds account for 10 of 50 entries, including Enerbank Japan (2025-11-25), Coremins (2025-09-16), and XENDEE Corporation (2025-09-08). Because those rows lack amounts, comparisons of “largest” and “smallest” can only be made reliably across the 40 disclosed rounds (for instance, the smallest disclosed amount is MGA Thermal’s $3M on 2024-12-03, rather than any undisclosed row).
Are there any clear temporal edges to pay attention to when building outreach or deal-screening shortlists?
The newest rounds in the list are dated 2025-11-25 with Enerbank Japan (undisclosed) and Neuron Energy ($3M). The oldest row shown is 2023-10-17 (EnergyX, $50M), so the dataset spans roughly from late 2023 through late 2025, which matters when comparing early-to-mid cycle follow-on cadence.
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