Startup profile · funding coverage
Certain Energy funding, valuation and investors
Imperial spinout commercializing manganese flow batteries for long-duration grid storage.
Keep track of Certain Energy
Save this profile to your VCT watchlist for a quick return.
Funding, valuation & investors
Answer-first snapshotLatest funding
Series A
£10M · August 2026
Latest known valuation
Not publicly disclosed
Total disclosed equity funding
Not publicly disclosed
Excludes debt, grants, acquisitions, secondaries, and IPO proceeds.
Current status
private
series a · London, United Kingdom
Investors in latest funding
Lead: British Business Bank
Other: Centrica , Ceres Power Holdings , Temasek Trust C3H
Overview
Certain Energy (formerly RFC Power) is a London long-duration energy storage company spun out of Imperial College London in 2017. It develops manganese-based flow batteries whose duration scales with electrolyte tank size. On August 26, 2026 it closed a £10 million Series A led by the British Business Bank, with Centrica, Ceres Power Holdings, and Temasek Trust’s Catalytic Capital for Climate and Health participating.
Why Certain Energy is interesting
August 2026 £10M Series A led by British Business Bank with Centrica, Ceres, and Temasek Trust C3H — targeting UK curtailment waste and an India MWh-class demo.
Product & use cases
Manganese flow battery systems for multi-hour to multi-day renewable storage and grid stabilization.
- Absorb renewable oversupply / cut curtailment
- Long-duration discharge during low generation
- Potential peaker displacement over time
Key facts
- Series A (Aug 26, 2026): £10M led by British Business Bank (£3.5M cited)
- Participants: Centrica, Ceres Power, Temasek Trust C3H
- Formerly RFC Power; manganese flow chemistry
- India MWh-class grid demo + UK R&D expansion planned
Funding history (newest first)
Series A
2026-08 £10M- British Business Bank (lead)
- Centrica (participant)
- Ceres Power Holdings (participant)
- Temasek Trust C3H (participant)
Competitive landscape
Edge: Earth-abundant manganese chemistry with duration scaled by tanks; company cites ~20-year life and >75% round-trip efficiency.
Series A is commercialization capital; grid-connected India demo is the near-term credibility gate versus Form Energy’s manufacturing mega-rounds.
-
Form Energy adjacent
Iron-air LDES at much larger U.S. manufacturing scale.
-
Vanadium flow incumbents direct
Proven flow architecture; different electrolyte economics.
-
Lithium-ion short-duration storage alternative
Wrong duration class for multi-day gaps.
Industries
Related funding articles
Venture Capital Tracker pieces that cover Certain Energy's financing or category context.
FAQs about Certain Energy
Practical answers founders, operators, and investors typically search for.
Last updated:
Editorial note: AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.