The Startup Index
Companies across the energy transition worth tracking. Featured entries link to a full write-up; watchlist entries link out to the company itself.
Sector
Status
FiberSense
Fiber-optic sensing for subsea cable and grid infrastructure, detecting threats in real time.
Repath
Physical climate risk analytics that turn the threat of extreme weather into a number investors can act on.
Energy Dome
CO2 battery technology for long-duration, grid-scale energy storage.
Nyobolt
Ultra-fast-charging EV battery technology, cutting charge times without sacrificing battery lifespan.
Verne
Cryo-compressed hydrogen for clean, always-on backup power, built to replace diesel generators.
Metafuels
Converts green hydrogen and captured CO2 into sustainable aviation fuel, at scale.
Synhelion
Solar-powered synthetic fuel, using concentrated sunlight to drive the fuel-making process itself.
Impossible Metals
Robotic, low-impact seabed collection of the critical minerals batteries and grid infrastructure depend on.
Submer
Liquid cooling for data centers, cutting the energy and water footprint of AI-driven power demand.
Watchlist
Nexeon
Nexeon
Founded
2006
Raised to date
$466.3M
Nexeon is a leading battery materials producer, focusing on advanced silicon-based anode materials capable of dramatically enhancing the performance of lithium-ion batteries. Silicon's ability to hold more lithium ions in a given volume means more energy in less space. Its technology directly targets the two biggest barriers to mainstream EV adoption: limited range and long charging times, with the added promise of smaller, cheaper battery packs as the technology scales.
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