Fourth Power vs KoBold Metals
Side-by-side comparison of AI visibility scores, market position, and capabilities
Raised $45M total including $20M Series A (Munich Re Ventures, DCVC, Breakthrough Energy). Integrated demo unit completing 2026. Targets 10x cheaper storage than lithium-ion.
About
Fourth Power is an MIT-originated thermal energy storage company that stores electricity as heat in graphite blocks at 2,400°C — using molten tin as a heat transfer medium and converting stored heat back to electricity via thermophotovoltaics (TPV). The company has raised $45 million including a $20 million Series A from Munich Re Ventures, DCVC, and Breakthrough Energy Ventures, and is completing its full integrated demonstration unit in 2026.
AI mineral exploration startup raised $537M Series C at $2.96B valuation in Jan 2025; discovered major Zambian copper deposit; 60 projects across 4 continents
About
KoBold Metals was founded in 2018 with a mission to accelerate the discovery of critical minerals needed for the clean energy transition — copper, cobalt, nickel, and lithium — using AI to find deposits that conventional exploration methods have missed. The company applies machine learning to vast and heterogeneous geological datasets, including historical drill records, geophysical surveys, satellite imagery, and geochemical data, to build predictive models that identify where high-grade deposits are most likely to occur. KoBold's scientific approach was shaped by its research collaboration with prominent academic geoscientists and has been validated by discoveries in the field.\n\nKoBold operates across more than 60 exploration projects spanning four continents, including active programs in Zambia, Australia, Canada, and the United States. Its most significant milestone to date is the discovery of a major copper deposit in Zambia — one of the largest new copper discoveries in decades — which drew global attention to the company's model-driven approach. KoBold partners with major mining companies and sovereign wealth funds, providing both exploration intelligence and co-investment structures that reduce risk for capital partners while enabling KoBold to advance a diversified project portfolio.\n\nKoBold Metals raised a $537 million Series C at a $2.96 billion valuation in January 2025, backed by investors including Bill Gates, Jeff Bezos, and institutional mining capital. The round reflects both the quality of its asset portfolio and investor conviction that AI-driven mineral exploration will be a structural advantage in a market where conventional exploration productivity has declined for decades. As the energy transition creates sustained demand for battery and grid materials, KoBold's ability to discover more deposits faster positions it as critical supply-side infrastructure for decarbonization.
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