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.
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.
Grid capacity mapping platform for solar and storage developers pre-computing interconnection availability; $66M raised serving AES and Invenergy with 500+ GW analyzed across MISO, ERCOT, PJM markets.
Nira Energy is a Denver-based renewable energy software company providing grid capacity mapping and interconnection analysis tools that help solar, battery storage, and data center developers identify optimal project sites based on available grid capacity — reducing the years-long interconnection study process to minutes by pre-computing capacity availability across major US electricity markets. Backed by Y Combinator with $66 million raised, Nira generated $3.6 million in revenue in 2024, serving 100+ leading energy developers including AES, Invenergy, and Scout Energy with 500+ gigawatts of interconnection studies processed.
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