Idemitsu Kosan — 2026 Investments

1 investments dated 2026 · listed companies and verified rows first · show all

Quaise Energyquaise.com inAug 2026 · $180M

Quaise Energy develops ultra-deep geothermal drilling using gyrotron-powered millimeter-wave technology to reach depths up to 20 km and temperatures up to 500°C, aiming to build superhot geothermal power plants.

CleantechDeep TechEnergyHouston, US

Matt Houde(Founder)inCarlos Araque(Founder)inAaron Mandell(Founder)inPaul Woskov(Founder)

BoardColleen Calhoun(Director)inVinod Khosla(Director)

Co-investorsCollaborative Fund Fine Structures Ventures Helium-3 Ventures JERA Prelude Ventures Standard Investments +7 more

Rows marked “SEC filing” are inferred from directors named on the company's SEC Form D — public regulatory data, not a portfolio list published by the firm.