Idemitsu Kosan — 2026 Investments
2 investments dated 2026 · listed companies and verified rows first · show all
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 TechEnergy
Carlos Araque(Founder)in
Co-investorsHelium-3 VenturesThe Engine VenturesJERAPrelude VenturesSafar Partners
Quaise Energy develops superhot geothermal drilling technology using millimeter-wave powered drilling to access deep geothermal energy sources at unprecedented depths and temperatures for large-scale clean power generation globally.
CleantechDeep TechEnergyHouston, US
Carlos Araque(Executive Officer, Director)inMatt Houde(Founder)in
BoardColleen Calhoun(Director)inVinod Khosla(Director)William Restrepo(Director)Frohman Anderson(Director)
Co-investorsCollaborative FundFine Structures VenturesHelium-3 VenturesPrelude VenturesTechEnergy VenturesXplorer Capital+5 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.