Pumped Heat is a start-up company established to commercialise a novel ultra-low cost long duration energy storage technology, known as PH₂O. The technology is expected to provide days to weeks of storage at Megawatt (MW) scale.
PHES (Pumped Heat Energy Storage) is the generic term for technologies that store energy by moving heat from a cold store to a hot store, and reverse the process to recover the energy. The PH₂O version of PHES uses un-pressurised water in both hot and cold stores to reduce the cost of storage to the absolute minimum.
The predicted round trip efficiency is in the range of 55%-65%, the thermal stores have already been built at GWh scale for district heating applications and each additional unit of energy stored is approximately 1/30th the cost of batteries.

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