ERII

Energy Recovery, Inc.

A maker of pressure-exchanger devices that help desalination plants and wastewater facilities cut the energy they use. Its signature PX Pressure Exchanger recovers energy from the high-pressure reject stream in seawater reverse osmosis, reducing power use, and its parts are made of durable alumina ceramic. Founded in 1992 by Leif and Marissa Hauge and named for its core job — recovering energy from fluid flows — the company shipped its first PX device in 1997 to the Canary Islands, and it also applies the same tech to CO2 refrigeration.