FromGEOTHERMAL BRINE TO BATTERY

Lithium is central to battery storage and the energy transition, and geothermal brine offers a route to it that does not depend on hard-rock mining or evaporation ponds. This Geologic® case review examines that route in California's Salton Sea region, known as Lithium Valley, where geothermal plants already bring lithium-rich brine to the surface for power, creating a potential co-production opportunity. It weighs the extraction technologies against the environmental and social responsibilities that come with them, a question that matters as Saudi Arabia's national strategy prioritises lithium exploration and downstream processing.

Average lithium in Salton Sea post-flash brine is estimated at about 200 mg/L. The conventional routes carry heavy costs: hard-rock mining disturbs land and leaves waste rock, while evaporation needs large ponds, takes 18 to 24 months, depends on the weather and consumes much water. Four families of direct lithium extraction, ion-exchange adsorbents, organic sorbents, solvent extraction and membrane separation, offer alternatives, and removing corrosive minerals can also benefit plant operations. Water use, air emissions and toxic dust, and a fair share of benefits for historically disadvantaged communities are the issues the case sets beside the technology.