MENLO PARK, Calif. — In an important breakthrough towards a resilient, zero-carbon electric grid, Mainspring Energy today announced that its Mainspring Linear Generator has passed key tests directly running 100% hydrogen and 100% ammonia fuels at high efficiencies. It is the first power generation technology to provide this level of fuel flexibility within a single product, significantly reducing customer investment risk in delivering resilient, clean, dispatchable, and low-cost electricity for both power grids and commercial and industrial uses.