Bloom Energy Corp. /zigman2/quotes/209802424/composite BE +3.91% shares rose nearly 30% on Wednesday after the alternative-energy company said it is making inroads into the commercial hydrogen-fuel market. Bloom said it is making hydrogen-powered fuel cells and electrolyzers that produce renewable hydrogen, with the first cells expected to be sold in South Korea next year through a partnership with an affiliate of Korean conglomerate SK Group. "This expansion of our product offering enables zero-carbon electricity and transportation solutions," Bloom's founder and Chief Executive KR Sridhar said in a statement. "Innovation and execution are fundamental tenets of our business and we are excited about the opportunity to advance the hydrogen economy with our long-time partner, SK E&C." Bloom Energy makes solid oxide fuel cells that are used in stationary power-generation servers placed at client locations. Bloom stock has gained 135% this year, contrasting with losses around 0.5% and 6% for the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.27% and the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA +1.30% .