** Shares of Frontier Energy FHE.AX rise as much as 16.7% to A$0.140, set for biggest one-day pct gain since March 4

** Renewable energy co says Western Australia's Economic Regulatory Authority increases benchmark reserve capacity price (BRCP) for the 2027/28 capacity year by 54%

** Higher BRCP to have positive impact on the economics of Waroona Renewable Energy Project, co says

** Stock trims YTD losses to 63%, as of 0340 GMT

(Reporting by Namrata Verma in Bengaluru)

((Namrata.Verma@thomsonreuters.com;))