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The Hamakua Energy Partners. LP (HEP) power plant employs the latest in emissions control technology. HEP begins with using only clean low sulfur content diesel and extremely low sulfur naphtha fuels; utilizes water injection in the combustion turbines and anhydrous ammonia injection with Selective Catalytic Reduction in Heat Recovery Steam Generators. Use of the latest emission control technology makes HEP the cleanest fossil-fueled power plant on Hawaii Island.