Crain’s New York Business: The New York Power Authority on Wednesday nixed plans for a “clean coal” facility at its Huntley plant in western New York, casting doubt on the financial viability of clean coal technology. NYPA officials say the electricity produced by the Huntley plant, in Tonawanda, N.Y., would be too expensive, requiring some $150 million a year in subsidies to compete with more conventional sources of generation. In a letter to New Jersey-based NRG Energy, which owns the Huntley plant, NYPA …