HOUSTON (AP) — Waste Management is selling a subsidiary to Energy Capital Partners for $1.94 billion as part of its effort to focus on its core business. It is selling Wheelabrator Technologies Inc., which owns or runs 17 waste-to-energy facilities and four independent power-producing plants in the U.S. The business also has four ash monofill landfills, three transfer stations and an ongoing development and construction project in the U.K.