It hasn’t made big news yet outside of specialty publications such as Bond Buyer.

But a call this week by New York City Comptroller William C. Thompson could cast a new cloud over a half-dozen or more planned new coal-fired electric power plants.

Thompson called on the U.S. Treasury Department to investigate the practice of using tax-free bonds to finance new coal plants.

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In the letter, online at www.comptroller.nyc.gov, Thompson pointed to recent research which found that coal plants were poor candidates for federal financing and problematic for investors.

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There are at least a half-dozen planned new power plants that would rely on tax-exempt bonds.

The Treasury Department has announced it would take a hard look at use of such bonds for sports arenas. You’d think they ought to take an even harder look at old-fashioned coal plants.