WASHINGTON — Although the Environmental Protection Agency recently relaxed an upcoming power-plant emissions rule, it still threatens the reliability of Texas’ electric power grid, most of the state’s U.S. House delegation contended Wednesday.

Some power plant operators have warned they will have to shut down generators to meet the standards of the Cross-State Air Pollution Rule that, starting in January, will require plants in 27 states to shrink emissions of soot- and smog-forming chemicals that can blow across state lines. The deadline for compliance is in 2013.

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