(Reuters) – Small changes made to a federal smog pollution rule last week have not allayed fears of Texas regulators who worry the new rule could lead to increased rolling blackouts, Donna Nelson, chairman of the Texas Public Utility Commission said on Thursday.

Texas is among 15 states challenging a January deadline for implementation of the Environmental Protection Agency’s Cross State Air Pollution Rule (CSAPR) which sets stricter limits on sulfur dioxide (SO2) and nitrogen oxide emissions from power plants in order to protect the health of residents in states downwind from the emissions.

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