The administrative stay is expected to provide more time to consider an alternative between the EPA’s plans and the New Mexico Environment Department.

However, this stay does not extend the September 2016 compliance date of the federal implementation plan, which includes a requirement to install selective catalytic reduction (SCR) technology on all four units at the coal-fired power plant.

The firm said it was finalizing an agreement with an engineering, procurement and construction (EPC) contractor to install the SCR units.

PNM Resources chairman, president and CEO Pat Collawn remarked that the EPA is interested in considering the recently proposed state alternative.

"We have supported efforts over the past 90 days to explore alternatives that could provide environmental benefits, while also reducing costs for customers. We think the state alternative offers a potential way forward to achieving this goal," Collawn added.