Ald. Byron Sigcho-Lopez says he’ll attempt to block a demolition permit for a former coal plant in Pilsen until more details are released about potential environmental impact and the building owner reveals the long-term plan for the site.

NRG Energy has asked the city for permission to destroy 13 structures around the idled Fisk coal-fired power plant which provided electricity for more than a century until it closed in 2012.

Sigcho-Lopez (25th) said Monday that he wants NRG to tell the community what it plans to do with the plant, which is located at 1111 W. Cermak Road along the South Branch of the Chicago River. The main building, the largest structure, is not part of the recently announced demolition plan.

“Before they even start, we’re asking to hold the permits immediately so we k

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