City of Petacalco Petacalco has a major thermal electric generating plant. You can't miss the three huge smokestacks. There is a turnoff to the west in the centre of Petacalco for a beach area. NOTE: The highway between Petacalco and La Mira has lots of topes. La Mira to Petatlan From the junction of Highway 37&200 at La Mira in Michoacan to Petatlan in Guerreo.