St. Louis Post-Dispatch: On a clear December morning, drivers traveling south on state Route 4 in southwest Illinois can see the Prairie State Energy Campus’ stack rising 700 feet above the surrounding corn fields — 70 feet taller than the Gateway Arch. The scope of project is even more striking once on site. The hulking plant will consume more than 50,000 tons of structural steel, 15,000 tons of steel rebar and 160,000 cubic yards of concrete. It is surrounded by more than a dozen tower cranes, their jibs …