Here's a back of the envelope calculation. The per capita energy consumption in the US is about 12,000 KwH/Yr: see

List of countries by electricity consumption - Wikipedia, the free encyclopedia
The population of Pittsburgh is about 340,000, so the total electricity consumption per year in Pittsburgh can be guestimated to be around 4,000,000 megawatt-hours/year, or an average electricity power draw of 466 megawatts. I suspect the energy saved by recycling 1 ton of paper is a pittance compared to that!