In PA, you are allowed to contract with any electric power provider who can deliver over PECO lines. There is a website that features all of the available deals, fixed or floating rates. You can choose X% renewable if you want to, etc.
I usually go with an annual fixed rate contract. I am currently paying $0.063 per kWh. Best offer for next year is $.0905 per kWh. That's a 44% increase...in the fracking capital of the USA. We have access to the cheapest Natural Gas available for electric generation. People are going to go ape when this starts to become apparent. Of course, the same thing is true for heating via NatGas, Propane, and Heating Oil as well.