The nearest expiration date for PJM AEP Dayton Hub 5MW Peak Calendar-Month Real-Time LMP Futures (Nov 2015) is Dec 2, 2015.
The best time to sell a futures contract is when you've already made money on the investment, but still have plenty of time left before the expiration date. Thus, a good option would be to sell PJM AEP Dayton Hub 5MW Peak Calendar-Month Real-Time LMP Futures (Nov 2015) before Dec 2, 2015.