The nearest expiration date for PJM PPL Zone Peak Calendar-Month Day-Ahead LMP Futures (Jan 2015) is Jan 30, 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 PPL Zone Peak Calendar-Month Day-Ahead LMP Futures (Jan 2015) before Jan 30, 2015.