The nearest expiration date for ISO New England North East Massachusetts Zone 5 MW Peak Calendar-Month Day-Ahead LMP Futures (Feb 2016) is Jan 29, 2016.
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 ISO New England North East Massachusetts Zone 5 MW Peak Calendar-Month Day-Ahead LMP Futures (Feb 2016) before Jan 29, 2016.