The nearest expiration date for ERCOT West 345 kV Hub 5 MW Peak Futures (Jan 2017) is Dec 31, 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 ERCOT West 345 kV Hub 5 MW Peak Futures (Jan 2017) before Dec 31, 2016.