If you want to take advantage of night rate electricity, then yes. With night rate, you have two meters, one that monitors usage during the day, the other usage at night. There is an installation fee and an additional recurring charge to put this in place. All the details are on the EBS's site. BG's site may cover it also, but I haven't looked there.
You'd need to be sure you use enough electricity at night to justify the installation and ongoing costs.
Leo