All part of a new business strategy by power companies to encourage EVs, and provide the power for them.There's a new program for ConEd customers called SmartCharge Rewards that tracks your car's charging and gives you points for charging during off-peak hours. The points are redeemable for gift cards (e.g., Amazon). The tracking is done with a device that plugs into the car's OBD port. The device has its own cellular connection to report charging details.
Here is how you earn points (1000 points = $1 in towards gift cards; "C2" is the tracking device):
So, at a minimum, you get a 5 cents/kWh discount on charging during off-peak (midnight - 8 am) hours.
This is pretty neat, although I wish they just paid customers in cash or ConEd bill credits, rather than futzing with gift cards.
Also, there's a generous $20 bonus for not charging during summer peak hours (2 pm - 6 pm), but the Volt likes to draw a little charge now and then to maintain temperature or whatever, which I don't think you can prevent except by keeping it unplugged during those hours. That's kind of annoying. (I guess one could prevent it by using a smart charging station that forbids any current draw between those hours - but I just use the charger that came with the Volt.)
They don't do bill credits because it's cheaper to give gift cards. The cost of those is subsidized by the merchant.