I pay Griddy, my energy provider $10/month to buy energy at cost via the ERCOT regulated energy system in Texas. We had 3 days a short time ago, that every kWh, for relatively short periods, cost around $13 - including the "ancillary" add on that ERCOT legally receives (yes, $13 - not a typo). I was able to minimize my costs by precooling the entire home late at night/early morning (about 1.5 cents/kWH) to about 70 degrees and then letting it float up to 79 degrees during the "peak" of the ERCOT systems power levels. It was still costly, but not nearly as most others that use such a contract. I'd doubt that this minimized the overall energy consumption, but certainly helps the overall operation of the ERCOT grid (and my wallet). I have saved 20-30% on the first year with Griddy compared to any other contract at the time I had to decide.
Eventually, as more users realize that maximizing late night/early morning usage actually helps the "grid" and as a result, they are able to save usage during the peak afternoons, that less "peaker" energy (think very expensive) is required - at least here in the ERCOT system which is likely similar to most grid systems.
V2X along with EV proliferation (talking millions) has the "potential" to actually help stabilize the grid - however is quite a ways off for many reasons. If I knew anything about twitter - #microgridforhomes