Let’s think about this.
Vehicle to Grid (gasoline powered generator running at night)
Gasoline — $27 per million Btu.
I supply the capital to provide the “power plant” (i.e., the car)
Thermal efficiency — 40%?
Maintenance — $75 - 100/hour at your car dealer
Natural Gas Fired Combined Cycle Central Plant
Natural Gas — $8 per million Btu.
The utility supplies the capital to provide the power plant
Thermal efficiency — 60%
Maintenance — Supplied by utility company. $50/h?
Looks DOA to me.
Maybe, some long time in the future, the vehicle could be a source of power (fuel cell?) but what the article proposes is using vehicles as storage.