It doesn't seem unreasonable to me if it's a demand response generator (peaker)... If demand is low, charge batteries. If demand is high, drain batteries. If d

It doesn't seem unreasonable to me if it's a demand response generator (peaker)... If demand is low, charge batteries. If demand is high, drain batteries. If demand is higher than batteries can sustain, run gas. If there's a subsidy for putting battery electric power on the grid, when batteries are low and demand is also low, run gas to charge batteries locally and then supply that to the grid later to get the subsidy. Only the last part requires colocation, but it's probably easier to get one power plant parcel zoned and one power plant hooked up to the grid, and having both energy storage and a gas peaker together might bring it up the connection prioritization list because it addresses multiple problems for grid operation.