A traditional power plant sells energy. A virtual power plant sells flexibility. It is hundreds of batteries in hundreds of buildings, coordinated by software, that the utility can ask to discharge at the same moment — which does the same job as firing up a gas peaker plant, at a fraction of the cost.
The utility pays for that flexibility in one of two ways: a capacity payment for keeping the battery available (paid whether or not it is called), and an event payment when it is. Programs vary by state and utility, and they change quarterly, which is why we do not print rates here. What we do is match your building to the programs it qualifies for and model what they are worth.
Your operation is not affected. The battery is sized so that grid events and your own peak-shaving do not compete, and you keep backup reserve for outages if you want it.