Your math on the house seems off by a factor of 4? But 30% utilization seems high, as that would be a $2k/mo electric bill at 20 cents/kWh.
Reframing what you're saying, that would be a connection fee that worked out to just under 12 cents per kWh used for the first year, which seems both somewhat reasonable but also probably not going to move the needle much on the large deployments?
I guessed what the utilization factor for a house was, purposely going for a very high number to show that it wouldn't add too much to the house.
Note, In proposing a one time fee, on the capacity to generate power, not the energy.