You're local to me.There's a couple ways to go at this ;If you're looking to save some money you can have your plumber install sub-meters after the individual meters.

Anything beyond that is going to take some blocking and tackling (reaching out directly to local companies like solar farms, construction, medical staffing agencies, etc.).

There has never been any sort of lease signed nor has she ever paid anything more than a few electric bills which are next to nothing since he has solar. 

The electrician got the 4 gang meter pan installed and went through all the fuses and whatnot to divvy out and installed separate panels for each unit.

The City could also require solar power.

One more thing I should address:  Installing cameras inside of a residence with other tenants can be a HUGE legal violation.  

"Time to install lights?

., equipment) are excluded from 1031 treatment and are taxed separately—goodwill is typically taxed as a capital gain, while equipment may be subject to depreciation recapture taxed as ordinary income.To minimize taxes on the sale of the business, consider strategies such as Opportunity Zone investments, which defer gains until 2026 if proceeds are reinvested in a Qualified Opportunity Fund (QOF), or structuring the sale as an installment agreement to spread taxable income over multiple years.

The property is off grid, but already set up with solar and a compost toilet and things of that nature.

Rip all the ceilings out, install furring strips and drywall.