I’ve heard theories from pretty smart people that we will approach nearly free electricity as more and more solar power is generated and more and more batteries back up the excess power.

Oddly enough, they left the copper plumbing untouched.The second time there was a camera/alarm system with a battery backup. 

Not sure what battery life is like at -30*C.

Just pay attention to the battery power so they dont die

Replacing batteries in smoke alarms, filters on furnaces...yes tenants should do those as they are easy. 

This post is a year old, so we don't know what happened...but the downsides to solar are a) it is bloody expensive, the payback is far down the road. b) to get a monthly payment like that, I doubt he was going to own the equipment, probably a lease, another huge no-no. c) production of the panels is a green disaster, disposal of them is worse,  d) most panels are made in China in slave labor sweatshops. e) solar by itself is not great, you need a battery backup to really maximize the concept, some localities don't allow them due to possible back-feeds.I've installed solar on a place I own and it is a nice thing to have...if you get everything at wholesale and install it yourself.

CoStar is also tracking more than 20 large electric vehicle, battery, and semiconductor plants planning to open across the U.S. during 2024-26, and suppliers to these facilities will likely generate millions of square feet of additional leasing over that period.Here are several graphs illustrating the current national commercial industrial market in The United States of America:Here is the full USA industrial market report for you to review: https://d2saw6je89goi1.cloudfront.net/uploads/digital_asset/file/1170835/United_States-Industrial-National-2023-10-02_compressed.pdf Data includes: Sale price per unit distribution, cap rate distribution, cumulative sales volume by year, months to sale, recent significant sales, vacancy rates, market rent per square foot, construction deliveries/demolitions, economy, job growth. population growth, and Los Angeles county sub-market activity.

. $ for changing a light bulb (seriously I had this issue), $ for setting off a false alarm, taking the battery out of smoke or CO2 detector, etc.

Keep spare batteries readily avail for your door locks, remote controls etc.25.

It alerts you when battery is low and you can set it on battery saving mode from your phone.