Well, last February I was chatting with a salesman from a local solar power company, mainly because a friend is literally building his own system, and I realised that with a little extra outlay I could have my own installed for me. So we did it!
So we arranged a deal with one of the local credit unions to loan me the money to buy the hardware and get it all installed, and the installers negotiated with Tacoma Power (the electricity provider) so that they would install a "net" meter (instead of a "one-way" meter that just measures what you're consuming), so that they could treat me as a supplier or a consumer. The installers arrived one rainy March day (poor guys !) and did the whole thing in about 5 hours - installed a framework onto the roof, installed the wiring for the panels down to the metering, and installed the panels themselves - all 32 of them (14 here and 18 on the other side - 32 in all)
So, the roof is producing (during the summer months) far more than I consume, so during the day I produce power and that's accepted by the Tacoma Power system and used to help supply other people on the electricity grid. During the night the roof is producing nothing, so I consume directly off the grid, just like everyone else. I could, I suppose, install a set of batteries to charge during the day and supply me during the night, but, aside from being costly, there's already no room in the basement !!
Today (2020.10.11) is a very rainy day, and my roof isn't seeing enough photons to be worth waking up for! So we're consuming as before, directly off the grid. Overall we were consuming between 600 kWhr and 800 kWhr ("kiloWatt-hours") every two-month billing period. That's dropped considerable over the last few months, but will go back up over the winter. However, Here in Tacoma the one major utility company supplies drinking water and electricity and also handles sewerage and run-off water, so from now on whatever I produce is set againat the aggregation of all these bills, so it isn't all that easy to see just what the benefit is without comparing things back to last year, but I have to say that things definitely are less expensive !