the past 6 months. We have 30 panels on our south facing roof and generate a ton of electricity.
The furnace is gas but even that hasn't been too bad - the highest bill we've had all winter was $235 while others in the area have been having bills over $800. The panels were already installed and we took over the lease. It's with Tesla unfortunately but the payments are less than $100/month.
There's 10 years left on the lease, once it's up we'll probably replace the roof and get new panels on. I'm guessing by then they'll generate even more electricity.