Installed a 12kw solar system for my aunt. Her bill dropped $500 a month to almost $30 bucks. Only cost 18k for the system. Solar is getting cheap and everyone should be doing it. Now Teslas installs it even cheaper! Its a no brainerSolar is never a "non-starter," it's just that some locals are going to have a longer payback period than others intrinsically. I live in Colorado as well, with rates at about 0.11/Kwh. I invested in a solar system six years ago when the payback was about 11 years. Solar prices have dropped so much that a current payback would be more like six years now.
If you are building new, it is a no brainer to install a solar system at the time of build (especially in sunny Colorado). But any system is worth it if you are committed to the residence for the foreseeable future. Even without the commitment, a solar system almost always repays itself at the time of sale. Not to mention the repayment of knowing your electricity is clean and not coming from a coal-fired plant where 50% of Colorado's electricity is produced.
And as for free supercharging...I have it, and I am hesitant to ever get rid of my 2016 S. It's more a psychological impact than financial. However, I still dream of this car carrying me around the country during retirement for "free" (whenever that actually happens).