I mine with solar energy. Works well for me. Lifecycle cost should be around 4.5cents per kwh where I live.
When you say you mine with it how many watts are you getting from solar?
If you don't mind me asking what did it cost for install, and what is your normal electricity price?
I have 20,000 watts (20kw) of solar power online currently. I'm bringing another 20kw online in the next 2 months (already installed the panels just need to hook up the inverters) and another 60kw over the next 12 months. My cost per kw installed is about $1.5/watt for grid connected solar system after all the state and federal incentives. Cost of electricity in my area is about 16cents/kwh