Most of these questions I've answered in further detail earlier in the thread, but I'm happy to summarize.

Cost: right around $8,500, which will net out to $4,000 after tax incentives.

Should take my average bill from $120 to $9.06 which is all connection fees. $1,330 per year in savings, 3 year pay back.

I'm in Orem, on Rocky Mountain Power.