I believe it was $13k, which included digging/backfilling the 2k feet of lines...and as I said above, the extra zones option was gonna be $3k...but we shoulda done it. Check with your electric company, as they almost always (around here anyways) give a rebate if you go with geothermal...ours stopped a couple months prior to us buying our system, because they started on a new power plant and they had to finance it!
We have a seperate meter on our geo unit...I should check it and see how many kw we've used in a little under a year...