54 GH/s @ $12/btc (after halving) = $106/day
54 GH at difficulty 19970091.25813 is 1.36 BTC/day after the halving. $16.32/day at $12.
I suspect your calculator is in need of repair.
Your power figure is 22% of the income and thats a "soon" rate, e.g. the rate after the hardware which is already ordered and paid for is turned on. And what happens when the difficulty has cranked to 100x on second gen mining asics?
Ah, yes, I had the difficulty unadjusted.
$16.32/day income, $3.6/day electricity. 22% is a far extreme estimate.
bASIC isn't going to run 500 watts. Extremeley few miners run at $.30/kwh. The normal case will be far better, more like 5% spent on electricity. Insignificant.
What's going to matter is time to start and cost to start. Not power costs.