Because of the enormous scale of its projects, the segment sees system prices that are nearly $2 per watt cheaper than the residential segment. Turnkey installation prices for fixed-tilt PV systems fell from an average of $1.77 per watt in the first quarter of 2014 to $1.55 per watt in the fourth quarter.The report notes significant variance in system pricing in the utility-scale segment, ranging from as high as $2.10 per watt or as low as $1.40 per watt.owever, system prices continued to fall, despite the lack of installation growth. Driven by significant reductions in balance-of-system costs, the cost for a medium-scale commercial system averaged $2.25 per watt by the end of 2014. This is down from $2.53 per watt in the first quarter of 2014.