I've been doing some reading up on the full cycle carbon footprint of energy production and consumption, and realising there's a lot of aspects that are frequently overlooked. One of these I'm wondering about are power lines. Over the lifetime of the power lines, including maintenance (and possibly management), what is the carbon production per kWh?
Solar parabolic array vs PV panels
The inspiration of the question is that solar parabolic arrays are reported to be substantially more efficient than PV panels, but given that PV panels don't need power lines if they're on your roof, I'm wondering if the carbon footprint of power lines make up the difference.