What Makes Developing Electric Transmission So Hard?

Electric transmission has once again taken center stage, as the energy industry grapples with how best to meet the clean energy goals of states, cities, utilities, and private corporations. New high-voltage transmission will be critical to integrating large-scale renewable resources, balancing the grid over greater distances, and accommodating the additional load anticipated due to electrification. Some estimates suggest that transmission capacity may need to double or triple to facilitate the clean energy transition.
Developing transmission is difficult for a variety of reasons, and this paper from ScottMadden speaks specifically to challenges related to transmission planning, cost allocation, interconnection queues, ratemaking and incentives, and siting and permitting.