Centerpoint, the physical electricity provider in Houston, has said it would cost $2.5M per square mile. Houston is 640 square miles. Regulations allow them to claw back costs on the bills. (For example, repairs from past storms are often paid for over the course of several years in the form of a bond that is applied to customers as surcharges)
https://www.houstonchronicle.com/business/energy/article/cen...