How a Utility Actually Sets the Price of Electricity

Utilities in the US have a couple big jobs to do. On the one hand, they need to deliver affordable and reliable power to their customers. On the other hand, they also need to maintain and upgrade huge amounts of fixed infrastructure. Balancing those two jobs is getting more complicated thanks to America's aging electricity grid and the shift towards renewables. So how are big utilities squaring those two objectives? How do they decide how much money they need to fund new capital investment? How