Electricity price regulation, at least for transmission, has been a thing for states for 100+ years and federally since the 1930s. Pipelines and railroads also have price regulation of some sort.

Monopolies, in these cases natural monopolies, can in fact exist. Look at the Micro supply and demand curves. As a general rule over those 100 years, there has not been rationing of electricity. There are natural blackouts and today an unplanned surge in demand (as happens in every industry such as chips after Covid), but generally the price regulation did not cause some kind of gas lines.