Electricity glitch

Today I faced a problem when I just started to build a new city. Suddenly red power symbols, tap symbols started appearing even though the supply or the capacity was almost double the demand. It has reduced my city's population by 50 percent and the happiness index went from 100 to 55. Idk if it is a glitch or something else. 

IF ANYONE KNOWS HOW TO FIX IT PLEASE TELL ME🙏🏻😭😭😭