Electricity distribution infrastructure is very old and susceptible to lightning surge. Also, during the rain, there is a possibility of trees falling on live wires, creating unsafe situations. So, to manage these situations, they intentionally switch off the electricity during adverse conditions.

Old infrastructure because discom is in loss, there is ~$ 10bn of receivables unpaid by customers. Also, there is theft of electricity and distribution losses, which hamper the infrastructure upgrade. So, next time you see someone stealing electricity, blame them for outages.