Lucknow: Coal shortage caused by heavy rainfall and waterlogging at mines have affected thermal power generation in Uttar Pradesh, prompting limited night-time rostering in some areas, UPPCL said on Sunday.Rain has disrupted coal production and transportation at mines across the country, reducing stocks at several thermal power plants. Similar problems have affected generation in Punjab, Haryana, Rajasthan, Madhya Pradesh, Maharashtra, Karnataka, Tamil Nadu, Andhra Pradesh and Gujarat, an official said.UPPCL said electricity supply remains normal across the state during daytime. However, during peak evening and night hours, the gap between demand and available power has necessitated limited rostering in rural areas, Bundelkhand, tehsil towns and nagar panchayats.The corporation said only 2-3% of its requirement sought through power exchanges is currently getting cleared during peak hours, limiting its ability to purchase additional electricity. District headquarters, however, are being provided round-the-clock supply.UPPCL said the state has performed strongly in meeting electricity demand in recent months.The corporation said it is coordinating with Coal India Limited and other agencies to improve coal availability.