May 9, 2012. State-run Power Grid Corporation (PGCIL) said damaged towers of transmission lines that carry electricity to the North East (NE) region would be restored. Towers had collapsed at two locations near Alipurdwar in West Bengal on 400 kV Binnaguri-Bongaigaon circuits due to heavy storm and inclement weather conditions, Power Grid said. This line connect NER (North Eastern Regional) and ER (Eastern Regional) grids. The NER grid continued to be connected with the ER grid by two numbers of 220 kV circuits between Birpara (WB) - Salakati (Assam). Power Grid is engaged in power transmission business with the mandate for planning, co-ordination, supervision and control over complete inter-state transmission system.