New Delhi: Prime Minister Narendra Modi 's appeal for a 9-minute blackout at 9 p.m. on Sunday, has shaken the babus in the power ministry who have put themselves in a huddle to quickly devise a strategy to prevent the April 5 event from creating ground for a possible grid collapse and resultant blackout throughout the country.The Grid stability in the country is maintained by keeping power frequency within a range specified by Central Electricity Regulatory Authority (CERC). Any deviation from identified frequency is managed by increasing or decreasing power flow in the grid. Sudden drop or increase in frequency causes a collapse.The Prime Minister's call for a blackout urging citizens to light a lamp, candle or shine a mobile flashlight to dispel the darkness spread by the coronavirus , is expected to result in sudden drop in electricity demand across the country and has even the potential to disturb grid frequency creating potential situation for a grid collapse. Union Power Minister has discussed the issue (sudden fall in demand during April 5 blackout) with PGCIL ( PowerGrid ) and Load dispatcher in today's meeting. They are upto the task and are confident of managing the grid stability for the event," said a government spokesperson.Power System Operation Corporation Limited (POSOCO), a wholly owned Government of India Enterprise , an entrusted with the task of ensuring the integrated operation of the Grid in a reliable, efficient, and secure manner, has also been sounded off to plan scheduling of power with all the five Regional Load Despatch Centres and National Load Despatch Centre (NLDC) so that grid frequency is maintained even if demand drops suddenly during the blackout.Sources said that state government have also been told to be ready to manage the power scheduling if a need arise and keep some of their generating units in ready mode to switch off few units of grid frequency dropped suddenly. Central utilities like NTPC may also be keep in a state of readiness to switch off some of their gas based stations are easy to switch on and off as per grid requirements.An official of PowerGrid Corporation , which operates the national grid of transmission network, said that though the situation calls for notice, it is not alarming and the grid operators are well prepared to handle sudden drop in power demand."Actually considering the need of pan India lockdown due to COVID-19 pandemic, Peak Demand in the country is already lower by about 20 per cent. So, the national and regional load dispatch centres are already grappling with low demand a further drop on April 5, should not be a problem that can't be handled with ease," the official said.As per power ministry data, on April 2, 2020, the maximum power demand met in the country stood at 1,25,817 ME, almost 20 per cent lower than April 2, 2019 figure of 1,68,326 MW.India's grid is connected as a wide area synchronous grid nominally running at 50 Hz. The permissible range of the frequency band is 49.95-50.05 Hz, as per CERC. The Union Government regulates grid frequency through national and regional load dispatch centres. States regulate intra-grids through State Load Despatch Center (SLDC).Two severe power blackouts affected most of northern and eastern India on 30 and 31 July 2012. The 30 July 2012 blackout affected over 400 million people while July 31 blackout affected 620 million people mainly in Northern India. In 2012, an estimated 27 per cent of energy generated was lost in transmission resulting in grid collapse.