During the last few years, the unreliable grid power in the country has prompted large industrial consumers to invest in captive facilities. Most of these consumers have 60 80 per cent of the grid power as back up, even though the cost of captive power is 1.25 to 2 times that of the grid power. The captive power capacity in the country is about 32,000 MW ending March 2009, almost 20 per cent of the total power grid capacity. The information technology sector is not taking any chance. Most of them have installed diesel generating sets and UPS machines to take care of sudden disruption in supply. Domestic and commercial consumers have also installed portable generating sets and/or UPS systems and inverters. Inverters charge batteries during the non-peak period and help in shaving load during the peak period (during power cuts The reliability of consumer supply has increased with the added cost lil