Recently Delhi Government announced the subsidised electricity to the consumers having up to 400 kWh per month electricity consumption. However these subsidy scheme can control the electricity prices and give a temporary relief to the consumers, it is not the sustainable long term solution
Instead of providing subsidies to the DIscoms, the Government can adopt solar power through its much awaited rooftop solar program and can provide subsidy to the rooftop solar PV owners, which will give relief to the constrained grid and the electricity will be available at a cheaper rate. The recent cost slide down in rooftop PV systems have made it viable proposition and the rooftops can be turned in to power stations, which will not only provide the electricity to the consumers at par with the grid electricity but also the rooftop owners can also earn additional revenue through feeding their surplus electricity in to the gird.
As per the estimates of MNRE there are 140 million houses with proper roof (Concrete or Asbestos / metal sheet) which can accommodate about 1-3 kWp of solar PV system. Similarly the large industrial rooftops can accommodate larger capacities in the range of 100-500 kWp. Hence MNRE estimates that there is a potential of about 25000 MW rooftop solar PV capacity that can be accommodated on roofs of buildings having 2 rooms alone if we consider 20% roofs. If the add the potential of commercial and industrial rooftops, this potential can further go up.
A typical house having a roof area of about 300 Sq ft (3 KW) can generate about 15 kWh of electricity on daily basis and can meet the typical house hold electricity monthly requirements of about 400 units per month. This system shall cost about 2.5 Lac, and if the Government provides a subsidy of 30% to these households the net cost of the system to the house holds shall be about 1.5 Lac, this way the payback period to the households for their investments is about four-five year period. In fact it can be a business opportunity to generate additional revenue to the home owners through feeding the surplus electricity in to the grid. In this way, while Delhi Government is providing about 60 Cr. per month as subsidy to the home owners as a part of their electricity bills, this amount can provide the installation subsidy support of about 30 MW of rooftop solar PV on monthly basis to the home owners. We believe the Kejriwal Government will consider the rooftop solar as a subsidy option rather than the subsidised electricity tariffs.
As Bill Gates predicted that every household would have a computer, Rajiv Gandhi brought the mobile phone to every Indians, we believe that falling PV prices will bring rooftop solar PV to grid parity and every house hold in India will have its own sustainable generation source of electricity which is much more affordable and a long term electricity solution.