In a grid connected rooftop solar power plant, the DC power generated from solar panels is converted to AC power using an inverter and is fed to the grid either via 33 kV/11kV three phase lines or via 440/220 Volt three/single phase line depending on the capacity of the system installed at institution/commercial establishment or residential complex and the regulatory framework specified for respective states.

These solar plants generate power during the day time which is utilized fully by powering captive loads and feed excess power to the grid as long as grid is available. In case, where solar power is not sufficient due to cloud cover etc., the captive loads are served by drawing power from the grid.
 
The prices quoted are for monocryastalline solar panels having an efficiency greater than 20.3 %.
 
Subsidy Pattern for grid connected solar power plants in India:
 
Central Govt.
Plant Capacity
Applicable Subsidy (As per MNRE Notification)
Up to 3KW
INR 17,662/- per KW
Above 3KW and up to 10KW
INR 17,662/- per KW up to first 3KW and thereafter INR 8,831/- per KW
RWA/Group Housing 10-500 KW
Rs.1,14,803 Fixed.
 
Extra subsidy available in Uttarakhabd state only:
 
Uttarakhand State Govt.
Plant Capacity 3KW onwards
Rs.51,000/-
 
Note: Customer needs to pay the full amount for the solar power plant. Subsidy will be  transferred by MNRE (Ministry of New and Renewable Energy) to Customer A/C by DBT (Direct Benefits Transfer Scheme) Scheme of Central Govt. of India.