In a solar rooftop system, the solar panels are installed on the roof of any residential, commercial, institutional and industrial buildings. This can be of two types (i) Solar Rooftop System with storage facility using battery, and (ii) Grid Connected Solar Rooftop System.

• The source of energy is free
• Reduces Electricity Bill
• Lasts a very long time, over 25 years
• Free of cost energy after payback period of plant
• No pollution, renewable source of energy unlike fossil fuel
• Low maintenance

Tata Power-DDL is facilitating their consumers to install online grid connected rooftop solar system by carrying out Technical Feasibility assessment as per DERC Guidelines for Net Metering.

In grid connected rooftop or small SPV system, the DC power generated from SPV panel is converted to AC power using power conditioning unit and is fed to the grid. These systems generate power during the daytime which is utilized fully by powering captive loads and feed excess power to the grid as long as the 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.

As per the DERC guidelines, maximum solar plant capacity should be the Sanctioned Load of the connection. If a consumer wants to install plant beyond this capacity, he/she needs to pay the additional SLD charges as per DERC Guidelines.

About 10 sq.m or 120 sq. ft. area is required to set up 1 kWp grid connected rooftop solar system.

The grid connected rooftop system can work on net metering basis wherein the beneficiary pays to the utility on net meter reading basis only.

The electricity consumption in any time block (e.g., peak hours, off-peak hours, etc.) shall be first compensated with the electricity generation in the similar time blocks in the same billing cycle. For the purpose of carrying forward of surplus or setting off of energy credits, the energy units shall be moderated as per the relevant rebate/surcharge percentage of ToD Tariff.

See how solar energy interacts with the grid and powers your home during the day.

Scenario-1: Morning

Energy Flow

• Solar plant will start generating power
• Your energy demand will be first met by solar power
• In case of additional energy requirement, power will be drawn from the Grid

Savings in Electricity Bill

• Majority of the energy requirement will be catered from Solar Energy, thus reducing your DISCOM electricity bill

Scenario-2: Afternoon

Energy Flow

• During daytime, Solar energy generation would be almost sufficient to meet your electricity demand
• Surplus energy generated from Solar will be fed back to grid

Savings in Electricity Bill

• Surplus energy fed back to the grid would be recorded in the Net Meter & credited to your account

Scenario 3: Night

Energy Flow

• After sunset, your electricity requirement will be catered mainly by the grid supply

Savings in Electricity Bill

• After sunset, your electricity requirement will be catered mainly by the grid supply

• Reduction in Utility Electricity Bill; Higher benefits in TOD regime
• Long term reliable power source (up to 25 years )
• Net metering framework under which consumer can export the surplus solar power to DISCOM and avail suitable benefits
• Value creation from unutilized roofs
• Mitigates Air Pollution and Climate Change
• Low Maintenance
• Capital Subsidy for Residential category
• Beneficial for the community and Mother Earth