Assam rooftop solar and net metering calculator
What would rooftop solar do to your Assam bill? Enter your use and system size to see the bill with net metering, the PM Surya Ghar subsidy and the payback.
- Assam’s own net metering rules
- PM Surya Ghar subsidy built in
- Bill run through the current tariff
Enter your units to see the bill.
Assam net metering rules
- APDCL gives net metering for loads up to 10 kW and gross metering for loads above 10 kW (AERC Solar PV Regulations 2019, Second Amendment 2024, reg. 4). Source
- An LT consumer's system can be up to 100% of the connected load or contract demand (First Amendment 2024, reg. 6.3). Source
- Excess units in a billing period carry forward as a credit. Credits offset only kWh used, not other fees and charges (Regulations 2019, reg. 8.1). Source
- At the end of the settlement period, the discom pays for excess units at AERC's average power purchase cost. Carried units then reset to zero (reg. 8.2). Source
- The average power purchase cost for settling rooftop solar energy in 2026-27 is ₹5.80 a unit (AERC APDCL Tariff Order, 6 March 2026, para 6.7.11). Source
- Rooftop systems under net or EXIM metering pay no wheeling charge or cross-subsidy surcharge (reg. 11). Source
- APDCL has asked AERC to stop paying for year-end surplus. On 5 August 2026 AERC told APDCL to keep applying the existing rules while it decides. Source
Default generation of 100 units per kW a month: the Union Cabinet's PM Surya Ghar note says a 3 kW system 'will be able to generate more than 300 units a month on an average'. Source
PM Surya Ghar central subsidy: ₹30,000 a kW for the first 2 kW and ₹18,000 for the third kW, no more above 3 kW (₹78,000 at most). Grid-connected homes only, domestic-made modules, once per home. MNRE benchmark cost ₹50,000 a kW up to 2 kW and ₹45,000 a kW above. Scheme runs to 31 March 2027. MNRE guidelines
Assam is a special category State: the subsidy is ₹33,000 a kW for the first 2 kW and ₹19,800 for the third kW (₹85,800 at most). The calculator uses these rates. See the PM Surya Ghar subsidy calculator.
Rooftop solar questions
How does net metering work?
A two-way meter records what you draw from the grid and what your panels send to it. On each bill the units you exported are taken off the units you imported, and you pay for the net units at the normal tariff. What happens to extra units depends on the state: some buy them every month, others carry them forward and settle at the end of the year.
How much does a 1 kW rooftop system generate?
The Union Cabinet’s note on PM Surya Ghar says a 3 kW system makes over 300 units a month on average, about 100 units per kW. MNRE says 1 kW can make 4 to 5.5 units on a clear sunny day. Your roof’s direction, shade and dust change this, so you can edit the figure.
How much is the PM Surya Ghar subsidy?
For homes: ₹30,000 a kW for the first 2 kW and ₹18,000 for the third kW, so ₹78,000 for 3 kW or more. Higher amounts apply in special-category states. The system must be grid-connected and use domestically made modules, and a home can get it only once. The scheme runs until 31 March 2027.
Do I still pay a fixed charge with solar?
Yes. In every state covered here, fixed charges and government levies stay payable whatever your solar credits.