TNEB Solar Bill Calculator – Estimate Savings, PM Surya Ghar Subsidy & ROI
Planning to install rooftop solar panels in Tamil Nadu? Use our free TNEB Solar Bill Calculator to determine how much you can offset your TANGEDCO household or commercial electricity bill. Calculate your estimated bimonthly energy savings, look up government subsidies under the PM Surya Ghar Yojana, find your net investment cost, and find the payback ROI timeframe instantly.
TNEB Solar Calculator
Rooftop Solar Bill, Subsidy & ROI Savings Calculator 2026
What is the TNEB Solar Bill & Savings Calculator?
The TNEB Solar Bill & Savings Calculator is an interactive, free online utility designed to evaluate the financial feasibility of installing a rooftop solar energy system in Tamil Nadu. It calculates the offset units generated by your panels, computes net grid bill charges (under TANGEDCO net-metering slabs), applies direct government subsidies, and details your return on investment timeline.
PM Surya Ghar Muft Bijli Yojana Subsidy Structure
For residential households (Domestic connection LT-IA), the Government of India provides a direct financial subsidy to reduce upfront solar installation costs. This program makes solar highly accessible and accelerates your investment payback:
| Solar System Capacity | Average Setup Cost | Government Subsidy Amount | Your Net Upfront Investment |
|---|---|---|---|
| 1 kW System | ₹60,000 – ₹65,000 | ₹30,000 (Flat) | ₹30,000 – ₹35,000 |
| 2 kW System | ₹1,20,000 – ₹1,30,000 | ₹60,000 (Flat) | ₹60,000 – ₹70,000 |
| 3 kW or Higher | ₹1,80,000 – ₹1,95,000 | ₹78,000 (Maximum Cap) | ₹1,02,000 – ₹1,17,000 |
Step-by-Step Solar Net-Metering Examples
Let’s look at how a 3 kW Solar System (which generates approx. 720 Units bimonthly) reduces the bimonthly bills of a domestic household (LT-IA) under TNEB slabs:
Full Offset (0 Units Net)
- Normal Bill (Without Solar – 600 units)
₹4,330.00 - New Bill (With Solar – 0 units net)
₹0.00 - Net Bimonthly Savings
₹4,330.00
Partial Offset (180 Units Net)
- Normal Bill (Without Solar – 900 units)
₹7,730.00 - New Bill (With Solar – 180 units net)
₹396.00 - Net Bimonthly Savings
₹7,334.00
How to Apply for TNEB Solar Net-Metering Connection
To transition to solar and enable net-metering on your TNEB connection, follow this standard procedure:
1
Submit Feasibility Request
Register on the National Rooftop Solar Portal and apply for a technical feasibility check from TANGEDCO.
2
Choose Registered Vendor
Select a TANGEDCO empanelled vendor to install the solar panels and inverter setup according to standards.
3
Bi-Directional Meter Install
TANGEDCO inspects the installation, replaces your standard energy meter with a net meter, and commissions the system.
4
Receive Subsidy Credit
The government inspects the commissioned system online and releases the subsidy amount directly to your bank account within 30 days.
Frequently Asked Questions (FAQ)
Have questions about setting up solar or calculating returns? Check these answers to common queries:
No. The PM Surya Ghar Yojana central subsidy is strictly reserved for residential households (LT-IA connections). Commercial or industrial installations do not receive cash subsidies but can claim accelerated depreciation tax benefits.
For domestic connections, if generation is greater than consumption, your active energy charges will be ₹0.00. However, for commercial LT-V and industrial connections, you must still pay the load-based monthly fixed charges.
A bi-directional net meter is a special utility meter that measures electricity flowing in two directions: energy imported from the grid to run your appliances, and surplus solar energy exported back to the grid.
Most modern solar panel systems have a standard manufacturer warranty of 25 years. The system remains highly efficient, losing less than 0.5% to 0.8% of its generation capacity annually.