Nimesh Katariya TNERC (Tamil Nadu Electricity Regulatory Commission) is the state regulator for Tamil Nadu's power sector, constituted in 1999 under the Electricity Regulatory Commissions Act, 1998 and now functioning under the Electricity Act, 2003. It sets tariffs and issues orders on rooftop solar, open access, and wheeling that solar developers must follow.
Key Takeaways
- TNERC = Tamil Nadu state electricity regulator.
- Net metering only for ≤ 10 kW residential.
- Above 10 kW: gross metering at low feed-in rates.
- TANGEDCO is primary DISCOM.
- Restrictive for commercial rooftop solar.
Why TNERC’s Policy Matters for Project Economics
TNERC’s decision to cap net metering at 10 kW residential, and push everything else onto gross metering, changes the underlying economics of a Tamil Nadu solar project compared to states like Karnataka or Gujarat, where net metering extends up to 1 MW. Under gross metering, a system’s exports are paid at TANGEDCO’s feed-in tariff rather than offset against the customer’s retail rate, so the value of each exported unit is set by the feed-in tariff rather than by how much the customer would otherwise have paid at retail.
Any commercial or industrial rooftop proposal in Tamil Nadu above 10 kW needs to model cash flow on that gross-metering basis from the start, not assume net-metering-style bill offsetting.
TNERC vs. Other State Regulators
TNERC sits in the same role as KERC in Karnataka, MERC in Maharashtra, or GERC in Gujarat, a State Electricity Regulatory Commission (SERC) that issues the tariff and net metering orders its state’s DISCOMs must follow.
Where TNERC differs is in how restrictive that policy is: the 10 kW net metering cap is one of the tightest in the country, and it’s why Tamil Nadu shows up as a stricter outlier in comparisons of net metering across Indian states.
Related Reading
Because TNERC’s gross-metering threshold changes how a commercial system’s export revenue is calculated, it’s worth running the numbers through a proper commercial solar ROI model before quoting a Tamil Nadu project above 10 kW. Our state-wise breakdown of solar permit processing times in India also covers how TNERC and TANGEDCO approval timelines compare to other states’ DISCOMs, which is useful context for scheduling.
For the broader mechanics of how Indian net metering programs work state by state, Heaven Green Energy’s net metering guide explains the bidirectional-meter and billing-credit process that TNERC restricts more tightly than most other regulators.
The state rules are summarised in the Tamil Nadu solar policy guide.
Disclosure: Heaven Green Energy and QuickEstimate are Heaven Designs group companies.
Frequently Asked Questions
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