Blog · Net Metering
TANGEDCO Net Metering FAQ: Everything You Need to Know
Complete guide to net metering in Tamil Nadu: application, approval, billing, and credits for solar rooftop systems.
What is Net Metering?
Net metering is a billing mechanism where solar users can export excess generation to the TANGEDCO grid. The exported units are credited against consumption, effectively "spinning the meter backward." You only pay for net consumption (consumption minus generation).
Application Process
- Submit application: To TANGEDCO with consumer number, system capacity, site photos, and single-line diagram (SLD)
- Feasibility check: TANGEDCO reviews sanctioned load and grid capacity
- Site inspection: TANGEDCO engineer inspects installation and safety measures
- Approval: Agreement issued with terms and interconnection clearance
- Meter installation: Bidirectional meter replaces existing meter (free for residential up to certain capacity)
- Commissioning: System synchronized with grid; billing starts with net metering
Approval Timeline
- Application submission: Day 1
- Feasibility + inspection: Day 5-10
- Approval letter: Day 7-15
- Meter installation: Day 15-22
- Total timeline: Typically 2-3 weeks from application
Billing & Credits
- Billing cycle remains monthly as per existing account
- Excess generation is credited at your consumption tariff rate
- Credits can be carried forward within the financial year (April to March)
- End-of-year surplus may be settled per TNERC regulations (check current policy)
- Fixed charges and taxes apply regardless of net consumption
System Size Limits
- Residential: Typically up to sanctioned load or 1MW, whichever is lower
- Commercial/Industrial: Up to sanctioned load; consult TANGEDCO for >500kW
- Agricultural: Standalone solar pumps may not require net metering; rooftop systems follow standard limits
Required Documents
- Latest TANGEDCO electricity bill
- Property ownership proof (sale deed, pattadar passbook, or tax receipt)
- Aadhaar card and photograph
- System single-line diagram (SLD) with inverter/panel specs
- Site layout showing panel mounting and inverter location
- MNRE subsidy approval letter (if applicable)
Common Questions Answered
- What is net metering? Billing system where excess solar exports to grid get credited against consumption.
- Approval timeline? 7-15 days for inspection/approval; 15-22 days for meter install.
- Excess generation? Credited at your tariff rate; carry forward within financial year.
- Size limits? Residential: up to sanctioned load or 1MW; commercial varies by category.
- Demand charges? Residential: usually none; commercial/industrial: depends on tariff category.