Tamil Nadu is one of India’s largest solar states, yet TNEB solar application and TANGEDCO net metering rejections remain stubbornly high. The usual cause is not grid constraints but drawing format errors. A missing earthing schematic or an SLD that does not follow the division’s expected format gets the entire application sent back, costing the EPC four to six weeks.
This guide gives solar EPCs and rooftop installers operating in Tamil Nadu a working playbook: the drawing set division offices expect, the documents in the right sequence, the five approval stages with realistic timelines, and the twelve rejection reasons we see most often. TANGEDCO’s distribution business now operates as TNPDCL, but most forms and drawings still say TANGEDCO, so this guide uses both names.
Quick answer. A TNEB solar application for rooftop net metering in Tamil Nadu is now filed with TNPDCL, the successor to TANGEDCO’s distribution business. Under TNERC Order No. 8 of 2021, domestic consumers get net metering, other LT consumers get net feed-in, and network charges apply to every unit generated. It needs an SLD, layout, earthing, meter and structural drawings.
TL;DR
- TANGEDCO requires five mandatory drawings: SLD in TANGEDCO line style, General Arrangement/site layout, Earthing and Lightning Protection schematic, Net Meter Connection schematic, and a Structural Load Certificate.
- Processing runs through five approval stages and ranges from 30-45 days for a clean ≤10 kW submission to 75-90 days for a 100 kW - 1 MW system.
- ALMM-compliant modules and MNRE-approved inverters are mandatory, and metro Chennai divisions now require a Grid Synchronisation Certificate for systems above 10 kW.
- Twelve recurring rejection reasons account for roughly 80% of returned applications, the most common is using generic IEC symbols instead of TANGEDCO's own SLD line style.
- Under TNERC Order No. 8 of 2021, net feed-in exports earn ₹3.10 to ₹3.61/kWh depending on system size, and network charges apply to every generated unit. Domestic net metering surplus lapses at year end.
- TNPDCL runs the rooftop procedure and portal; some section offices still expect physical copies, so confirm the filing route locally.
What TANGEDCO Is, and How It Differs from MSEDCL
TANGEDCO, the Tamil Nadu Generation and Distribution Corporation, was the integrated state utility until the 2024 restructuring. Its distribution business now operates as TNPDCL (Tamil Nadu Power Distribution Corporation Limited), which handles rooftop applications, while TNGECL took over green generation. The regulator is TNERC, the Tamil Nadu Electricity Regulatory Commission, the state’s equivalent of MERC in Maharashtra.
Rooftop metering in Tamil Nadu now follows TNERC Order No. 8 of 2021, effective 22 October 2021, which sets the metering options, feed-in tariffs and network charges. TNERC’s 2024 draft regulations propose group and virtual net metering, but treat those as proposals until notified. Our Tamil Nadu solar policy guide explains how these layers fit together.
For a state-by-state comparison of net metering processes and DISCOM jurisdictions, see our guide on DISCOM net metering process across India. For the Maharashtra parallel, see MSEDCL Solar Net Metering Guide.
Key distinction. TNERC governs policy and tariff; TANGEDCO executes the physical connection, drawing review, and meter installation. All drawing submissions go to the TANGEDCO Sub-Division or Division Engineer office serving the connection point, not to a central portal (as of June 2026). For how the 2019 policy and TNERC orders fit together, see our Tamil Nadu solar policy guide.
Jurisdiction Map
| Coverage Area | TANGEDCO Division |
|---|---|
| Chennai and suburban | North, South, Central, Metro divisions |
| Coimbatore district | Coimbatore division |
| Madurai district | Madurai division |
| Salem, Erode, Namakkal | Salem division |
| Tirunelveli, Thoothukudi | Tirunelveli division |
| All remaining 38 districts | Respective district headquarters division |
Unlike Maharashtra’s zone structure (Nashik, Konkan, Pune, Aurangabad, Amravati), TANGEDCO operates through 20+ operational divisions without a formally named zone overlay for net metering. Your application goes to the Division Engineer (DE) or Assistant Engineer (AE) at the sub-division serving your meter connection address.
Eligibility, Consumer Categories and System Size Limits
TNERC Order No. 8 of 2021 sets the metering mechanism by consumer type and size. The table below follows our Tamil Nadu solar policy guide; confirm the current order before you model a project.
| Mechanism | Who uses it | Size limit | How surplus is treated |
|---|---|---|---|
| Net metering | Domestic consumers | Up to sanctioned load | Units offset units. Surplus at year end lapses |
| Net feed-in (net billing) | Other LT categories, except huts and agriculture | Sanctioned load or 999 kW, whichever is lower | Exports earn a feed-in tariff. Credit carries over or is paid out |
| Gross metering | Consumers above 150 kW and non-consumer generators | 151 kW to 999 kW | All generation is sold at the feed-in tariff |
Feed-in tariffs under the order are ₹3.61/kWh for 1 to 10 kW, ₹3.37/kWh for 11 to 150 kW and ₹3.10/kWh for 151 to 999 kW. Network charges of ₹1.27/kWh (LT) and ₹0.83/kWh (HT) apply to every generated unit under net metering and net feed-in, with concessions for domestic consumers; gross metering is exempt.
Field tip. TANGEDCO enforces a hard cap: the sanctioned load on the consumer's service connection determines the upper limit of the grid-tied system. An LT-1B consumer with 5 kW sanctioned load cannot install more than 5 kW without first upgrading their service connection, a separate application entirely.
Eligibility pre-checks before drawing preparation:
- Confirm the consumer’s tariff category matches the table above.
- Verify the sanctioned load on the EB card / latest bill.
- Confirm the rooftop or ground structure is within the same electrical premises as the metered connection.
- Confirm modules carry ALMM (Approved List of Models and Manufacturers) certification per an MNRE order dated August 2022.
- Confirm the inverter appears on the MNRE-approved inverter list (grid-tie inverters, revised quarterly).
The TANGEDCO Drawing Protocol, 5 Mandatory Formats
The TANGEDCO Drawing Protocol is our name for the five drawings that section and division offices check. In our experience, missing any one of them gets the file returned, because officers will not review a partial submission.
Single Line Diagram, TANGEDCO Line Style
Must show PV array → DC combiner (if applicable) → solar inverter → AC isolation switch → net energy meter → grid connection point, using TANGEDCO-standard symbols (not IEC 60617 defaults). The [SLD](/glossary/sld/) must include fault protection device ratings, cable sizes, and a title block naming the consumer's EB service number.
General Arrangement (Site Layout) Drawing
A to-scale roof plan or ground-mount plan showing module positions, row spacing, cable trays, inverter location, earthing pit positions, and distance from the existing meter board. Must include north arrow and scale bar. This is the layout drawing the AE uses to determine grid injection point feasibility.
Earthing and Lightning Protection Schematic
Separate from the SLD, must show GI strip or copper conductor path from each module frame to earthing electrode, inverter body earthing, DC negative earthing (if applicable), lightning arrestor location, and earthing electrode depth and resistance specification (≤5 Ω for structures, ≤10 Ω for LT systems). This is the most commonly incomplete drawing in TANGEDCO submissions.
Net Meter Connection Schematic
Shows the bidirectional net energy meter's position relative to the existing TANGEDCO service entrance, the export power flow path, CT/PT ratios if HT metering applies, and the isolation arrangement. This drawing confirms to TANGEDCO's metering department that the meter board can physically accommodate a net energy meter without altering the service entrance.
Structural Load Certificate (Roof Assessment)
A signed and stamped structural engineer certificate confirming that the roof or mounting surface can bear the additional dead load and wind load of the proposed system under IS 875 Part 3 (wind) and IS 875 Part 1 (dead load). Required for all systems above 5 kW on RCC/sheet metal roofs; de facto required for all systems by most TANGEDCO division offices regardless of size.
Watch out. TANGEDCO sub-division offices in Chennai's metro divisions have been requiring a sixth item since late 2024, a Grid Synchronisation Certificate from a TANGEDCO-empanelled testing agency for systems above 10 kW. Confirm with the DE office at the time of application; adding it retroactively adds 15-20 days.
Full Document Checklist, Submit Nothing Less
The checklist below covers all categories: identity documents, technical drawings, equipment compliance, and payment. Use it as a pre-submission audit with your site team before filing at the TANGEDCO sub-division office.
Category A: Consumer and Property Documents
- Application form (TANGEDCO Net Metering application, available at DE office or tangedco.gov.in)
- Proof of ownership or occupancy of the premises (sale deed, khata, lease agreement)
- Latest TANGEDCO electricity bill (showing service connection number, tariff category, sanctioned load)
- Aadhaar card / PAN card of consumer (or company incorporation certificate for commercial/industrial)
- No-Objection Certificate from building owner if the applicant is a tenant (residential buildings)
Category B: Technical and Drawing Documents
- Single Line Diagram, TANGEDCO line style (Drawing 1 of The TANGEDCO Drawing Protocol)
- General Arrangement / Site Layout drawing (Drawing 2)
- Earthing and Lightning Protection Schematic (Drawing 3)
- Net Meter Connection Schematic (Drawing 4)
- Structural Load Certificate (Drawing 5)
- Grid Synchronisation Certificate (systems > 10 kW, confirm local requirement)
- Load calculation sheet (inverter sizing, string sizing, cable sizing) signed by licensed electrical contractor
Category C: Equipment Compliance
- Module datasheets, ALMM compliance confirmation letter or certificate from module manufacturer
- Inverter datasheet, confirmation that model appears on current MNRE-approved inverter list
- Anti-islanding protection test certificate for the inverter model
- DC surge protection device (SPD) specification sheet
- AC surge protection device specification sheet (required by most metro division offices)
Category D: Contractor and Testing
- Contractor licence: electrical contractor must hold a valid Tamil Nadu Electricity Board (TNEB/TANGEDCO) contractor licence
- Electrical Inspector (EI) or CEIG inspection report (for systems > 25 kW under Tamil Nadu Electricity Rules)
- Installation completion report signed by the licensed contractor
Category E: Payment
- Application fee (₹500 - ₹2,000 depending on system size, check current schedule at DE office)
- Net meter cost deposit (TANGEDCO supplies and installs the bidirectional meter; consumer pays actual cost, typically ₹3,500 - ₹8,000)
Note. CEIG inspection is mandatory under Regulation 45 of the Central Electricity Authority (Measures Relating to Safety and Electric Supply) Regulations for captive generating plants of 1 kW and above connecting to the grid. In Tamil Nadu, the Chief Electrical Inspector to Government (CEIG) office is in Chennai; for systems below 25 kW, many division offices accept the licensed contractor's completion report in lieu of a CEIG visit, confirm with your specific DE office before commissioning.
For CEIG drawing preparation and inspection coordination, see the detailed walkthrough on CEIG drawing approval process in India.
How to Apply: TNEB Solar Application and Net Meter Approval, Stage by Stage
TANGEDCO’s net metering approval process runs in five stages from application submission to meter energisation. The timeline ranges from 30 days for a ≤10 kW LT domestic system with a clean submission to 90 days for a 500 kW HT system requiring Divisional Engineer sign-off.
30-45
Days, ≤10 kW clean submission
Typical range; confirm with the section office
45-75
Days, 10-100 kW LT/HT
Typical range; confirm with the section office
75-90
Days, 100 kW to 1 MW
Typical range; confirm with the section office
5
Drawings in a complete submission
The TANGEDCO Drawing Protocol
Stage 1: Application Submission at Sub-Division Office
The consumer or their authorised EPC submits the complete application package (Categories A through E) in physical form to the AE or ADE at the sub-division serving the connection point. TANGEDCO does not currently accept online net metering applications for new connections, a physical file is required. The officer acknowledges receipt and assigns a file number.
What can go wrong here: Incomplete drawing set. The officer performs a format check, not a technical review, and will return files that lack any of the five drawing types. This is a hard stop; the clock does not start until the full set is accepted.
Stage 2: Technical Feasibility Assessment (DE Office)
The AE forwards the file to the Division Engineer (DE), who assesses whether the local 11 kV / LT feeder serving the premises has adequate hosting capacity for the proposed export. TANGEDCO’s hosting capacity limit per feeder is typically 30% of the feeder’s peak load capacity under the 2019 amended order.
Timeline: 7-15 working days. The DE may issue a technical feasibility letter approving the connection in principle, or a technical infeasibility notice if the feeder is already at capacity, in which case the consumer may request a feeder augmentation or accept a net billing arrangement without export.
Stage 3: Drawing Review and Approval
The DE’s technical team, or a dedicated drawing review team in larger divisions, reviews all five drawings against TANGEDCO’s internal checklist. The SLD is checked for proper fault protection, correct cable sizing, and use of TANGEDCO-standard symbols. The earthing schematic is checked for completeness. The net meter schematic is forwarded to TANGEDCO’s metering department.
Timeline: 10-20 working days. Drawing objections are issued in writing; the EPC must resubmit corrected drawings within the validity period stated on the objection letter (typically 30 days).
Stage 4: Meter Procurement and Installation
Once drawings are approved, TANGEDCO issues a meter connection order and procures a bidirectional net energy meter through its stores department. A TANGEDCO lineman or meter technician visits the premises to install the bidirectional meter in place of the existing energy meter.
Timeline: 7-20 working days from drawing approval, depending on meter stock availability at the regional stores. Delays here are TANGEDCO-internal and outside the EPC’s control, follow up with the DE office every 10 days.
Field tip. Request the meter connection order number in writing before the meter visit. TANGEDCO store tracking is manual at most divisions, the order number lets you follow up directly with the stores manager rather than through the AE chain, cutting 5-10 days off the wait.
Stage 5: Grid Commissioning and Connection
After meter installation, the EPC performs the final grid synchronisation test in the presence of a TANGEDCO AE. For systems above 10 kW, a written grid synchronisation certificate from a TANGEDCO-approved testing agency is required before the AE will sign the commissioning report.
The AE seals the meter board and issues a Net Metering Connection Certificate, this is the document the consumer needs to claim solar subsidies, file CEIG reports, and for any future insurance purposes.
Timeline: 2-5 working days for the site visit; 3-7 days for the connection certificate to be issued.
Net Metering Tariff, Billing, and Settlement in Tamil Nadu
Billing depends on the mechanism. Under domestic net metering, imported and exported units offset each other and any surplus at the end of the year lapses. Under net feed-in, exports earn the feed-in tariff, and network charges apply to every unit the system generates, so the export credit alone rarely covers them.
Net position = units imported from the grid − units exported, before network charges
If the consumer imports more than they export, they pay for the net units at their tariff. Exports under net feed-in are credited at the feed-in tariff, and the credit carries over or is paid out under the TNERC order.
| Billing Scenario | What Happens |
|---|---|
| Monthly net import (> 0) | Consumer pays for net units at tariff rate |
| Monthly net export (< 0) | Domestic: banked against later bills. Net feed-in: credited at the feed-in tariff |
| Year-end surplus | Domestic net metering surplus lapses; check the current order for net feed-in credit |
| Grid unavailability hours | Solar generated but not exported; no credit for that period |
| System downtime due to inverter fault | No credit; consumption billed normally |
PROS, TANGEDCO NET METERING
- Feed-in tariff of ₹3.10 to ₹3.61/kWh on net feed-in exports
- Net feed-in allowed up to sanctioned load or 999 kW, which covers most C&I rooftop projects
- Gross metering option for systems of 151 kW to 999 kW
- Clear separation between domestic and non-domestic mechanisms
- Applicable across all 38 Tamil Nadu districts under one TANGEDCO entity
CONS, TANGEDCO NET METERING
- Network charges on every generated unit hurt oversized systems
- Feeder hosting capacity often constrains dense industrial estates
- Some section offices still expect physical copies alongside the portal
- Meter supply delays (Stage 4) can add 15-30 days with no recourse
- Grid synchronisation certificate requirement for > 10 kW adds cost
Verdict. Tamil Nadu rooftop solar works financially for C&I consumers sized to daytime load, because network charges apply to every generated unit and the export credit alone does not cover them. The operational constraint is processing time and feeder saturation in industrial belts around Coimbatore, Hosur and Tirunelveli. EPCs that pre-check feeder capacity and submit a clean five-drawing package close projects faster than those who learn the format through rejections.
Tamil Nadu Solar Market Context: Why TANGEDCO Net Metering Matters Now
Tamil Nadu has been among India’s top three solar states by cumulative installed capacity for the past four years. According to Mercom India’s Tamil Nadu solar tracker, the state crossed 7,400 MW of total installed solar capacity by Q1 2025, with rooftop and distributed solar accounting for approximately 1,100 MW of that total.
The rooftop segment in Tamil Nadu was historically constrained by two factors: TANGEDCO’s feeder hosting capacity limits in industrial areas, and the drawing-rejection bottleneck at sub-division offices. Both are now being systematically addressed.
Feeder hosting capacity is the other early check. Ask the section office for the feeder’s current position before you finalise the layout, because a saturated feeder can stop a project after the drawings are done.
The IEA Solar PV report 2024 notes that India’s distributed solar growth is increasingly driven by C&I behind-the-meter installations. In Tamil Nadu, the economics of those installations depend on the network charge and feed-in tariff set by TNERC.
For EPCs serving Tamil Nadu’s industrial corridor (the Chennai-Bengaluru highway, the Coimbatore manufacturing belt and SIPCOT estates), rooftop solar sized to daytime load is usually the right recommendation. Run a proper commercial solar ROI calculation that includes network charges before you quote a payback period.
Market signal. PM Surya Ghar is adding residential rooftop volume across Tamil Nadu, and each installation needs a metering connection. EPCs who have TANGEDCO drawing formats standardised and ready to deploy at scale will capture disproportionate share of this volume, the bottleneck is drawings, not demand.
The 12 Most Common TANGEDCO Rejection Reasons
The following rejection causes are the ones we see most often at TANGEDCO section and division offices, based on the Tamil Nadu submissions we have prepared. For the broader national pattern across other utilities, see 25 DISCOM net metering rejection reasons, and how to fix every one.
| # | Rejection Reason | Root Cause | Fix |
|---|---|---|---|
| 1 | SLD uses IEC symbols, not TANGEDCO-standard symbols | Designer used a generic AutoCAD library | Use TANGEDCO-specific symbol set; request the symbol guide from the DE office or use Heaven Designs’ Tamil Nadu SLD template |
| 2 | Earthing schematic missing or merged into SLD | Earthing drawn as a note on the SLD instead of a separate sheet | Draw earthing as a standalone schematic, the TANGEDCO Drawing Protocol requires it as Drawing 3 |
| 3 | Module ALMM compliance not confirmed | Datasheet submitted without the ALMM certificate | Attach manufacturer’s ALMM compliance letter per the August 2022 MNRE order |
| 4 | Inverter not on current MNRE-approved list | Specced an inverter not on the latest quarterly revision | Cross-check against the current MNRE approved inverter list; substitute or get retrospective inclusion letter |
| 5 | Net meter schematic missing | Only the SLD was submitted; separate net meter diagram not provided | Prepare Drawing 4 as a standalone document showing bidirectional meter location |
| 6 | Structural certificate missing or unsigned | Certificate not stamped by a licensed structural engineer | Engage a TANGEDCO-acknowledged structural engineer; confirm stamp acceptance with the DE office |
| 7 | Consumer EB service number not on the SLD title block | Standard title block used without site-specific details | Add the consumer’s 14-digit EB service connection number to the SLD title block |
| 8 | Contractor licence expired or not in Tamil Nadu scope | National-scope licence presented; TANGEDCO requires TN state-specific licence | Verify contractor holds a current TANGEDCO/TNEB electrical contractor licence |
| 9 | Application form incomplete, missing system capacity declaration | Pre-printed form partially filled | Fill all sections including the system capacity declaration and the consumer’s authorisation for the EPC to act as agent |
| 10 | Grid synchronisation certificate missing for > 10 kW system | EPC unaware of post-2024 metro-division requirement | Commission a grid sync test through an empanelled agency before submission |
| 11 | Cable sizing inconsistent between SLD and load calculation sheet | SLD updated without updating the load calculation sheet | Reconcile both documents before submission; TANGEDCO’s reviewer checks for consistency |
| 12 | Wrong sub-division, application filed at headquarters instead of local office | Multi-district EPC filed centrally | Identify the sub-division serving the meter address; all filings must be made at that local office |
Watch out. A single rejection adds 4-6 weeks to the timeline in most TANGEDCO divisions, the return letter, correction, resubmission, and re-queuing cycle is manual at every stage. For EPCs managing 20+ concurrent Tamil Nadu installations, even a 15% rejection rate translates to 3-4 projects in a permanently delayed state, tying up working capital on commissioned systems that cannot start billing.
TANGEDCO vs. MSEDCL Net Metering, Comparison for Multi-State EPCs
EPCs operating across South India and Maharashtra frequently encounter both TANGEDCO and MSEDCL processes in the same year. The table below compares the two on dimensions that affect project cost and timeline.
| Dimension | TANGEDCO (Tamil Nadu) | MSEDCL (Maharashtra) |
|---|---|---|
| Application mode | TNPDCL portal and section office; confirm locally | Physical at zone office; some divisions accept scanned copies |
| Drawing formats required | 5 (TANGEDCO Drawing Protocol) | 5 (MSEDCL Drawing Stack) |
| Regulatory authority | TNERC (Tamil Nadu) | MERC (Maharashtra) |
| Maximum system size | Sanctioned load, or 999 kW for net feed-in | 1 MW (HT, MERC 2023 revision) |
| Export credit | Feed-in tariff ₹3.10-3.61/kWh (net feed-in); network charges apply | Avoided cost basis (₹3.50 - ₹4.20/kWh) |
| Year-end surplus handling | Domestic net metering surplus lapses | Adjusted at MSEDCL’s determined rate |
| Typical LT processing time | 30-60 days | 45-90 days |
| Feeder hosting cap | 30% of feeder peak load | 25-30% per zone-level limit |
| CEIG requirement | > 25 kW (de facto > 10 kW in metro) | > 25 kW for Maharashtra CEIG inspection |
| Contractor licence required | TANGEDCO/TNEB TN-scope licence | MSEDCL electrical contractor licence |
| Grid sync certificate | > 10 kW (metro divisions) | > 25 kW |
Verdict. TANGEDCO and MSEDCL are broadly comparable in difficulty, but differ in where the pain concentrates. TANGEDCO’s main friction is drawing format specificity and section-level processing. MSEDCL’s main friction is the zone-specific queue depth and the 45-90 day base processing time. For multi-state EPCs, building separate drawing templates for each DISCOM, rather than adapting a generic template, is the one operational decision that pays back most clearly in first-pass approval rates.
How Heaven Designs Helps Tamil Nadu EPCs Clear TANGEDCO Faster
The TANGEDCO Drawing Protocol’s five formats are well defined, but executing them across 10 or 20 concurrent Tamil Nadu projects needs a drawing team that knows each format and works from tested templates.
- Solar Rooftop Detailed Engineering Design, full IFC drawing package including the TANGEDCO-format SLD, GA, earthing schematic, net meter schematic and structural load certificate. We confirm the delivery date when we confirm scope.
- Electrical CEIG Drawings, CEIG-approval-ready drawings for Tamil Nadu systems above 25 kW, including the formats accepted by the Chennai CEIG office and district electrical inspectors.
- Solar 3D Pre-Design, sales-stage 3D layout with preliminary shading analysis, so your sales team can confirm rooftop feasibility and sizing before committing to a full drawing set.
- Site Survey & Land Feasibility Services, Feeder hosting capacity pre-check included as part of Tamil Nadu rooftop feasibility assessments, so you know before drawing whether TANGEDCO’s 30% feeder cap is a constraint at the specific connection point.
- Download sample deliverables, sample pack with an SLD and earthing schematic in DISCOM format; it arrives by email within 24 hours.
Heaven Designs has prepared Tamil Nadu net metering drawing sets for several divisions, and keeps symbol libraries and title block templates ready for the next project.
Note. Revisions in response to a drawing objection are handled within the agreed scope. Ask for the revision turnaround in writing before you order from any provider, including us.
For a deeper understanding of how net metering works in India across different state frameworks, the glossary entry covers the regulatory structure and billing mechanics. For a full cross-state comparison including Karnataka (BESCOM), Rajasthan (JVVNL), and Gujarat (UGVCL), see DISCOM net metering process across India.
FAQ
What is the maximum system size for TANGEDCO net metering?
Under TNERC Order No. 8 of 2021, the cap is the sanctioned load at the service connection. Net feed-in for non-domestic LT consumers runs up to the sanctioned load or 999 kW, whichever is lower, and gross metering covers 151 kW to 999 kW. All limits are subject to feeder hosting capacity, so confirm with the section office.
Does TNPDCL (TANGEDCO) accept online rooftop solar applications?
TNPDCL runs a rooftop solar procedure and portal, as our Tamil Nadu solar policy guide notes. Some section offices still ask for physical copies of drawings and documents, so confirm the filing route with the office serving the meter address before you submit.
How long does TANGEDCO take to install the bidirectional net energy meter?
After drawing approval, TANGEDCO issues a meter connection order. Meter installation typically takes 7-20 working days from that order, depending on stock availability at the regional stores. Chennai metro divisions tend to have better stock availability; smaller districts may experience 20-30 day waits. Follow up with the stores manager directly using your connection order number to expedite.
What happens to surplus units at the end of the settlement year?
Under domestic net metering, surplus units left at the end of the settlement year lapse. Under net feed-in, exports earn the feed-in tariff of ₹3.10 to ₹3.61/kWh, and the credit carries over or is paid out under the TNERC order. Network charges still apply to every generated unit, so size the system to daytime load.
Is CEIG inspection mandatory for all TANGEDCO net metering projects?
Under the Central Electricity Authority (Safety Regulations), CEIG inspection is required for captive generating stations of 1 kW and above that connect to the grid. In practice, Tamil Nadu CEIG office processes inspections for systems above 25 kW; for systems below 25 kW, the licensed electrical contractor’s completion certificate is accepted by most TANGEDCO division offices. Always confirm the specific requirement with your DE office before commissioning.
Can a tenant apply for TANGEDCO net metering?
Yes, with conditions. The tenant must submit a No-Objection Certificate from the building owner and confirm that the electricity service connection is in their name or they have a registered lease agreement. If the service connection is in the owner’s name, the owner must be the applicant, or an authorised representative arrangement must be documented.
How does the TANGEDCO net metering process differ from BESCOM in Karnataka?
BESCOM (Bangalore Electricity Supply Company) in Karnataka also uses a five-document submission format, but BESCOM has an online portal for application tracking. TNPDCL also runs a rooftop portal, but some Tamil Nadu offices still expect physical copies.
BESCOM’s processing time is comparable for LT systems (30-60 days) but BESCOM is generally faster on meter installation due to better portal coordination. For EPCs bidding on multi-state South India portfolios, TANGEDCO’s physical process requires more field coordination than BESCOM’s semi-digital workflow.
Summary: What Every Tamil Nadu EPC Must Know
Tamil Nadu rooftop solar is commercially sound when it is sized to daytime load. TNERC Order No. 8 of 2021 sets the mechanisms, feed-in tariffs and network charges, and TNPDCL runs the application. The operational challenge is drawing specificity and section-level processing.
The TANGEDCO Drawing Protocol, five mandatory formats, each distinct, each subject to independent review, is the most valuable item in the EPC’s control.
An EPC that enters every Tamil Nadu project with tested drawing templates, ALMM-confirmed module specs and a licensed contractor on file will clear drawing review far more often at the first attempt than one that adapts generic templates.
For DISCOM-format drawing packages that are ready at the start of the project, not after the first rejection, see Heaven Designs’ rooftop engineering design service.
IRENA’s Renewable Energy Statistics 2023 places India as the third-largest solar market globally by new capacity additions, and Tamil Nadu remains one of the key growth states driving that position. Rooftop net metering is the mechanism translating that state-level policy ambition into individual project economics. Knowing the TANGEDCO process cold is not optional for EPCs serious about Tamil Nadu. It is the prerequisite for operating profitably at scale.