- The DISCOM is TANGEDCO / TNPDCL (under TNEB); the regulator is TNERC.
- Tamil Nadu leans toward net billing / net feed-in, not pure net metering (verify by category).
- ALMM List-I is needed for subsidy and most approvals; the model number must match.
- DCR applies mainly to PM Surya Ghar residential subsidy in TN.
- The List-II cell mandate (~1 Jun 2026) may have been deferred — confirm status as of 20 Jun 2026.
- Every cap, rate and subsidy figure here is point-in-time — verify against TANGEDCO/TNERC primary sources.
If you build rooftop solar in Tamil Nadu, TANGEDCO net metering, ALMM and DCR decide whether your project gets approved and paid. Get the module list and the settlement type wrong and TANGEDCO can hold or reject the file. This guide ties the three rules together for a TN EPC.
What ALMM, DCR and net metering mean for a TN EPC
For a Tamil Nadu EPC, these are three separate gates on the same project. ALMM is the Approved List of Models and Manufacturers from MNRE — your module model must be on it. DCR is the Domestic Content Requirement — module and cells made in India, needed where the scheme says so. Net metering is how TANGEDCO connects your system to the grid and settles the energy.
They are not the same check
A module can be on ALMM List-I but not be DCR. ALMM proves the model is approved; DCR proves it is made in India. A subsidy job needs both. A plain C&I job often needs neither, only a grid-code-safe module. Knowing which gate applies to a given Tamil Nadu project keeps you from over-buying or under-buying.
TANGEDCO / TNPDCL and TNERC — who runs the scheme
In Tamil Nadu the DISCOM is TANGEDCO, now also called TNPDCL (Tamil Nadu Power Distribution Corporation Limited) and part of the wider TNEB group. TANGEDCO/TNPDCL processes your net-metering or feed-in application, inspects the install, and fits the bidirectional meter.
TNERC sets the rules
The Tamil Nadu Electricity Regulatory Commission (TNERC) is the state regulator. TNERC writes the solar and net-metering regulations, sets the category caps, and fixes any feed-in or net-billing rate. When TANGEDCO and TNERC sources disagree with anything here, the official TNERC order wins. Always read the current order, because the Commission revises it.
Why the split matters to you
TANGEDCO runs the day-to-day approval; TNERC decides what is allowed. If a rate or cap looks wrong at the TANGEDCO counter, the answer sits in the live TNERC regulation. Quote the order number when you escalate. Treat every cap and rate in this guide as point-in-time and verify it against TANGEDCO/TNERC primary sources.
Net metering, net billing and net feed-in in Tamil Nadu
Tamil Nadu is distinctive: TNERC has leaned toward net billing and net feed-in for many categories rather than pure unit-for-unit net metering. That means your exported units may be paid at a TNERC-set rate, while your imported units are billed at the normal retail tariff — not simply cancelled out.
Why this changes your sales pitch
Under pure net metering, one exported unit offsets one imported unit, so the customer saves the full retail rate. Under net billing, the export rate is usually lower than the retail import rate, so the payback maths is different. If you quote a TN customer using net-metering savings, the real bill under net billing can disappoint them.
Confirm the settlement before you quote
The settlement type and any feed-in rate depend on the consumer category and the live TNERC regulation. Do not assume. Check the current TANGEDCO procedure and TNERC order for the exact category, and label every figure you give the customer "verify against TANGEDCO/TNERC primary sources". This protects your quote and your credibility.
Does a Tamil Nadu project need ALMM List-I?
For most subsidy-linked and many net-metering projects in Tamil Nadu, yes — the module must be on ALMM List-I. The list identifies an approved model by its exact model number, not just the brand. A brand can have one model enlisted and another not, so the BOM must name the right model.
How to read the live list
Do not trust a printed list or a supplier's word. Open the live ALMM list on the MNRE portal and match your exact model number. Enlisted capacities and model entries change often, and some entries are point-in-time, so verify each one on the MNRE portal before you raise the purchase order.
Where DCR applies in Tamil Nadu
DCR applies in Tamil Nadu mainly for the PM Surya Ghar residential rooftop subsidy. There the module and its cells must be made in India, and you must prove it with a DCR certificate from the NISE DCR portal. Without that certificate, the subsidy claim fails even if the module is on ALMM List-I.
C&I and open-access often skip DCR
Many commercial, industrial and open-access projects in Tamil Nadu do not need DCR. They can use a non-DCR module as long as it meets ALMM and grid rules. So a TN EPC may run DCR stock for subsidy homes and non-DCR stock for C&I — two streams, tracked separately. Confirm the current DCR rule against the MNRE and PM Surya Ghar sources before each job.
The List-II cell mandate — confirm its status
The ALMM List-II cell mandate means the cells inside an approved module must come from an enlisted Indian cell maker. It was set to take effect around 1 June 2026, but it faced deferment requests and court proceedings, including matters before the Karnataka High Court. Its status is not settled.
Do not build a BOM on an unconfirmed date
Treat the List-II date as point-in-time. Confirm whether it was deferred in the latest MNRE order, status as of 20 June 2026, before you assume your cells must be List-II enlisted for a TANGEDCO job. If it is live, your DCR and many subsidy modules will need enlisted Indian cells; if deferred, the old rule still holds. Check the MNRE portal directly.
Net metering vs net billing vs feed-in — TN at a glance
The table below compares the three settlement types you may meet in Tamil Nadu. The category mapping is indicative only — TN leans toward net billing for many categories, but the exact rule depends on the live TNERC order.
Caption: Indicative comparison only. Source: TNERC solar / net-metering regulations and TANGEDCO procedure — verify the current settlement type, caps and rates against TANGEDCO/TNERC primary sources for your exact consumer category.
Keeping a TANGEDCO BOM compliant
A compliant Tamil Nadu BOM starts before you buy. Lock the exact module model, confirm it is on ALMM List-I, and decide whether the job needs DCR. Then record the model numbers and serials so the BOM, the invoice and the installed panels all match. TANGEDCO can check this at inspection.
A quick pre-order checklist
- Model on ALMM List-I — match the exact model number on the live MNRE list.
- DCR if subsidy — get the DCR certificate from the NISE portal for PM Surya Ghar jobs.
- List-II cells if in force — confirm the latest MNRE order before assuming, status as of 20 Jun 2026.
- Capacity within the cap — keep system size within the TNERC/TANGEDCO category cap (verify).
- Serials captured — log every panel serial so it ties to the invoice and the install.
For the cross-state view of how ALMM ties to the connection itself, see ALMM at net-metering approval.
Common reasons TANGEDCO rejects a file
Most TANGEDCO rejections come down to a module or a number that does not match. Avoid these and your approval is far smoother.
- Module not on ALMM List-I — the exact model is not enlisted, or only the brand is.
- No DCR certificate — a PM Surya Ghar subsidy job with a non-DCR or unproven module.
- Capacity or load breach — system size above the sanctioned load or the category cap (verify).
- Serial mismatch — the installed panel serials do not match the BOM or invoice.
- Wrong settlement assumed — applying for net metering where TN expects net billing for that category.
Each of these is fixable before you submit. A single source of truth for the BOM, serials and certificate stops most of them at the door.
Documents for the connection application
TANGEDCO asks for a standard document set with the net-metering or feed-in application. Have these ready so the file is complete on the first submission.
- Consumer details and sanctioned load — the existing TANGEDCO service number and load.
- System design and capacity — sized within the allowed category cap (verify).
- Module and inverter details — model numbers, ALMM List-I reference and datasheets.
- DCR certificate — for PM Surya Ghar subsidy jobs, from the NISE DCR portal.
- Invoices and serials — matching the installed equipment for inspection.
The exact list and forms can change, so confirm the current requirement on the TANGEDCO portal before you compile the file.
C&I versus residential — the key differences
Residential and C&I projects in Tamil Nadu follow different gates. A residential PM Surya Ghar job usually needs ALMM List-I plus a DCR certificate and runs under the subsidy rules. A C&I rooftop job often needs ALMM but not DCR, and may settle under net billing or a feed-in arrangement rather than pure net metering.
Match the stream to the customer
This is why a TN EPC keeps two material streams. DCR stock goes to subsidy homes; non-DCR stock can go to C&I, where it is usually cheaper. Mixing them up — a non-DCR panel on a subsidy roof — is a direct route to a failed claim. For when DCR is mandatory versus optional, read ALMM/DCR for C&I and captive.
How SuryaHub helps a Tamil Nadu EPC stay compliant
SuryaHub enforces the ALMM and DCR rules where they actually bite — on the BOM and the application. In procurement and inventory, SuryaHub checks every module against the ALMM and DCR rules before you order, and keeps the DCR certificate and panel serials tied to the job. In government workflows, it runs the TANGEDCO net-metering and subsidy steps so nothing that gates approval slips. SuryaHub is pre-revenue; the only real pilots are Suryantra Energy and RGESPL, and every figure here is a scheme fact to verify, not a guarantee.
Catch a non-compliant module before you buy
See how SuryaHub checks every BOM against ALMM and DCR for TANGEDCO jobs.
Related guides
Frequently asked questions
Which DISCOM runs net metering in Tamil Nadu?+
TANGEDCO, now also called TNPDCL and part of TNEB, is the DISCOM that runs net metering and feed-in connections in Tamil Nadu. TNERC, the Tamil Nadu Electricity Regulatory Commission, sets the rules and rates. Confirm the current category caps and settlement type on the TANGEDCO and TNERC portals.
Does Tamil Nadu use net metering or net billing?+
Tamil Nadu uses a mix. TNERC has moved many consumer categories toward net billing and net feed-in rather than pure unit-for-unit net metering, so export is paid at a set rate while import is billed at retail. The exact settlement type and rate depend on your category and must be verified against TANGEDCO and TNERC primary sources.
Do I need ALMM List-I for a TANGEDCO solar project?+
For most subsidy-linked and many net-metering projects in Tamil Nadu, yes. The module model must be enlisted on ALMM List-I, identified by its exact model number, not just the brand. TANGEDCO can check this at approval. ALMM rules change often, so verify against the current MNRE order and the live ALMM list.
Where does DCR apply in Tamil Nadu?+
DCR applies in Tamil Nadu mainly for PM Surya Ghar residential rooftop subsidy. There the module and its cells must be made in India and proven by a DCR certificate from the NISE portal. Many C&I and open-access jobs do not need DCR. Confirm the current rule against the MNRE and PM Surya Ghar sources.
Is the ALMM List-II cell mandate in force for Tamil Nadu in June 2026?+
The ALMM List-II cell mandate was set around 1 June 2026, but it faced deferment requests and court proceedings, so its status is uncertain. Treat it as point-in-time, not settled. Confirm whether it was deferred in the latest MNRE order, status as of 20 June 2026, before you build a TANGEDCO BOM around it.
What is the most common reason TANGEDCO rejects a net-metering file?+
The most common reasons are a module not on ALMM List-I, a missing DCR certificate for a subsidy job, a sanctioned-load or capacity cap breach, and a serial-number mismatch between the BOM, the invoice and the installed panels. Keep the model numbers and serials identical everywhere to avoid a TANGEDCO rejection.
How does SuryaHub help with TANGEDCO ALMM and DCR compliance?+
SuryaHub checks every BOM against the ALMM and DCR rules before procurement, stores the DCR certificate and serials, and runs the TANGEDCO net-metering and subsidy workflow so nothing is missed. SuryaHub is pre-revenue; the only real pilots are Suryantra Energy and RGESPL, and all figures here need verifying.
Sources & references
Rules, rates and the DCR requirement come from primary government sources. Tamil Nadu net-metering, net-billing and feed-in rules are distinctive and change often, so always confirm the current position against TANGEDCO and TNERC before you quote or apply.
- TANGEDCO / TNPDCL (TNEB) ↗
The Tamil Nadu DISCOM that runs net metering and feed-in connections.
- Tamil Nadu Electricity Regulatory Commission (TNERC) ↗
The SERC that sets net-metering, net-billing and feed-in rules and rates.
- Ministry of New & Renewable Energy (MNRE) ↗
ALMM orders, the List-I/List-II rules and the PM Surya Ghar DCR requirement.
Written by the SuryaHub team · reviewed against MNRE, TANGEDCO & TNERC sources · updated 20 June 2026.
Method: ALMM, DCR and TANGEDCO/TNERC net-metering rules are taken from the primary sources above and re-checked regularly. All TN caps, net-billing rates and subsidy figures are point-in-time and must be verified against TANGEDCO/TNERC primary sources. SuryaHub is pre-revenue; only Suryantra Energy and RGESPL are real pilots.
Change log: 20 Jun 2026 — first published.