Tata Power DDL Net Metering: Application to Commissioning

If your EPC works in North or North West Delhi, Tata Power DDL net metering is the single DISCOM process you cannot afford to guess at. Tata Power Delhi Distribution Limited (TPDDL) is one of the three Delhi DISCOMs, and Delhi rooftop files are governed by fixed clocks: under the central Rights of Consumers Rules (amended 22 Feb 2024), feasibility is deemed for systems up to 10 kW, and above that the DISCOM has 15 days. A clean application can be held to those dates. A sloppy one gets refiled. This guide walks your team through the full process, from checking the bill header to the first bill with export credits, using our Twin-Track Filing Method so the PM Surya Ghar portal and the TPDDL portal move in parallel instead of in sequence.

The sections below keep two things apart: what the regulations fix (dates, capacity rules, compensation) and what is only field practice. Where we could not open a TPDDL document ourselves, we say so rather than quote a number.

TPDDL jurisdiction and why the bill header matters

Tata Power DDL covers North Delhi, North West Delhi, and parts of North East Delhi, including Rohini, Pitampura, Shalimar Bagh, Model Town, Civil Lines, Narela, Bawana, Alipur, Kirari, and Mangolpuri. Delhi has three DISCOMs, and an application filed with the wrong one has to be refiled.

Before any paperwork, check the electricity bill header:

• "Tata Power Delhi Distribution Limited" or "TPDDL": this guide applies. The consumer number is called the CA (Consumer Account) number.
• "BSES Rajdhani" or "BRPL": South and West Delhi. Use our BSES Rajdhani net metering guide instead.
• "BSES Yamuna" or "BYPL": East and Central Delhi. The DERC rules are the same, but the portal and offices differ.

DERC rules that govern every TPDDL application

The Delhi Electricity Regulatory Commission (DERC) Net Metering for Renewable Energy Regulations 2014, as amended on 26 Jul 2024, apply to all three Delhi DISCOMs (read on the Delhi solar portal, checked 31 Oct 2026). Four parameters decide whether your project is viable before you file:

• Capacity. The 2014 Regulations (reg 5) set a minimum of 1 kWp and make capacity subject to grid feasibility, the available service line capacity and the consumer's sanctioned load. A system above the sanctioned load pays the differential service line charges (reg 5(4)). We found no fixed kW ceiling in these Regulations.
• Energy credit. Surplus units are carried forward to the next billing period as energy credit and netted off before the next invoice (reg 9). Credits still unadjusted at the end of each financial year are paid by the DISCOM at rates notified by DERC. Delhi's earlier generation-based incentive (₹2 to ₹3 per kWh) is discontinued for new residential installations under the Second Amendment to the Delhi Solar Energy Policy 2023 (17 Sep 2026).
• Meters. The net meter and the renewable energy meter are procured and installed by the DISCOM under the Supply Code, though the consumer may buy a net meter and present it for testing and installation (reg 8(3)).
• Group and virtual net metering. DERC notified the Sixth Amendment to its GNM and VNM Guidelines on 5 Jun 2025 and the Seventh on 20 Jan 2026. The Seventh makes the VNM framework applicable to all consumers in Delhi, including single point of supply consumers, and allows the credit ratio or participating connections to change twice in a financial year with two months' notice. This lets housing societies share one plant across multiple meters. Both amendments are covered with other states in virtual and group net metering, state by state.

The Twin-Track Filing Method: 5 stages from application to commissioning

Most installers file the PM Surya Ghar application first, wait, and then start the DISCOM paperwork. That serial approach stretches the project. The Twin-Track Filing Method runs both tracks in parallel: Track A is the consumer's subsidy application on the national portal, Track B is the net metering application on the TPDDL portal. You open both within 48 hours of signing the customer, and each stage below tells you which track it belongs to. Done this way, the subsidy file and the technical sanction move in the same window instead of back to back.

1. 1

   Pre-application verification (both tracks)

   Confirm the bill shows TPDDL supply, the name on the bill matches the applicant's ID proof exactly, and the proposed kWp does not exceed the sanctioned load. For PM Surya Ghar cases, confirm your firm is an empanelled vendor and the modules are ALMM listed. For rented homes and DDA flats, collect the owner NOC or lease documents now, not after rejection.

2. 2

   Portal submission on both tracks

   Track A: the consumer applies at pmsuryaghar.gov.in, selecting Delhi and Tata Power DDL as the DISCOM. Track B: submit the Net Metering Application Form and Registration Form through the TPDDL solar rooftop section at tatapower-ddl.com, or at the local sub-division office. Record both reference numbers against the project in your CRM the same day.

3. 3

   Feasibility and technical sanction (Track B)

   TPDDL's sub-divisional office checks transformer loading and site conditions, then issues the technical feasibility clearance. Up to 10 kW no feasibility study is required and the application is deemed accepted (rule 11(7A), 22 Feb 2024; DERC First Amendment, 26 Jul 2024). Above 10 kW the study is due within 15 days of a complete application, and if the outcome is not communicated the proposal is presumed technically feasible (rule 11(7)). Rule 2(g) of the 2020 Rules defines "days" as clear working days. Ask TPDDL in writing at which stage it wants the Net Metering Connection Agreement and Declaration signed: under rule 11(9) the agreement, meter and commissioning are completed within 15 days of your installation certificate.

4. 4

   Installation and commissioning request (both tracks)

   Install exactly per the sanctioned design. Any change in inverter model or panel make needs an amendment before the commissioning visit. Submit the commissioning request with date-stamped photos, the as-built single-line diagram, and the inverter test certificate showing anti-islanding compliance (IEC 62116 or IS 16169). Ask TPDDL whether your capacity needs Electrical Inspector approval: the CEA Safety Regulations 2023 leave that capacity threshold to the appropriate government (reg 34), and we could not confirm a current Delhi notification. Our solar commissioning process guide has the full pre-visit checklist.

5. 5

   Meter swap, go-live, and subsidy claim (both tracks)

   TPDDL replaces the old meter with the smart bidirectional meter, verifies anti-islanding, and energises export. The consumer then updates the installation details on the national portal with geo-tagged photographs, and the DISCOM inspects. The CFA (Central Financial Assistance) is processed only after the DISCOM has verified the system, and within 15 days of that DISCOM approval (MNRE guidelines, clauses 6(j), 6(k) and 6(t)), then released to the consumer's bank account once the e-token is redeemed. The bank account holder name must match the name on the electricity connection (MNRE consumer manual, 21 Jul 2024). Check the first two bills for exported units and raise any gap straight away with the meter number and commissioning certificate.

Document checklist for the TPDDL portal

Under rule 11(5) of the Rights of Consumers Rules 2020, every DISCOM must display the complete list of required documents and the application and agreement formats on its portal. Download the Net Metering Application Form, Registration Form, Connection Agreement, and Declaration from the TPDDL solar rooftop section before you start, check them against this list, and prepare the full set in one folder.

Common delays and what actually causes them

Clean files let you hold TPDDL to the clocks above. In our experience (field practice, not a TPDDL statistic) a handful of patterns cause most of the slippage, and all of them are preventable at the intake stage. Do not treat the meter swap as automatic after inspection: the rules give the DISCOM 15 days after your installation certificate, so diarise that date and follow up in writing when it passes.

Contact structure and escalation when TPDDL stalls

TPDDL processes net metering at the sub-division level, the same structure as its regular billing operations. Your primary contact is the Junior Engineer (JE) or Assistant Engineer (AE) of the sub-division office that covers the consumer's PIN code. The CA number on the bill identifies the sub-division.

For general queries, use the helpdesk number printed on the bill and the solar section of the TPDDL website. We could not open TPDDL's own pages from our research machine (they block automated access), so confirm the current helpline and manual there rather than from us. Rule 11(5) requires every DISCOM to display a single point of contact for rooftop solar applicants.

If TPDDL misses a statutory clock, use the rule, not the calendar:

1. Feasibility clock. Above 10 kW, if 15 days pass with no outcome, the proposal is presumed feasible (rule 11(7)). Write to the sub-division AE citing the registration number, the date of acknowledgement (the application is deemed received on that date, rule 11(6)) and rule 11(7).
2. Commissioning clock. If the agreement, meter and commissioning are not done within 15 days of your installation certificate, escalate in writing to the zonal office and cite rule 11(9). The DISCOM is liable to pay compensation of not less than ₹500 per day of delay without just cause (rule 11(12)).
3. Grievance forum. File with the DISCOM's Consumer Grievance Redressal Forum (section 42(5) of the Electricity Act; the Rules say a grievance is normally decided within 30 days and in any case within 45), then the Ombudsman appointed by DERC if unresolved. For PM Surya Ghar projects, also raise a grievance on the national portal, which the MNRE guidelines say is resolved within 30 days.

One honest opinion: put the escalation in writing and cite the rule, rather than relying on a personal contact with one JE. A dependency on one officer ends at the next transfer; a written complaint citing rule 11 does not.

TPDDL vs BSES Rajdhani vs MSEDCL: what changes for your team

The DERC rulebook is shared across Delhi, so the TPDDL and BSES processes feel similar. The differences are in portal quality, solar-specific infrastructure, and export economics versus other states.

For the Maharashtra side of this comparison, see our MSEDCL net metering guide, and for a national view the DISCOM-by-DISCOM net metering list.

The tradeoff to discuss openly with customers: Delhi's net metering credit offsets units against your bill, and any balance at year end is paid at a DERC-notified rate, so right-sizing rewards the customer more than max-sizing. As a rule of thumb we use (not a DERC rule), a system sized to 80 to 90 percent of daytime consumption pays back fastest. Selling a 5 kW plant to a home that needs 3 kW adds cost for units that are only credited at year end. That misconception, "bigger plant, bigger savings", is the one to kill in your proposal meeting. Size to the bill, not the roof.

How Quickest Solar CRM fits

The Twin-Track Filing Method only works if your team tracks two reference numbers, five stages, and a follow-up date for every single project. With 15 live TPDDL projects, that is 75 checkpoints living in someone's head or a spreadsheet. Quickest Solar CRM lets you set customisable lead stages and follow-up reminders for each filing step, so the day-15 follow-up after the installation certificate is a reminder, not a memory test. Your team logs activity on each lead, and you see the whole North Delhi portfolio on the dashboard.

• Pipeline Management, customisable stages, one per Twin-Track step, so you spot every file stuck at "Meter Swap Pending" across all sub-divisions at once.
• WhatsApp Follow-up, saved message templates you send from the lead when inspection clears and when the meter date is set, which cuts the "meter kab aayega" calls to your office.
• Proposal Generator, a branded proposal PDF with the PM Surya Ghar subsidy applied, so the right-sizing conversation happens with numbers on the page.
• Sales Reports, the dashboard and team report show how each rep's leads are moving, so your next quarter's lead spend goes where approvals actually land.

What to do this week

Three concrete moves for your EPC in the next seven days:

1. Audit every live TPDDL project against the 5 stages. Write down the filing date and current stage for each. Anything above 10 kW with no feasibility outcome after 15 working days gets a written note to the sub-division AE today, citing rule 11(7).
2. Build your TPDDL document pack. Download the four TPDDL forms (application, registration, agreement, declaration) and store them with your standard ID proof, NOC, and site-plan templates. A complete pack should take 20 minutes to assemble per project, not two hours.
3. Right-size one pending quote. Take your biggest open residential quote, pull the customer's last 12 months of TPDDL bills, and check whether the system size matches 80 to 90 percent of daytime consumption. If it is oversized, resize it and resend the proposal. If you want the PM Surya Ghar subsidy applied in your proposals, book a Quickest Solar CRM demo and send that resized quote the same day.

Frequently asked questions

How long does Tata Power DDL net metering take in 2026?

No single figure is official, but the clocks are. Up to 10 kW, no feasibility study is needed. Above 10 kW, TPDDL must complete the feasibility study within 15 days of a complete application, or it is presumed feasible. After your installation certificate, the DISCOM must sign the agreement, fit the meter and commission within 15 days (Rights of Consumers Amendment Rules, 22 Feb 2024; "days" means working days). Files with name mismatches or roof-rights gaps go back for refiling, which restarts the clock.

Where do I apply for TPDDL net metering online?

Apply through the Solar Rooftop section of tatapower-ddl.com, under Apply for Net-Metering Connection. TPDDL publishes the application form, registration form, connection agreement, and declaration as public downloads on that page. For PM Surya Ghar subsidy cases, the consumer also applies at pmsuryaghar.gov.in and selects Tata Power DDL as the DISCOM. File both within a couple of days of each other.

What is the export tariff for TPDDL net metering?

Delhi net metering is a unit-for-unit adjustment. Surplus units carry forward as energy credit and are netted off before the next invoice, and credits still unadjusted at the end of the financial year are paid at the rate DERC notifies (DERC Net Metering Regulations 2014, reg 9). Check the current notified rate before sizing for export. As a rule of thumb, size to 80 to 90 percent of the household's daytime consumption rather than maximum roof coverage.

What is the maximum system size allowed under TPDDL net metering?

The DERC Net Metering Regulations 2014 set a minimum of 1 kWp and make capacity subject to grid feasibility, the service line capacity and the consumer's sanctioned load; we found no fixed kW ceiling in them. If the proposed size exceeds the sanctioned load, the consumer pays the differential service line charges (reg 5(4)), so raise the load enhancement with TPDDL before the net metering application.

What subsidy does a Delhi household get on rooftop solar in 2026?

Two subsidies stack in Delhi. The central PM Surya Ghar CFA pays ₹30,000 per kW for the first 2 kW and ₹18,000 for the third kW, capped at ₹78,000 (MNRE, 2024). The Delhi government adds ₹26,000 per kW up to 3 kW, capped at ₹78,000, under the Second Amendment to the Delhi Solar Energy Policy 2023 (17 Sep 2026), and total subsidy cannot exceed project cost. A 3 kW household can recover up to ₹1.56 lakh, with the state share paid by DBT to the consumer for PM Surya Ghar applicants.

Can housing societies in North Delhi use group or virtual net metering?

Yes. DERC's GNM and VNM Guidelines were amended on 5 Jun 2025 (Sixth) and 20 Jan 2026 (Seventh). The Seventh applies the VNM framework to all consumers in Delhi, including single point of supply consumers, and lets the credit ratio change twice a year with two months' notice. This lets a society install one plant and distribute credits across multiple member meters, which is the practical route for multi-storey DDA and cooperative buildings where individual roof rights are disputed. Check TPDDL's portal for the current forms.

What is the most common reason TPDDL rejects a net metering application?

In our field experience (not a TPDDL statistic), name mismatch between the electricity bill, ID proof and the portal application is a frequent reason for refiling. Next come incomplete roof-rights documentation for DDA flats and society buildings, and a proposed system size above the sanctioned load. All three are fixable before filing: correct the bill name first, collect the NOC and society resolution at lead stage, and file load enhancement before the net metering application.

Who do I contact at TPDDL when my application is stuck?

Start with the Junior Engineer or Assistant Engineer of the sub-division office identified by the CA number on the bill. For general queries, use the helpdesk number on the bill and the solar section of the TPDDL website. If a statutory clock is missed (15-day feasibility above 10 kW, or 15 days after your installation certificate), write to the sub-division AE citing the rule, then escalate to the zonal office, then the Consumer Grievance Redressal Forum and the DERC-appointed Ombudsman. PM Surya Ghar projects can also raise a grievance on the national portal.