Corrigendum in Solar Tenders (2026): SECI, NTPC & State Discom Guide

Solar tenders in India move fast. So do the rules around them. Every week, SECI, NTPC Green Energy, and state DISCOMs release fresh corrigendums that change deadlines, technical specs, eligibility rules, or scope.

Miss one, and your bid can be rejected on a technicality. Catch it in time, and you can still win the project — sometimes with better terms.

This guide explains everything Indian solar bidders need to know about corrigendums in 2026. You will learn what corrigendums are, why they matter more in solar than in other sectors, who issues them, and how to track them without losing sleep.

What is a corrigendum in a solar tender?

A corrigendum is an official amendment to a tender that has already been published. The issuing agency uses it to correct errors, change conditions, or update timelines.

In solar tenders, corrigendums usually fall into one of these buckets:

• Deadline extension — the bid submission date moves forward.
• Technical change — module specifications, capacity, or ALMM rules get revised.
• Eligibility revision — turnover, net worth, or experience criteria are softened or tightened.
• Scope change — capacity is increased, sites are added, or O&M terms are modified.
• Pre-bid clarification — answers to bidder queries, formally absorbed into the tender.

Once issued, the corrigendum becomes legally binding. It overrides the original tender on every point it touches. Bidders must follow the latest version, not the first one they downloaded.

Why solar tenders see more corrigendums than other categories

Solar projects sit at the intersection of policy, technology, and finance. All three move quickly. As a result, solar tenders see more amendments than civil or supply contracts.

Here is what drives the volume:

• ALMM and DCR rules keep evolving. The Approved List of Models and Manufacturers (List-I for modules, List-II for cells) is updated regularly. When MNRE changes the list, every active tender that referenced it needs a corrigendum.
• Tariff caps shift with market signals. Module prices, financing costs, and rupee-dollar rates change. Issuing agencies often revise ceiling tariffs mid-tender to keep auctions viable.
• Storage and hybrid configurations are still maturing. Round-the-Clock (RTC), Firm and Dispatchable RE (FDRE), and BESS-bundled tenders often need clarifications during the bid window.
• Bidder participation matters. If pre-bid response is weak, agencies extend deadlines and relax criteria to attract more developers.

Quick context: SECI alone has issued thousands of tenders, including programs like solar-wind hybrid, RTC, FDRE, and rooftop RESCO models. Each new program structure brings fresh ambiguity — and fresh corrigendums.

The 6 most common types of corrigendums in solar tenders

1. Deadline extension

This is the most frequent type. The original bid submission date is pushed by 7, 15, or even 30 days. SECI’s January 2026 RESCO Tranche-VIII tender, for example, was floated and then revised before bidding closed. Capacity was bumped from 13.04 MW to 17.77 MW after a corrigendum.

2. Technical specification change

Module wattage, cell technology, ALMM list version, BESS round-trip efficiency, or PCS specifications get updated. In rooftop tenders, mounting structure design and net-metering terms are often revised through corrigendums.

3. Financial criteria revision

Turnover thresholds, net-worth requirements, or EMD amounts are softened to widen participation — or tightened to filter out weaker bidders. For instance, a recent NGEL hydrogen tender set turnover at ₹59 crore over the last three years and EPC experience at ₹47 crore. Such numbers can move during the tender window.

4. Scope or capacity change

Total tender capacity, project locations, or PPA tenure may be modified. SECI sometimes adds “greenshoe” capacity through a corrigendum, allowing it to expand award size at the same tariff.

5. Pre-bid query response, formalised

After every pre-bid meeting, the issuing agency releases bidder queries and official answers. When those answers change tender terms, they appear as a corrigendum — not just minutes.

6. Tariff cap or PPA term changes

Ceiling tariffs, escalation clauses, payment security mechanisms, or curtailment provisions may be amended. These are the costliest corrigendums to miss because they directly hit project IRR.

SECI corrigendums — where to find them

The Solar Energy Corporation of India (SECI) is a Navratna PSU under the Ministry of New and Renewable Energy. It is the largest solar tender issuer in the country.

SECI issues tenders for utility-scale solar, hybrid, RTC, FDRE, BESS, manufacturing-linked PLI projects, and rooftop solar under the RESCO model. Each program has its own bidding cycle — and each cycle produces multiple corrigendums.

Where SECI publishes corrigendums:

• SECI tenders portal — seci.co.in/tenders
• Central Public Procurement Portal (CPPP) — for tenders routed through GeM or eProcure
• GeM portal — for service contracts, O&M, and supply tenders below the program threshold

SECI corrigendums typically arrive in three waves: right after the pre-bid meeting, mid-way through the bid window, and a final one within 48 hours of the original deadline. Plan for all three.

Common SECI corrigendum patterns

• RESCO rooftop tenders — capacity revisions and EMD restructuring are common.
• VGF and PSU scheme tenders — DCR module compliance and ALMM List-II cell sourcing rules often change.
• RTC and FDRE auctions — storage configuration, dispatch profile, and curtailment terms see frequent updates.
• Module supply tenders — package size, EMD per package, and DCR proof requirements get revised.

NTPC RE / NGEL corrigendums — where to find them

NTPC Limited, India’s largest power generator, runs its renewable energy business through NTPC Green Energy Limited (NGEL). NGEL targets 60 GW of renewable capacity by 2032. To get there, it tenders constantly.

NGEL issues tenders for solar PV plants, BESS, hybrid projects, green hydrogen infrastructure, and O&M services. Recent examples include a 540 MW O&M tender for Nokhra and Devikot solar plants in Rajasthan, and a hydrogen refuelling station at Kandla, Gujarat.

Where NGEL and NTPC publish corrigendums:

• NGEL tenders page — ngel.in/tender
• NTPC Tender portal — ntpctender.ntpc.co.in (filter by Renewable region)
• NTPC eProcurement — eprocurentpc.nic.in
• GeM portal — for O&M, supply, and ancillary services
• CPPP — for centrally listed tenders

NGEL corrigendum specifics to watch

NGEL solar tenders use a two-envelope structure: technical bid in Envelope 1, financial bid in Envelope 2. Corrigendums most often touch:

• Eligibility routes (multiple qualification paths get added or removed)
• EPC experience thresholds
• Annual turnover and net-worth requirements
• EMD amount and validity period
• Pre-bid query timeline and bid opening dates

Bidders should also watch for corrigendums on Class-I and Class-II local supplier classification, which affects eligibility under Make in India provisions.

State DISCOM solar corrigendums — the fragmented landscape

State DISCOMs and state nodal agencies issue some of the largest solar tenders in the country. They are also the hardest to track. Each state runs its own portal, with its own format and its own corrigendum publishing rhythm.

Here are the major state-level solar tendering bodies and where they publish:

State DISCOM tenders carry their own quirks. PSPCL recently announced results for a 500 MW solar auction. Puducherry’s rooftop programs run through SECI but settle at state-level discom rates. Each portal has different corrigendum naming conventions, file formats, and email-alert reliability.

⚠ Common bidder mistake: Many bidders register on only one or two portals and miss corrigendums on related state portals where the same project’s PPA actually sits. If you are bidding on a Tamil Nadu solar park, watch TANGEDCO, the state e-procurement portal, and CPPP — corrigendums can drop on any of them.

How to track solar corrigendums efficiently

The manual approach has three steps. First, register on every relevant portal — SECI, NGEL, NTPC eProcure, CPPP, GeM, and each state portal you bid on. Second, set up email alerts where available (most state portals have unreliable alert systems). Third, check each portal manually every 24-48 hours during a live bid window.

This works. But it eats 8-12 hours a week for a serious bidder.

The smarter approach uses an aggregator that watches every portal in real time, normalises corrigendum data, and pings you the moment something changes on a tender you are tracking.

What to look for in a corrigendum tracker

• Coverage of all major issuing bodies — SECI, NGEL, NTPC, every state DISCOM, CPPP, GeM, and major nodal agencies.
• Real-time alerts — push or email notifications within minutes of publication, not next-day digests.
• Corrigendum highlighting — exactly what changed, not just “tender updated”.
• Document download history — every version of the tender preserved, so you can compare old vs new.
• Solar-specific filters — by capacity, technology (PV, hybrid, BESS), state, and developer mode (RESCO, CAPEX, EPC).

What to do the moment a corrigendum drops on your bid

Corrigendums create urgency. The team that responds fastest usually wins. Here is the response checklist:

1. Read the entire corrigendum, not just the summary line. Agencies sometimes bury small but critical changes deep in the document.
2. Compare against the original tender. Note every changed clause — deadline, eligibility, technical, financial, EMD, PBG, PPA, scope.
3. Reassess your eligibility. If turnover or experience criteria changed, confirm you still qualify. If they relaxed, reconsider whether to bid.
4. Update your financial model. Tariff cap revisions, PPA tenure changes, or curtailment clauses can flip a project from viable to unviable in minutes.
5. Re-validate your documents. If the EMD amount or validity changed, reissue the bank guarantee. If technical specs changed, get fresh OEM compliance certificates.
6. Inform your consortium / EPC partner. Everyone in the bid stack needs to see the corrigendum simultaneously.
7. File a fresh pre-bid query if anything is unclear. Most corrigendums create new ambiguities. Use the next clarification window to resolve them.
8. Lock in the new submission timeline. Update internal calendars, courier dispatch dates, and DSC validity checks.

Frequently Asked Questions

How many corrigendums can a single solar tender receive?

There is no legal cap. Large SECI and NGEL tenders frequently receive 5 to 10 corrigendums during a bid window. Smaller state DISCOM tenders usually see 1 to 3.

Is the corrigendum legally binding even if I missed it?

Yes. Once published on the official portal, the corrigendum becomes part of the tender document. Bidders are expected to track and comply, regardless of whether they received an email alert.

Can I challenge a corrigendum?

You can raise objections during the pre-bid clarification window or through formal representation to the issuing agency. In rare cases, bidders approach the High Court or CERC if a corrigendum violates published bidding guidelines.

What is the difference between a corrigendum and an addendum?

A corrigendum corrects or modifies existing tender terms. An addendum adds new information without changing what was already published. In practice, Indian agencies often use the terms interchangeably.

Do corrigendums affect EMD or Performance Bank Guarantee?

Sometimes. If the deadline is extended, the EMD validity must usually be extended too. Always re-read the EMD clause after every corrigendum and reissue the bank guarantee if needed.

Where do most SECI solar tender corrigendums get published first?

The SECI tenders portal at seci.co.in/tenders is the primary source. CPPP and GeM mirror the same documents within a few hours. For RESCO and rooftop programs, GeM is often the fastest channel.

How do I avoid missing a corrigendum on a state DISCOM tender?

Register on the state e-procurement portal, the DISCOM website, and CPPP. Better still, use a tender aggregator like TenderKosh that monitors all three simultaneously and sends real-time alerts.

Have a question on a specific solar tender corrigendum? Drop it in the comments below — our team responds to every query.