Planning a bid for a substation or power line tender
A working timeline for preparing a tender for substation, overhead line or cable works: what to do in which week, which supplier quotes to request first, and the submission mistakes that disqualify good bids.
A substation or line tender typically gives you somewhere between five and ten weeks, and in two-stage procedures the final tender stage can be much shorter. That sounds like plenty until you wait three weeks for a transformer quote. This guide lays out a timeline that works backwards from the submission date, based on how experienced bid teams organise themselves.
Plan backwards from the deadline
Start with the submission deadline and mark the fixed points on a calendar: the question deadline, any site visit, the dates you need internal approval, and the day you will upload the bid. Aim to finish two working days before the deadline. Those two days are your reserve for the things that always go wrong: a late signature, a portal that rejects a file, a guarantee that arrives with a typo.
Week 1: understand and organise
- Make the bid decision formally and write down why. Our bid or no-bid checklist helps.
- Name a bid manager and owners for the technical, commercial and legal parts.
- Split the documents into a compliance matrix: every "shall", every form, every requested document, with an owner and a due date.
- Register on the tender platform and check that the right people receive the clarification answers.
- Send the first supplier enquiries for long-lead and high-value items: power transformers, high-voltage switchgear (GIS or AIS), protection and control, cables, steel towers. Lead times for this equipment can be long, and a bid without firm quotes is a gamble.
Week 2: questions and site
- Visit the site if a visit is offered, even when it is optional. Look at access roads, space for storage and cranes, existing equipment, and where outages will be needed.
- Send your questions well before the question deadline. Group them, quote the document and clause, and suggest an answer, for example: "Please confirm that type test reports to IEC 62271-200 for the medium-voltage switchgear from any accredited laboratory are acceptable."
- Arrange the bid guarantee with your bank now; it can take a week or more, especially if the wording is prescribed.
- Confirm partners and subcontractors for civil works, cable laying or testing, and agree who provides which references.
Weeks 3 and 4: engineering and pricing
- Prepare the technical solution: single-line diagram, layout, equipment data sheets, compliance with the employer's requirements, and deviations if any are allowed.
- Build the programme: design, approvals, manufacturing, delivery, installation, outages, testing and commissioning. Check it against the required completion date and the delay penalties.
- Price the work: equipment from supplier quotes, installation from your own productivity data, and a clear list of risks with a value against each. Keep currency, metal price and inflation assumptions visible.
- Review the contract terms: liability caps, penalties, payment milestones, warranty, and what happens if the employer's outage plan changes.
Week 5: review and approve
- Hold a red-team review. Someone who did not write the bid reads it as the evaluator would, against the award criteria and their weightings.
- Check compliance line by line against the matrix from week 1. Missing forms and unsigned declarations are among the most common reasons good bids are rejected.
- Get internal approval for price, risk and margin from the people who can give it.
- Prepare signatures: powers of attorney, company stamps where required, and electronic signatures of the kind the platform or the buyer requires.
Week 6: submit early
- Upload a day or two before the deadline. Portals slow down near deadlines, and some limit file sizes or file types.
- Check what you uploaded: open every file from the portal, not from your own folder.
- Keep the receipt the portal issues, with the time stamp.
- Hold your supplier quotes open for at least the bid validity period, or agree how prices will be confirmed.
The mistakes that disqualify good bids
- Uploading after the deadline, even by a minute.
- A bid guarantee with the wrong amount, beneficiary, validity or wording.
- Missing a mandatory form, declaration or signature.
- Conditions or deviations in the price schedule when none are allowed.
- References that don't match the required type or size, or can't be verified.
- Using an old version of a form, instead of the one issued with the latest clarification.
- Arithmetic errors in the price schedule that the buyer corrects against you.
After submission
Keep the bid team's knowledge together: evaluators may ask for clarifications, and some procedures include negotiations or a best and final offer. When the result comes, ask for a debriefing whether you won or lost. The bid or no-bid checklist explains how to use those results for your next decision.