How to Become a Supplier to National Grid in Great Britain

Supplier onboarding at National Grid in Great Britain runs through its supplier portal, which now runs on Ariba Supplier Lifecycle Performance and works alongside its Coupa platform. You also get your company onto the Achilles Utilities Vendor Database, which National Grid uses to build its shortlists. For high-risk categories, it requires an Achilles Verify assessment of your health and safety, quality and environmental capability (National Grid new suppliers page).

Grid upgrade work in Great Britain is bought by a tiny group: 3 transmission owners, the long frameworks they award, and the tier 1 contractors who own each construction package. For most specialist suppliers in civils, surveys, environmental work or installation, the realistic first job is a subcontract lot. The person who controls that lot is usually a package manager or project director at a contractor.

So the real question is which of three routes fits your company: direct onboarding with a transmission owner, a framework position, or package-level subcontracting. The decision rules below sort that out.

What does National Grid's onboarding actually give you?

National Grid describes Ariba SLP as the system it uses for onboarding, qualifying, segmenting and managing suppliers (National Grid suppliers page). Read those verbs carefully. Qualifying and segmenting happen after you are in the system, and they decide whether a buyer ever sees your name.

The practical sequence:

1. Download the commodity list from National Grid's new suppliers page and find the category you actually deliver. The list comes with procurement contact details.
2. Register on Achilles UVDB, because the shortlists are drawn from it.
3. If your category is classed as high-risk, complete Achilles Verify before a buyer has to ask for it.
4. Onboard through Ariba SLP, and read the Supplier Code of Conduct and the Sustainability Policy, which National Grid expects its suppliers to support.

Being registered and being chosen are different states. National Grid's UK pages do not spell this out, but its supplier guidance for its US business does: registration is the first step, it does not guarantee eligibility or enrollment, and enrollment is required before a purchase order can be issued (National Grid supplier registration guidance). Registration says you exist. A purchase order comes only after a buyer has a specific requirement and decides you fit it. Treat the portal as a hygiene step you finish once.

The wider rules sit in the Procurement Act 2023, which National Grid names as the law its sourcing must follow. The Act covers utilities contracts, frameworks and dynamic markets. It also sets out grounds for excluding suppliers and a system of notices, such as planned procurement notices, preliminary market engagement notices and contract award notices. Section 12 requires buyers to have regard to the barriers SMEs may face in taking part (Procurement Act 2023).

For a supplier, the useful part is the notices. A preliminary market engagement notice signals that a buyer is talking to the market before it fixes a requirement, and that is the moment to be in the conversation. This is not legal advice.

Who are the real buyers for Great Britain's grid upgrade?

Onshore electricity transmission in Great Britain has three owners. Ofgem's RIIO-3 final determinations publish a separate document for each of them (Ofgem RIIO-3 final determinations), and most new substations, overhead lines and underground cable routes in the upgrade end up belonging to one of them.

National Grid's portal covers National Grid. Being onboarded there does nothing for a job north of the border, and the two Scottish owners run their own supplier processes. If your crews are based in Inverness, the first registration that matters is not the one most articles describe.

All three work inside the same price control. RIIO-3 is a five-year control starting 1 April 2026 and ending 31 March 2031. For a supplier, RIIO-3 is the window in which this round of transmission spending is planned, so it is the calendar your own pipeline should follow.

Now count the buyers. There are 3 owners. Beneath them is a limited set of tier 1 contractors per region, plus the framework holders covered further down.

The people who can actually award you work fit on one page. That kills the habit some suppliers bring from public-sector tendering: scan every notice, bid on everything. Here, a mapped list of named companies, territories and people beats volume of bids.

My rule for any narrow market is one offer to one audience, held for 12 months. In this market that means one transmission owner's area and one category you can prove, rather than "grid services across the UK."

What changed with ASTI and the 26 projects?

In December 2022, Ofgem introduced the Accelerated Strategic Transmission Investment framework, ASTI for short. The decision set out the initial list of projects, exempted these strategic projects from competition and created a new process for assessing and funding them. The context was the goal of connecting up to 50GW of offshore generation by 2030 (Ofgem ASTI decision).

In May 2026, Ofgem said every one of the 26 ASTI projects now had early construction funding. Transmission owners use that money to buy scarce items like HVDC cables and substation components ahead of time, and to pay for strategic land, surveys, design and the first enabling works on site (Ofgem early construction funding announcement).

Two things follow for a supplier.

Funding is not consent. Ofgem said plainly that the decision is not planning consent for the schemes. A project can have money for components while its route and substations are still in planning, so the procurement calendar and the planning calendar need to be tracked separately.

Demand also arrives in stages, and each stage has a different buyer:

1. Land, surveys and consents: ground investigation, ecology, archaeology and land referencing that feed the planning work.
2. Enabling works: access roads, compounds and early civils, often let ahead of the main packages.
3. Main construction packages: substation civils, cable route works and overhead line works, let to tier 1 contractors who subcontract parts of them.
4. Major plant and cable: substation components such as transformers and switchgear, plus HVDC cable and converters. These are the scarce items early funding pays to order ahead of time, so the owner's buying decision can come years before installation.

For a survey or environmental firm, ASTI is mostly a stage 1 and 2 story, and the buyers are whoever runs consent and enabling work on each project. Early funding explicitly covers surveys and design work, so that demand is already paid for. For a specialist installer, it is a stage 3 story, and the contractor who will let the lot may not even be appointed yet.

Which National Grid HVDC framework suppliers matter first?

On 13 March 2025, National Grid announced it had awarded two parts of a £59 billion HVDC supply chain framework. The two lots below come to about £45.9 billion, so check the status of the rest of the framework before you assume there is nothing left to bid for. Positions run for five years, with the potential for three more (National Grid HVDC framework announcement).

That is 10 suppliers across two lots, in place for up to eight years. It is the clearest picture of how this market buys: a few large, long relationships, with work flowing down from each one.

First work out which side you are on. Cable-side work sits around the cable itself: jointing, terminations, pulling, testing, route civils and logistics. Converter-side work sits around a station: civils, buildings, building services and installation support.

If you are not a cable maker or a converter manufacturer, you cannot bid for this framework today. Use it as a target list. Each of those 10 suppliers needs site services, testing, logistics and civils around its scope. Its supply chain team is a much shorter path than waiting years for the next round.

Do you sell to the transmission owner or to a tier 1 contractor?

Here are the decision rules I would hand any specialist supplier looking at this market:

1. Go direct to the transmission owner if you deliver a category on its commodity list at its scale, with UVDB in place and Verify done if your category needs it. Your buyers are the category manager and the supply chain manager for that category.
2. Aim for a framework if you make or deliver the major plant or long-term services that owners and framework holders buy over many years. The HVDC cable and converter lots are awarded, so in those categories this is a plan for the next round.
3. Go to the package owner if neither applies. Target the person at the tier 1 contractor who controls the next subcontract lot on a project in your chosen territory.

Most specialist firms land on rule 3, and that is a good place to start. A delivered subcontract package on a transmission project is exactly the proof that makes rules 1 and 2 realistic later. The same discipline applies to your own pipeline: qualify before the calendar fills with calls that can never turn into a lot.

Before I build any target list, I go back through a company's past projects and find out who actually made each decision. In package work, check whether it was the project director who chose the contractor or the package manager who let the lot.

I also never put a generic "manager" title on a list, because every niche has its own real titles. In this market they split by buyer type:

Worked example for a specialist environmental firm

Take a hypothetical ecology and survey firm based in the north of Scotland, 40 staff, with protected species work on road and rail schemes behind it.

The wasted version goes like this. The firm registers with all three owners and sends a capability brochure to a general procurement inbox and the head of supply chain at National Grid. Its crews could not even reach most of National Grid's projects. Nothing comes back, and the founder concludes grid work is a closed shop.

The better version picks one territory: ASTI projects in the Scottish Hydro Electric Transmission area, where the crews already are. It picks stage 1 and 2 work, and only on projects where that stage is still open.

It finds the lead environmental consultants and the contractors holding enabling works on those projects. Inside each one it names the package manager and the technical lead on consents. Then it puts two comparable linear schemes in the first message, with species, length and outcome. Registration with SSEN Transmission happens in parallel, as housekeeping.

A substation civils firm follows the same logic with different names. It picks one owner's area, finds the tier 1 contractors holding substation packages there, and goes to the package manager and construction manager, never to a generic procurement address.

What proof do grid buyers want inside the first message?

My team writes past clients, results and case studies into the first message rather than holding them back for a call. In grid work this matters more than usual, because the buyer is managing risk. A late subcontractor delays a whole project, the wrong technical competence fails inspection, and an unsafe crew stops a site.

Proof that answers those three risks beats any adjective. "Experienced team delivering safe, high-quality solutions" says nothing. A line like "civils for a 132kV substation, energised last year, delivered for a tier 1 contractor" answers the question before it is asked.

The package-ready proof checklist:

1. Energised substations. Name the voltage, the type of client, your exact scope, and that the site is energised, because energised means the work passed commissioning.
2. Cable jobs of similar scope. Give the route length, the voltage, the ground conditions and which part you delivered.
3. Accreditations. Your UVDB listing, your Verify result where it applies, and certificates covering health and safety, quality and environment.
4. Delivery record. Finished on schedule, with the main contractor named if you have permission.
5. Territory fit. State which owner's area your crews work in, so the buyer knows you are local to their project.

If your strongest project is still small, do not fill the gap with free custom work. I learned the hard way that unpaid work built for one prospect rarely buys trust, while proof built once and shown to everyone keeps working.

How should suppliers approach a market this small?

I skip intent data when the market is this small. With 3 owners, 10 HVDC framework holders and a limited set of tier 1 contractors, intent signals on a few of them tell you almost nothing. What works is an offer that matters to every account in that small group.

I divide territories account by account, so no two people on a team ever reach the same contact. Here, split by owner area or by project. One person owns a contractor across all its projects, or one project across all its contractors, never both. When you build the lead list, tag every contact with owner area, project and owner on your side before a single message goes out.

Stage the outreach in this order:

1. Contractors you already supply in any scope, because I always start from current and past clients and then look for lookalikes.
2. Adjacent contractors working on the same projects as those clients.
3. Specialist subcontractors and lead consultants who hire specialists like you.

Then plan for a long cycle. In my campaigns, first calls can come inside 30 days, yet the deals behind them may close 4 or more months later, and 6, 9 or 12 month B2B cycles are common. A grid package can take longer again, because it waits on the project stage.

Run LinkedIn and email as one outreach sequence so a package manager who ignores one channel still sees you on the other.

Does a tier 1 package team read cold outreach? In my experience they do, if the message names the package and asks for a short conversation. The same small-market logic applies on the Irish network, which I cover in how to sell to ESB Networks and EirGrid.

What is the simplest supplier-entry checklist?

1. Write down every contractor and utility you have delivered for, in any scope, with the person who signed off each job. It is the same starting point as picking a market first.
2. Pick one owner's area and one category you can prove, and choose your route with the three rules above.
3. Register with that owner's supplier process and Achilles UVDB, and complete Verify if your category needs it.
4. Write up the proof pack from the section above: two or three projects, with numbers.
5. List the projects and contractors in your area and assign each one to a single owner on your team.
6. Name the target roles per account: package manager, project director, construction manager, supply chain manager.

Steps 1 to 4 are mostly one-off work. Steps 5 and 6 are the ones you repeat for every new project in your area.

If you are trying to find the right package owner on a grid project, I can help you think it through on a call.