Existing suppliers

The following information only applies if you are a supplier to National Grid and have a National Grid vendor number. 

You are already one of our valued suppliers and you have a relationship with our procurement team. What you need to know…


Changes to the National Grid Coupa system

We have contacted our existing suppliers to notify you of the changes to our Coupa system that are happening in July 2021.

Take a look at our 'Frequently asked questions for suppliers' document to find out more.

Download the FAQs 


What is Coupa and what do you need it for?

Coupa is a free, cloud-based purchase to pay system that will enable you, as a National Grid supplier, to conduct commercial transactions more efficiently. It will help to reduce costs and provide better value for money for both you and National Grid.

The part of Coupa you will use is called the Coupa Supplier Portal. This online collaborative procurement system will allow you to receive and acknowledge purchase orders electronically, submit invoices and view payments, receive and respond to requests for quotes, and maintain electronic catalogues.

Why use the Coupa Supplier Portal (CSP)?

Coupa will innovate and simplify some of our processes, making it easier for you to work with us. The main benefits the system brings are:

  • Free to use – there is no fee for registering with or using the Coupa Supplier Portal
  • More efficient payments – simply flip your purchase orders to invoices to go straight for payment
  • Improved visibility – you can view all your purchase orders and invoices, as well as the date when your invoices are due for payment
  • Effective communication – Coupa and the CSP allows you to communicate efficiently with National Grid requisitioners by adding your comments directly on purchase orders and invoices. If you are not registered to the CSP you can also use this feature directly on the Supplier Actionable Notification (SAN) email you will receive each time we release a new PO.
  • Easy to access – the Coupa Supplier Portal is a cloud-based platform so you can access it from any device, anywhere in the world.

Coupa Supplier Portal (CSP) registration it's free

If you are a supplier who has never collaborated with National Grid, you will first need to complete a supplier application before you can register to CSP.
Find out how you can work with us.

It’s quick and easy to sign up to the Coupa Supplier Portal. Below you can find the steps you need to follow if you are new to Coupa or if you have previously registered to the CSP with another customer.

Signing up to Coupa

Follow the four steps below to register:

  1. Navigate to the Coupa supplier portal  
  2. Complete the fields in the Registration box and click 'Register'
  3. You will receive an email to verify your email address. Click on the link in the email and create a password for your CSP account
  4. Email your CSP account details to [email protected] – this will allow us to link your account

Please ensure that you include your: 

  • vendor number
  • company name (used for CSP registration)
  • primary contact name (used for CSP registration)
  • email address (used for CSP registration)

Please make sure you complete all steps, otherwise we will not be able to link your account.

Have a look at our CSP Registration Guide, which shows the steps above in more detail.

Before you register, please note the following:
  1. If you already have a Coupa Supplier Portal Account with another customer, other than National Grid, please simply email us your account details. You do not need another Coupa Supplier Portal account so you do not need to register again.
  2. We can link only one supplier account to the Coupa Supplier PortalFor example, if different parts of your business supply goods/services to National Grid and they each have separate supplier accounts with us, we need to work with you to make sure we setup your accounts correctly. Coupa Supplier Portal accounts can be set up to be shared accounts where everyone can see everything or locked accounts, so the Coupa Supplier Portal account is shared, but you do not see each other’s transactions. If multiple people within your organisation need to register on the Coupa Supplier Portal, please get in touch with us by emailing [email protected].

How will you receive purchase orders?

Registered Suppliers

  • You will receive Coupa-released purchase orders (POs) by email – here you can click on the View Order button, which will direct you to the Coupa Supplier Portal.
  • You can then log in to view the PO, flip (prepopulate) it into an invoice and submit it for payment.

Unregistered Suppliers

  • You will receive Coupa released POs by email – these are called Supplier Actionable Notifications (SAN). Please note that if we don’t have a valid email address for you, we will issue the PO via post. 
  • In the email, you will find the following buttons, which allow you to:
    • create an invoice – click this button to open a new screen where you can invoice National Grid directly for the stated purchase order
    • acknowledge a PO – click this button to notify National Grid that you received the order
    • add a comment – send comments about this PO to the National Grid buyer.

How should you be invoicing us?

All new POs are produced in Coupa and identifiable by a new PO number starting with 34.

If you are registered to the Coupa Supplier Portal, you can simply flip POs into invoices and submit for payment directly on the portal. 

If you are not registered to the Coupa Supplier Portal, please refer to the section above to create an invoice from the PO email you receive from us, using the Create Invoice button, and submit it to National Grid directly.

What to do if your records need updating

The name of a supplier's CSP account will need to match the name we have for you in our main records. 

If you believe your main records need updating, please contact [email protected], referencing your vendor number and the required changes.

Our vendor team will then get in touch to validate and advise of any next steps as appropriate.

Frequently Asked Questions

We have created a number of guides and training videos to help suppliers with setting up and then using their Coupa account.

Please click on the relevant links below to find out more.

Introduction to Coupa CSP femonstration
Enriching company profile  Submitting invoices 
Registering to use  Inviting additional users to CSP
Setting up eInvoicing  Reporting
Viewing invoices  Viewing purchase orders 
Maintaining catalogues  Glossary 
Frequently Asked Questions CSP Supplier Guide 


If you have any questions, please contact the Supplier Enablement team at [email protected].