Support

Last Updated: 23 October 2026

At a Glance

ℹ Planned Implementation Dates

• 6 April 2027 – Day-ahead auction MTU resolution changes
• 20 April 2027 – Introduction of N2EX Intraday Auctions (N2EX IDA)

✅ Member Actions

• Existing Day-ahead portfolios: No action required
• New N2EX Intraday Auction portfolios: Required
• GB HHA market: Discontinued and replaced by N2EX IDA1

⚠ Key Reminder

• The Day-ahead MTU resolution changes will be implemented before the N2EX Intraday Auctions go-live.

Contents:

• Overview 
• Implementation timeline 
• Day-ahead Auction Changes – multi-resolution 
• Introduction of N2EX Intraday Auctions (N2EX IDA)
• Member preparation
• Portfolio considerations 
• Supported products and order types 
• Production and Member Test access  
• Auction API 
• User Guide 
• Member Testing
• Market and Product Codes in CASS
• Support

Overview

This chapter outlines the next implementation phases of the implicit trading solution on the North Sea Link (NSL) interconnector, planned for implementation in April 2027.

Since 2021, Nord Pool has successfully operated the implicit Day-ahead auction between Great Britain and Norway. Trading will continue to be integrated into Nord Pool’s auctions in Great Britain and Norway with the addition of two new Intraday Auctions (N2EX IDA) and a change of Market Time Units (MTU) in the existing N2EX auction. As such, N2EX trading, and the upcoming N2EX Intraday Auctions will remain outside the common European electricity market.

Implementation Timeline

The following changes will be introduced:

Note: The Day-ahead resolution changes will be implemented prior to the go-live of the N2EX Intraday Auctions.

Day‑ahead Auction Changes – multi-resolution
  

The Day-ahead auctions will move to multi-resolution trading:

• Great Britain (N2EX): Introduction of 30-minute MTU in addition to the existing 60-minute products
• Norway (NO2): Introduction of 15-minute MTU and 30-minute products in addition to the existing 60-minute products
• NSL Interconnector: Resolution will change to 30-minute MTU 
• Gate Closure Times (GCT): No changes for N2EX or NO2 auctions 

Introduction of N2EX Intraday Auctions (N2EX IDA)
 

N2EX Intraday Auctions will be introduced with NSL capacity:

• NSL Capacity: Offered with 30-minute MTU 
• Trading Resolution: Single resolution per market: 
  • Great Britain (GB): 30-minute MTU 
  • Norway (NO2): 15-minute MTU 
• Gate Closure Times (CET): 

Note: The existing GB Half-Hourly Intraday Auction will be replaced with N2EX IDA1

Member Preparation

Participants should prepare for the following:

• Support for new MTU resolutions 
• New Auction Product IDs
• New Market and Product codes in CASS
• Creation of new portfolios in the N2EX Intraday Auction 
• Discontinuation of the GB Half-Hourly Intraday Auction (GB HHA) market
• Members with existing access to the GB Half-Hourly Intraday Auction (GB HHA) market will be given access to the N2EX IDA1 Intraday Auction (through new portfolios)

Portfolio Considerations

• Portfolios in the Auction platform support all MTU resolutions and can be used across auctions. No action is required for existing Day-ahead portfolios.  However:
  • Curve orders can only be submitted with one resolution per bidding zone per auction per portfolio. 
  • If multiple curve orders with different resolutions are required within the same bidding zone and auction, additional portfolios must be requested. 
  • Block orders can only be submitted with one resolution per bidding zone per auction per portfolio.
  • Exclusive group orders can only be submitted with one resolution per bidding zone per auction per portfolio.
• For N2EX Intraday Auctions, new portfolios are required, as this is a new market.
• GB HHA portfolios will be discontinued (no action needed from users)

Supported Products and Order Types

Products available in Production and Member Test environments are aligned.

The platform supports the following order types: curve orders, block orders (including profile, linked and spread blocks), and exclusive group orders. These can be submitted directly through the web platform, uploaded via Excel sheets or via the Auction API.

• Curve orders (hourly orders): One curve order is permitted in each area per portfolio. Further details are provided in the relevant documentation here.
• Block orders: Supported types include regular block orders, profile blocks, linked blocks and spread blocks. These are described in the relevant documentation here.
• Exclusive group orders: Described in the relevant documentation here. 

NOTE: Always refer to the Product Specifications on the Nord Pool website under Rules and Regulations for most up-to-date information on order types, portfolio restrictions and order limits per market.

The updated Product Specification specific to the N2EX market will be published when available and announced separately.

Production and Member Test Access

•  System Links available here - Access to the Production and Member Test environments. 

Accessing the Auction Platform

To begin using the auction, please follow these steps:

1. Ensure your user account is enabled for the auction (contact Support if you need access).
2. Access the platform via the system links in this section.
3. Log in using your existing Auction platform credentials. (refer here for login help).
4. Submit orders as required. Additional details are available in the User Guide in the section below.

Auction API

Nord Pool provides a REST JSON API for accessing the Auction platform:

• Available for the N2EX Day-ahead Auction
• The Auction API will fully support the new MTU resolutions and the introduction of the N2EX Intraday Auctions.
• Documentation can be found in our API Developer Portal here.
   

The updates specific to the N2EX market in the API documentation can be found in our API Portal here: Auction API - Submit and modify orders

User Guide

• The full user guide is here: Auction User Guide

Member Testing

Member Testing has already begun in Nord Pool’s Member Test Environment (MT) since August 2026 using the “TEST_” auctions below which are automatically executed daily:

• Test_N2EX_DA_3 – added in Auction Platform in MT on 11 August 2026  
• Test_N2EX_IDA_1 – added in Auction Platform in MT on 27 August 2026  
• Test_N2EX_IDA_2 – added in Auction Platform in MT on 28 August 2026  

Nord Pool will announce when the remaining auction will be introduced in the Test Environment. These auctions listed below are manually executed only in exceptional cases. For example, when coordinated Member Testing is conducted to simulate specific operational scenarios*.

• N2EX_DA_3 - added in Auction Platform in MT on 30 June 2026
• N2EX_IDA_1 – will be announced separately when available in MT
• N2EX_IDA_2 – will be announced separately when available in MT

* Nord Pool will announce when coordinated Member Testing will be arranged for Market Participants.

The following auctions are available in the Member Test environment.

Market and Product Codes in CASS

In Nord Pool’s Clearing and Settlement System (CASS) there are Market and Product codes that are mapped to each auction. For the existing N2EX auction then these codes will remain unchanged. For the new N2EX IDAs, then new Market and Product code will be introduced.

The Table below shows the mapping of Auction to CASS Market and Product Codes in Production:

Note: In the test environment, then the Product ID, Market Code and Product Codes in the table above will be prefixed with “TEST_”

Note: The existing GB Half-Hourly Auction code (GB_HH_1) and the CASS Market code (NPGBHHA) will be discontinued and will only be available for retrieval of historical data.

Support

If you have any questions, please contact your Nord Pool market manager or support@nordpoolgroup.com