This section is aimed at providing a general understanding of the Integrated Single Electricity Market (I-SEM), how it operates and project updates.

Trading in the Market

Bidding and pricing

This section details the processes by which SEMO determine which generators are scheduled. It also details how the Pricing element of the market operates and the factor which are included in the calculations.

Credit requirements

Each market participant must have credit cover in place to allow them to trade. View the Credit Cover FAQ for more information.

Money movement

One of the most important aspects of role performed by SEMO is the continuous movement of money in the SEM. This involves calculating the Settlement values, communicating these values to market participants, and insuring the funds reach bank accounts as timetabled.

Market data

SEMO has an information portal which allows stakeholders to access historical SEM information. The output files from the SEMO Market Systems are also made available to all stakeholders.


SEMO maintains open and transparent communications with all stakeholders. Stakeholders can sign up to receive information with regard to specific aspects of the SEM.

IT prerequisites

SEMO utilises advanced software to perform its Market Operator function. Market Participants interact with SEMO via these bespoke IT Systems. In order to communicate with SEMO there are specific requirements which must be met in order for the link to work.