Single Electricity Market (SEM) launched on 1 November 2007

A new electricity market called the Single Electricity Market (SEM) was launched on the first of November 2007. The market involves combining the two wholesale electricity markets of the North and South of Ireland, into one cross-border market. The project involved the input and cooperation of all parties in the electricity industry North and South.

The SEM is the first cross border market of its kind in Europe. With the exception of generators that produce less than 10 MW of electricity, all electricity produced on the island of Ireland now must sold into one large “pool”, with supply companies then buying their power out of this pool.

The market was designed in order to increase competition in the electricity market, reduce energy costs and improve reliability of supply. Further information can be found at

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