[CWE FB MC DA] SPAIC publication - IMPACT ASSESSMENT FOR THE PLANNED OUTAGE OF TWO BELGIAN 380 KV INTERNAL ELIA LINES

Dear Market Participants,

Elia plans subsequent grid reinforcement on the two 380 kV lines between Mercator and Horta substations. The goal of these outages is to upgrade the capacity of the line with AMS conductors with high-performance HTLS conductors. One of both lines will remain in operation at any point in time, while the capacity of the line in outage is reduced to 0MW.

The outage of one of the two lines is planned as follows:

· Mercator Horta N.1 outage will start on 08/04/2019 and is expected to end on 25/04/2019.

· The capacity of the line Mercator Horta N.1 will be doubled thanks to the new AMS conductors as of 25/04/2019.

· Mercator Horta N.2 outage will start on 29/04/2019 and is expected to end on 16/08/2019.

· The capacity of the line Mercator Horta N.2 will be doubled thanks to the new AMS conductors as of 16/08/2019

The most recent information regarding the outage period can be retrieved from the ENTSO-E Transparency website (https://transparency.entsoe.eu/).

Following the continuous effort for enhanced transparency at CWE, ELIA has performed a SPAIC analysis. SPAIC stands for Standard Procedure for Assessing the Impact of Changes and consists of a comparison of the CWE flow-based domains for 12 typical “reference” days, commonly predefined by CWE TSOs, in order to estimate the impact of a change in grid topology or flow-based parameters in the CWE Area.

The enclosed documents provide the results of the performed SPAIC analysis for the reference period.

Best Regards,

ELIA