History
A brief historic introduction
Following the Framework Guidelines on Electricity System Operation, four network codes were initially developed:
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Network Code on Operational Security
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Network Code on Operational Planning and Scheduling
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Network Code on Load-frequency Control and Reserves
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Network Code on Emergency and Restoration
During the adoption process led by the European Commission, the Network Codes on Operational Security, Operational Planning and Scheduling and Load-frequency Control and Reserves were merged into the Guideline on Electricity Transmission System Operation.