How to prepare for a blackout? ČEPS to launch new “SOS” service

ČEPS has opened a public consultation on the introduction of a new ancillary service called System Restoration Capability (SOS). The consultation concerns proposed amendments to the Transmission System Operation Rules, specifically the Transmission System Code – Part II and the Transmission System Code – Part V. Comments may be submitted from 23 April to 24 May 2026, with ČEPS explicitly stating that the consultation covers only the changes highlighted in yellow in the relevant documents.

From a technical perspective, this is not a minor adjustment to the terminology of ancillary services. The Transmission System Code defines the rules for connecting to and using the transmission system, the conditions for providing ancillary services, and other operational arrangements necessary for the system’s security and reliability. Part II of the Code deals with ancillary services, their technical functions, conditions for provision, certification and procurement rules. Part V describes, among other things, the system defence plan and restoration plan—that is, the strategy, priorities and responsibilities for restoration following a system disturbance such as a blackout.