Infrastructure
Article 151
1. All TSOs shall assess what technical infrastructure is necessary to implement and operate the processes referred to in Article 140 and considered critical pursuant to the security plan referred to in Article 26. 2. All TSOs of a synchronous area shall specify, in the synchronous area operational agreement, minimum requirements for the availability, reliability and redundancy of the technical infrastructure referred to in paragraph 1 including: (a) the accuracy, resolution, availability and redundancy of active power flow and virtual tie-line measurements; (b) the availability and redundancy of digital control systems; (c) the availability and redundancy of communication infrastructure; and (d) communication protocols. 3. All TSOs of a LFC block shall set out additional requirements for the availability, reliability and redundancy of the technical infrastructure in the LFC block operational agreement. 4. Each TSO of a LFC area shall: (a) ensure a sufficient quality and availability of the FRCE calculation; (b) perform real-time quality monitoring of the FRCE calculation; (c) take action in case of FRCE miscalculation; and (d) where the FRCE is determined by the ACE, perform an ex-post quality monitoring of the FRCE calculation by comparing FRCE to reference values at least on an annual basis.