Common use of Rules & Methodologies Clause in Contracts

Rules & Methodologies. 4.4.1 Requirements concerning the availability, reliability and redundancy of the technical infrastructure Technical infrastructure that is required for the processes referred to in the process activation structure (see section 4.2.1) include: • Digital control systems such as o SCADA/LFC systems o Information systems like the Nordic Operation Information System (NOIS) and o Telephone/messaging systems • Communication links between the Digital control systems of the Nordic TSOs. 4.4.1.1 Availability, reliability and redundancy of Digital control systems for frequency containment process and frequency restoration process Digital control systems required for frequency containment process and frequency restoration process have to be available seven (7) days a week and twenty-four (24) hours per day during the whole year. The TSOs shall ensure that the functions in these systems that are related to the frequency containment process and frequency restoration process run with a minimum of interruptions twenty-four (24) hours per day through the year. The hardware and software architecture and application design of the Digital control systems required for frequency containment process and frequency SOGL 143(4) SOGL 145(6) SOGL 151(2)-(3) SOGL 151(1) SOGL 151(2)(b) restoration process shall be such that normal daily and monthly maintenance does not require system shutdowns and system can be used uninterruptedly. However, during planned maintenance, for example in major hardware or software upgrades, downtime less than 1−2 hours can still be considered acceptable not more than once per month. 4.4.1.2 Availability, reliability and redundancy of Communication links between SOGL 151(2)(b) Digital control systems for frequency containment process and frequency restoration process The communication lines between the Nordic TSOs and between the Nordic TSOs and other European TSOs are part of the so-called Electronic Highway (EH). The availability and redundancy of the EH are described on a European level. SOGL 151(2)(c) 4.4.1.3 Communication protocols SOGL 151(2)(d) Communication protocols that are used between the Nordic TSOs are ICCP, Elcom and Tase 2.

Rules & Methodologies. 4.4.1 Requirements concerning the availability, reliability and redundancy of the technical infrastructure Technical infrastructure that is required for the processes referred to in the process activation structure (see section 4.2.1) include: • Digital control systems such as o SCADA/LFC systems systems; o Information systems like the Nordic Operation Information System (NOIS) ); and o Telephone/messaging systems systems. • Communication links between the Digital control systems of the Nordic TSOs. 4.4.1.1 Availability, reliability and redundancy of Digital control systems for frequency containment process and frequency restoration process Digital control systems required for frequency containment process and frequency restoration process have to be available seven (7) days a week and twenty-four (24) hours per day during the whole year. The TSOs shall ensure that the functions in these systems that are related to the frequency containment process and frequency restoration process run with a minimum of interruptions twenty-four (24) hours per day through the year. The hardware and software architecture and application design of the Digital control systems required for frequency containment process and frequency SOGL 143(4) SOGL 145(6) SOGL 151(2)-(3) SOGL 151(1) SOGL 151(2)(b) restoration process shall be such that normal daily and monthly maintenance does not require system shutdowns and system can be used uninterruptedly. However, during planned maintenance, for example in major hardware or software upgrades, downtime less than 1−2 hours can still be considered acceptable not more than once per month.) 4.4.1.2 Availability, reliability and redundancy of Communication links between SOGL 151(2)(b) Digital control systems for frequency containment process and frequency restoration process The communication lines between the Nordic TSOs and between the Nordic TSOs and other European TSOs are part of the so-called Electronic Highway (EH). The availability and redundancy of the EH are described on a European level. SOGL 151(2)(c) ) 4.4.1.3 Communication protocols SOGL 151(2)(d) Communication protocols that are used between the Nordic TSOs are ICCP, Elcom and Tase 2.