System Operations

The System Operation specifies what transmission system operators should do in managing their grid. The fact that the generation mix in Europe is integrating more and more renewables, that there is more and more interconnections and cross-border competition has been considered in the System Operation Guideline. It lays the ground for the next power system and for example makes regional coordination a legal obligation for grid operators.

Current Status
Entered into force
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Published Regulation

The published network codes become regulations. Use this section for a handy way to jump to a particular article of the network code.

COMMISSION REGULATION (EU) 2017/1485

of 2 August 2017

establishing a guideline on electricity transmission system operation

Implementation - Making the code a reality

Implementation Studies

FTI Study - Options for the future of power system regional coordination & Regional Security Coordinators.

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Methodologies

This section contains all TSOs’ proposals and Methodologies as submitted to NRAs for approval

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Annual Reports

Annual reports on incident classification scale, load frequency control and year ahead scenarios

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Latest Updates (11)

Events (14)

SYS Deliverables

A 118.1 Contents of synchronous area operational agreement
Full Title
Contents of synchronous area operational agreement
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
A 118.1 Subject to NRA approval - SAOA
Full Title
Subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
A 118.1 Not subject to NRA approval - SAOA
Full Title
Not subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
A 118.1 Subject to NRA approval - SAOA
Full Title
Subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
A 118.1 Not subject to NRA approval - SAOA
Full Title
Not subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
A 118.1 Subject to NRA approval - SAOA
Full Title
Subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
TSOs proposal deadline
14/09/2018
A 118.1 Not subject to NRA approval - SAOA
Full Title
Not subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
TSOs proposal deadline
14/09/2018
A 118.1 Subject to NRA approval - SAOA
Full Title
Subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
TSOs proposal deadline
14/09/2018
A 118.1 Not subject to NRA approval - SAOA
Full Title
Not subject to NRA approval - SAOA
Responsible
TSOs of SA (synchronous area)
Cluster
Operational agreements
Geographical Scope
TSOs proposal deadline
14/09/2018
A 141.2 Common proposal for the determination of LFC blocks...
Full Title
Common proposal for the determination of LFC blocks
Responsible
TSOs of SA (synchronous area)
Cluster
LFCR
Geographical Scope
A 141.2 Common proposal for the determination of LFC blocks...
Full Title
Common proposal for the determination of LFC blocks
Responsible
TSOs of SA (synchronous area)
Cluster
LFCR
Geographical Scope
NRA amendment request
NRA
TSOs amendment deadline
15/07/2018
NRA approval deadline
9/10/2018
A 141.2 Common proposal for the determination of LFC blocks...
Full Title
Common proposal for the determination of LFC blocks
Responsible
TSOs of SA (synchronous area)
Cluster
LFCR
Geographical Scope
A 141.2 Common proposal for the determination of LFC blocks...
Full Title
Common proposal for the determination of LFC blocks
Responsible
TSOs of SA (synchronous area)
Cluster
LFCR
Geographical Scope
NRA amendment request
NRA
TSOs amendment deadline
27/08/2018
A 141.2 Common proposal for the determination of LFC blocks...
Full Title
Common proposal for the determination of LFC blocks
Responsible
TSOs of SA (synchronous area)
Cluster
LFCR
Geographical Scope
TSOs proposal deadline
14/01/2018
TSOs final submission
12/01/2018
NRA approval deadline
12/07/2018
NRA amendment request
NRA
TSOs amendment deadline
27/08/2018
A 156.11 Methodology for a cost-benefit analysis for assessing the...
Full Title
Methodology for a cost-benefit analysis for assessing the required minimum activation time for FCR in CE and Nordic synchronous areas
Responsible
TSOs of SA (synchronous area)
Cluster
LFCR
Geographical Scope
NRA amendment request
NRA
TSOs amendment deadline
25/11/2018
A 39.3.a Study on minimum required inertia
Full Title
Study on minimum required inertia
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/09/2019
A 39.3.a Study on minimum required inertia
Full Title
Study on minimum required inertia
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/09/2019
A 39.3.a Study on minimum required inertia
Full Title
Study on minimum required inertia
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/09/2019
A 39.3.a Study on minimum required inertia
Full Title
Study on minimum required inertia
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/09/2019
A 39.3.a Study on minimum required inertia
Full Title
Study on minimum required inertia
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/09/2019
A 39.3.b Methodology for the definition of minimum inertia required...
Full Title
Methodology for the definition of minimum inertia required to maintain operational security and to prevent violation of stability limits
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/03/2020
A 39.3.b Methodology for the definition of minimum inertia required...
Full Title
Methodology for the definition of minimum inertia required to maintain operational security and to prevent violation of stability limits
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/03/2020
A 39.3.b Methodology for the definition of minimum inertia required...
Full Title
Methodology for the definition of minimum inertia required to maintain operational security and to prevent violation of stability limits
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/03/2020
A 39.3.b Methodology for the definition of minimum inertia required...
Full Title
Methodology for the definition of minimum inertia required to maintain operational security and to prevent violation of stability limits
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/03/2020
A 39.3.b Methodology for the definition of minimum inertia required...
Full Title
Methodology for the definition of minimum inertia required to maintain operational security and to prevent violation of stability limits
Responsible
TSOs of SA (synchronous area)
Cluster
Dynamic stability
Geographical Scope
TSOs proposal deadline
14/03/2020
A 40.6 Key organisational requirements, roles and responsibilities in relation...
Full Title
Key organisational requirements, roles and responsibilities in relation to data exchange
Responsible
All TSOs
Cluster
Data Exchange
Geographical Scope
NRA amendment request
NRA
TSOs amendment deadline
15/10/2018
NRA approval deadline
15/12/2018
A 65 Common list of year-ahead scenarios against which TSOs...
Full Title
Common list of year-ahead scenarios against which TSOs assess the operation of the interconnected transmission system for the following year
Responsible
All TSOs
Cluster
Year-ahead scenarios
Geographical Scope
TSOs proposal deadline
15/07/2018
A 65 Common list of year-ahead scenarios against which TSOs...
Full Title
Common list of year-ahead scenarios against which TSOs assess the operation of the interconnected transmission system for the following year
Responsible
All TSOs
Cluster
Year-ahead scenarios
Geographical Scope
TSOs proposal deadline
15/05/2019
A 67.1_70.1 Methodology for building the common grid models
Full Title
Methodology for building the common grid models
Responsible
All TSOs
Cluster
Common Grid Model
Geographical Scope
TSOs proposal deadline
14/03/2018
NRA approval deadline
14/09/2018
NRA final approval
21/09/2018
A 75.1 Methodology for coordinating operational security analysis
Full Title
Methodology for coordinating operational security analysis
Responsible
All TSOs
Cluster
Coordinated security analysis
Geographical Scope
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/09/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/09/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 76.1 Common provisions for regional operational security coordination
Full Title
Common provisions for regional operational security coordination
Responsible
TSOs of CCR (capacity calculation region)
Cluster
Regional Coordination
Geographical Scope
TSOs proposal deadline
14/06/2019
A 84.1 Methodology for assessing the relevance of assets for...
Full Title
Methodology for assessing the relevance of assets for outage coordination
Responsible
TSOs of SA (synchronous area)
Cluster
OPC
Geographical Scope

European Stakeholder Committee

History & Development of the network code

View network code development information

The System Operation Guideline is one of the network codes/guidelines drafted under the Third Energy Package. In 2015, the European Commission, ACER and ENTSO-E agreed to merge the three operational network codes into a single System Operation Guideline during their preparatory work for Comitology.

The new guideline is composed of the former network codes on Operational Planning and Scheduling (NC OPS), Operational Security (NC OS), and Load Frequency Control and Reserve (NC LFCR).

On 1 December the European Commission published the version of the Regulation establishing a guideline on electricity transmission system operation that was sent to electricity cross-border committee. The first meeting of the electricity cross-border committee on the System Operation Guideline is scheduled on 11 December 2015.

On 4 May 2016 the Member States gave a favourable opinion on the Draft Regulation establishing a guideline on electricity transmission system operation – the System Operation Guideline.

Download the provisional final version of the text​

Merged Codes

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