All TSOs' proposal for a common grid model methodology in accordance with Articles
67(1) and 70(1) of Commission Regulation (EU) 2017/1485 of 02 August 2017 establishing
a guideline on electricity transmission system operation, d.d. 12 februari 2018 (zoals
bedoeld in artikel 9.28, onderdeel b).
-
(1) This document is a common proposal developed by all Transmission System Operators
(hereafter referred to as ‘TSOs’) regarding the development of a proposal for a common
grid model methodology (hereafter referred to as ‘CGMM’).
-
(2) This proposal (hereafter referred to as the ‘CGMM Proposal’) takes into account the
general principles and goals set in Commission Regulation (EU) 2017/1485 of 02 August
2017 establishing a guideline on electricity transmission system operation (hereafter
referred to as ‘Regulation 2017/1485’) as well as Regulation (EC) No 714/2009 of the
European Parliament and of the Council of 13 July 2009 on conditions for access to
the network for cross-border exchanges in electricity (hereafter referred to as ‘Regulation
(EC) No 714/2009’). The goal of Regulation 2017/1485 is to lay down detailed guidelines
on requirements and principles concerning system operation with the aim of ensuring
the safe operation of the interconnected system. To facilitate this aim, it is necessary
for all TSOs to use a common grid model. A common grid model can only be created on
the basis of a common methodology for building such a model.
-
(3) Article 17 of Commission Regulation (EU) 2015/1222 of 24 July 2015 establishing a
guideline on capacity allocation and congestion management (hereafter referred to
as ‘Regulation 2015/1222’) is referred to in Article 67(1) and Article 70(1) of Regulation
2017/1485 and defines several specific requirements that the CGMM Proposal should
take into account:
-
(4) Article 67(1) of Regulation 2017/1485 constitutes the legal basis for the proposal
for a common grid model methodology as far as year-ahead common grid models are concerned
and sets out several additional requirements:
‘By 6 months after entry into force of this Regulation, all TSOs shall jointly develop
a proposal for the methodology for building the year-ahead common grid models from
the individual grid models established in accordance with Article 66(1) and for saving
them. The methodology shall take into account, and complement where necessary, the
operational conditions of the common grid model methodology developed in accordance
with Article 17 of Regulation (EU) 2015/1222 and Article 18 of Regulation (EU) 2016/1719,
as regards the following elements:
-
(a)
deadlines for gathering the year-ahead individual grid models, for merging them into
a common grid model and for saving the individual and common grid models;
-
(b)
quality control of the individual and common grid models to be implemented in order
to ensure their completeness and consistency; and (1) and 70(1) of Commission Regulation
(EU) 2017/1485 of 02 August 2017 establishing
-
(c)
correction and improvement of individual and common grid models, implementing at least
the quality controls referred to in point (b).’
-
(5) Article 70(1) of Regulation 2017/1485 constitutes the legal basis for the proposal
for a common grid model methodology as far as day-ahead and intraday common grid models
are concerned and contains the following additional requirements:
‘By 6 months after entry into force of this Regulation, all TSOs shall jointly develop
a proposal for the methodology for building the day-ahead and intraday common grid
models from the individual grid models and for saving them. That methodology shall
take into account, and complement where necessary, the operational conditions of the
common grid model methodology developed in accordance with Article 17 of Regulation
(EU) 2015/1222, as regards the following elements:
-
(a)
definition of timestamps;
-
(b)
deadlines for gathering the individual grid models, for merging them into a common
grid model and for saving individual and common grid models. The deadlines shall be
compatible with the regional processes established for preparing and activating remedial
actions;
-
(c)
quality control of individual grid models and the common grid model to be implemented
to ensure their completeness and consistency;
-
(d)
correction and improvement of individual and common grid models, implementing at least
the quality controls referred to in point (c); and
-
(e)
handling additional information related to operational arrangements, such as protection
setpoints or system protection schemes, single line diagrams and configuration of
substations in order to manage operational security.’
-
(6) Whereas the CGMM pursuant to Regulation 2015/1222 aims at establishing a CGM for the
purpose of calculating capacity for the day-ahead and intraday capacity calculation
time frames and the CGMM pursuant to Commission Regulation (EU) 2016/1719 of 26 September
2016 establishing a guideline on forward capacity allocation aims at establishing
a CGM for the purpose of calculating long-term capacity, the present CGMM Proposal
addresses the building of CGMs for various system operation processes. Since the methodologies
required by Article 67(1) and Article 70(1), respectively, referred to above are inherently
linked, for the sake of efficiency this CGMM Proposal is a joint proposal for both
methodologies.
-
(7) Article 2(2) of Regulation 2015/1222 defines the common grid model as:
‘a Union-wide data set agreed between various TSOs describing the main characteristic
(sic) of the power system (generation, loads and grid topology) and rules for changing
these characteristics during the capacity calculation process’
-
(8) Article 2(4) of Regulation 2015/1222 defines a scenario as:
‘the forecasted status of the power system for a given time-frame’
-
(9) Article 2(1) of Regulation 2015/1222 defines an individual grid model as:
‘a data set describing power system characteristics (generation, load and grid topology)
and related rules to change these characteristics during capacity calculation, prepared
by the responsible TSOs, to be merged with other individual grid model components
in order to create the common grid model’
-
(10) The requirements set out in Article 17 are spelt out in more detail in Articles 18
and 19 of Regulation 2015/1222. Article 18 on scenarios outlines the following:
-
‘1.
All TSOs shall jointly develop common scenarios for each capacity calculation time-frame
referred to in Article 14(1)(a) and (b). The common scenarios shall be used to describe
a (1) and 70(1) of Commission Regulation (EU) 2017/1485 of 02 August 2017 establishing
specific forecast situation for generation, load and grid topology for the transmission
system in the common grid model.
-
2.
One scenario per market time unit shall be developed both for the day-ahead and the
intraday capacity calculation time-frames.
-
3.
For each scenario, all TSOs shall jointly draw up common rules for determining the
net position in each bidding zone and the flow for each direct current line. These
common rules shall be based on the best forecast of the net position for each bidding
zone and on the best forecast of the flows on each direct current line for each scenario
and shall include the overall balance between load and generation for the transmission
system in the Union. There shall be no undue discrimination between internal and cross-zonal
exchanges when defining scenarios, in line with point 1.7 of Annex I to Regulation
(EC) No 714/2009.’
1.7 of Annex I to Regulation (EC) No 714/2009 outlines the following:
‘When defining appropriate network areas in and between which congestion management
is to apply, TSOs shall be guided by the principles of cost-effectiveness and minimisation
of negative impacts on the internal market in electricity. Specifically, TSOs shall
not limit interconnection capacity in order to solve congestion inside their own control
area, save for the abovementioned reasons and reasons of operational security. If
such a situation occurs, this shall be described and transparently presented by the
TSOs to all the system users. Such a situation shall be tolerated only until a long-term
solution is found. The methodology and projects for achieving the long-term solution
shall be described and transparently presented by the TSOs to all the system users.’
-
(11) Article 19 of Regulation 2015/1222 sets out more specific requirements with respect
to individual grid models, the basic building blocks of the common grid model:
-
‘1.
For each bidding zone and for each scenario:
-
(a)
all TSOs in the bidding zone shall jointly provide a single individual grid model
which complies with Article 18(3); or
-
(b)
each TSO in the bidding zone shall provide an individual grid model for its control
area, including interconnections, provided that the sum of net positions in the control
areas, including interconnections, covering the bidding zone complies with Article
18(3).
-
2.
Each individual grid model shall represent the best possible forecast of transmission
system conditions for each scenario specified by the TSO(s) at the time when the individual
grid model is created.
-
3.
Individual grid models shall cover all network elements of the transmission system
that are used in regional operational security analysis for the concerned time-frame.
-
4.
All TSOs shall harmonise to the maximum possible extent the way in which individual
grid models are built.
-
5.
Each TSO shall provide all necessary data in the individual grid model to allow active
and reactive power flow and voltage analyses in steady state.
-
6.
Where appropriate, and upon agreement between all TSOs within a capacity calculation
region, each TSO in that capacity calculation region shall exchange data between each
other to enable voltage and dynamic stability analyses.’
-
(12) Article 79(5) of Regulation 2017/1485 sets out the following requirement with respect
to regional security coordinators:
‘In accordance with the methodologies referred to in Articles 67(1) and 70(1), and
in accordance with Article 28 of Regulation (EU) 2015/1222, a regional security coordinator
shall be appointed by all TSOs to build the common grid model for each time-frame
and store it on the ENTSO for Electricity operational planning data environment.’
-
(13) Article 6(6) of Regulation 2017/1485 sets out two further obligations:
‘The proposal for terms and conditions or methodologies shall include a proposed timescale
for their implementation and a description of their expected impact on the objectives
of this Regulation.’
The expected impact on the objectives is presented below (points (13) to (18) of this
Whereas Section).
-
(14) The CGMM Proposal contributes to and does not in any way hamper the achievement of
the objectives of Article 4(1) of Regulation 2017/1485. In particular, the CGMM Proposal
serves the objective of determining common operational security requirements and principles
by prescribing a common methodology for the preparation of individual grid models
to be merged into the common pan-European grid model.
-
(15) In accordance with Article 4(b) of Regulation 2017/1485, and taking into account the
additional methodologies to be developed under Regulation 2017/1485, the creation
of the common grid model and use thereof in operational planning will contribute to
determining common interconnected system operational planning principles by ensuring
a common methodology for the preparation of individual grid models to be merged into
the common pan-European grid model.
-
(16) By having a common grid model prepared on the basis of a common, binding methodology,
the CGMM Proposal will ensure that the objective of contributing to the efficient
operation and development of the electricity transmission system and electriciy sector
in the Union is met insofar as the creation of a common grid model is based on a binding
methodology that has been subject to stakeholder consultation in accordance with Regulation
2017/1485 and that will be approved by regulatory authorities prior to application
in the Union.
-
(17) The CGM Methodology ensures and enhances the transparency and reliability of information
on transmission system operation by providing for monitoring of quality indicators
and publishing the indicators and the results of the monitoring.
-
(18) The CGMM Proposal also contributes to the objective of ensuring the conditions for
maintaining operational security throughout the Union (Article 4(1)(d) of Regulation
2017/1485) through the provision of a common grid model on the basis of a common methodology
specifying inputs for the preparation of individual grid models to be merged into
the common pan-European grid model.
-
(19) Finally, the CGMM Proposal will promote the coordination of system operation and operational
planning by virtue of providing for the establishment of a common model of the pan-European
grid that will be used in a coordinated manner throughout the Union (Article 4(1)(f)
of Regulation 2017/1485).
-
(20) In conclusion, the CGMM Proposal contributes to the general objectives of Regulation
2017/1485 to the benefit of all TSOs, NEMOs, the Agency, regulatory authorities and
market participants.