the Average Interruption Time index for a power transmission system; expressed in minutes per year, it is the product of 60 and the index of electricity not supplied (ENS) by the power transmission system, divided by the average capacity supplied by the power transmission system expressed in MW
ATC allocation method
a method of calculating and allocating the transmission capacity at a boundary between systems or zones, in which commercial transmission capacity is offered based on arrangements made between operators of two adjacent price zones in a period before the capacity allocation (i.e. before a capacity auction), based on physical characteristics of these zones, and taking into account the network congestion and the expected demand for commercial transmission capacity
Capacity Allocation and Congestion Management
the region of Central and Eastern Europe
PSE Computer Emergency Response Team
construction without outages
Construction in the course of which there are no outages for the purposes of construction and off-line commissioning of equipment (i.e. prior to connection to the power network). Construction without outages involves the use of technologies, work organisation and methods of construction and conversion of existing facilities which allow the construction site to be situated outside the energised area. In practice, this can mean the construction of a new substation or switchyard in a new area (purchased where necessary) or the construction of a new facility on the site of an existing one in a manner that does not interfere with operating equipment.
simultaneous purchase of electricity and reserves
a region formed after a merger of CEE and CWE regions
Core Capacity Calculation Region
Central Investment Unit
the region of Central and Western Europe
Date of report
November 22, 2021
A period when full functionality of a network infrastructure element is not available, resulting in: outage of a current circuit, outage of an optical fibre link (no transmission) or limiting the functionality of a current circuit or an optical fibre link. In the case of a power line, the current circuit and the optical fibre link are each a network infrastructure element. The contractor is responsible for the downtime of any network infrastructure element subject to construction or conversion, irrespective of the scope of such construction or conversion that should be delivered as the object of the contract, excluding however any responsibility for outages of the components of such element which constitute the contracting authority’s supplies (if applicable). The absence of full functionality resulting in the outage of a current circuit or outage of an optical fibre link means that a situation has arisen for that circuit or path, resulting from causes other those related to network operation management, due to which it is not possible to use this circuit or link.
Distribution System Operator
The transmission equipment availability factor – DYSU – is calculated as the arithmetical average of availability factors for 5 groups of transmission equipment including groups of lines and transformers installed at our substations. The availability of each of those equipment groups is calculated as the ratio of the actual working time of transmission equipment (in hours) during a year to the nominal number of hours in a year. The DYSU factor is designed to monitor the readiness of transmission network elements to provide the electricity transmission service and takes into account the availability of the following 5 groups of transmission equipment: 1. Category L1 lines; includes international, radial lines and lines operating at 400 kV with peak load above 300 MW, as well as lines operating at 220 kV with peak load above 170 MW. 2. Category L2 lines; includes other lines. 3. Power plant lines LB; lines evacuating power from plants (connecting power plants with power plant substations). 4. Transformers at Category S11 substations; includes substations connected with systems of other countries, power plant substations and 400 and i 220 kV network coupling substations. 5. Transformers at Category S22 substations; includes other substations.
the index of energy not supplied by the power transmission system. It is expressed in MWh per year, and is the sum of the products of the capacity not supplied due to an interruption and the duration of this interruption. It includes short, long and very long interruptions with and without consideration of catastrophic interruptions
European Network of Transmission System Operators for Electricity
Energy Regulatory Office
Flow-Based Market Coupling
Global Reporting Initiative Standards
Health and Safety, Environment and Quality
Information and Communication Technology
International Electrotechnical Commission
DSR Intervention Program
Transmission Network Code (Instrukcja Ruchu i Eksploatacji Sieci Przesyłowej)
Centrally Dispatched Generating Units (Jednostki Wytwórcze Centralnie Dysponowane)
Local Implementation Project
Locations of ZKO PSE
locations of branch divisions (organizational units) in Warsaw, Radom, Katowice, Poznań and Bydgoszcz
Main location of the organization
Headquarters based in Konstancin-Jeziorna
The National Center for Research and Development (Narodowe Centrum Badań i Rozwoju)
Nominated Electricity Market Operator.
An entity designated by the President of ERO or a competent regulatory authority in another Member State to perform the tasks related to the Single Day-Ahead or Intra-Day Market coupling.
a generating unit that is not a centrally dispatched generating unit
National Power System, also called the power system
Area Dispatching Center
Operational Capacity Reserve
Organisational unit – PSE’s organisational structure including department, office and the Central Investment Unit.
Prosumer Energy Cloud
A development plan for meeting the current and future electricity demand, also known as the “Transmission Network Development Plan”, is prepared by the Transmission System Operator for a period of 10 years. PRSP is a guidance document that contains a plan of investment projects related to modernization and development of the transmission network, the implementation of which contributes to the improvement of technical and economic conditions of the national power system operation. PRSP takes into account strategic national objectives for the development of the power sector , as well as EU regulations and plans for the development of cross-border connections. During the preparation stage, PRSP is subject to consultations with stakeholders, and is agreed with the President of the Energy Regulatory Office.
PSE ZKO locations
Locations of field subunits (zamiejscowe komórki organizacyjne) in Warsaw, Radom, Katowice, Poznań and Bydgoszcz.
PSE Investment Project Plan
Regional Coordination Centers
Reliability Centered Maintenance
a regional monitoring center
A measure triggered by one or more system operators by changing the generation or load patterns to alter physical flows within the transmission system, and to reduce physical congestion.
Renewable Energy Sources
Regional Operation Center
Regional Security Coordination Initiatives
Single Day-Ahead Coupling.
The process in which orders submitted are matched simultaneously with the allocation of inter-area transmission capacity.
Single Intra-Day Coupling.
The process in which complex orders are matched on a continuous basis while the inter-area capacity is allocated.
System Operation Guideline
Poland - Sweden connection
Transmission Network Code
Transmission System Operators Security Cooperation – an initiative established in December 2008, aimed at increasing the operational security of the interconnected power systems in Central Europe by intensifying cooperation between operators
the company TSCNET Services GmbH, whose business includes technical support services for transmission system operators in operational planning processes and support for conceptual tasks carried out within the framework of the regional initiative TSO Security Cooperation. The shareholders of TSCNET Services include several European transmission system operators
Technical System Owner
Transmission system Operator, also referred to as: the operator
electricity supply continuity index
An IT trading platform for cross-border Single Intra-Day Coupling, based on a central IT system connected to the local trading systems of NEMOs and Transmission Operators, enabling Single Intra-Day Coupling.
IT trading platform for cross-border Single Intraday Coupling, based on a central IT system connected with local trading systems of NEMOs and Transmission System Operators, supporting Single Intraday Coupling.
a two-way redispatching
Field units of PSE and field job positions of PSE units in Bydgoszcz, Katowice, Poznań, Radom and Warsaw.