An indicator of Average Interruption Time in the power transmission system; expressed in minutes per year, it is a product of 60 and energy not supplied (ENS) by the power system, divided by the average power supplied by the transmission system, expressed in MW.
ATC allocation method
A method of capacity calculation and allocation on the border between systems or zones, where commercial volumes of capacity are offered on the basis of arrangements made between operators of two neighbouring bidding zones in the period prior to capacity allocation (i.e. before the capacity auction), taking into account physical properties of the zones and having regard to congestions and expected demand for trading capacity.
Capacity Allocation and Congestion Management
Central and Eastern Europe region
PSE Computer Emergency Response Team
Central Investment Unit (Centralna Jednostka Inwestycyjna)
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 procurement of energy and reserves.
A region created by merging the CEE and CWE regions.
The Core Capacity Calculation Region
The Central-West Europe region
Day Ahead Market
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
DSR Intervention Programme
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.
Extra high voltage
An indicator of electrical energy not supplied by the power transmission system. Expressed in MWh per year, it represents a sum of products of power not supplied due to interruption and its duration. The indicator includes short, long and very long interruptions, including or excluding 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
Internet of Things
Transmission Network Code (Instrukcja Ruchu i Eksploatacji Sieci Przesyłowej)
Centrally Dispatched Generating Units (Jednostki Wytwórcze Centralnie Dysponowane)
Local Implementation Project
Main location of the organisation
Head Office based in Konstancin-Jeziorna
National Centre of 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 tasks related to Single Day-Ahead or Single Intraday Coupling.
Non-Centrally Dispatched Generating Unit (jednostka wytwórcza niebędąca jednostką wytwórczą dysponowaną centralnie).
Area Dispatch Centre (Obszarowa Dyspozycja Mocy)
Reduction facilities (obiekty redukcji)
Operating Capacity Reserve (Operacyjna Rezerwa Mocy)
Organisational unit – PSE’s organisational structure including department, office and the Central Investment Unit.
Prosumer Energy Cloud
Polish Power System, also referred to as "power system"
“Development Plan for meeting the current and future electricity demand”, also referred to as “Transmission Network Development Plan”, drawn up by the Transmission System Operator for a period of 10 years. PRSP is a directional document containing a plan of transmission network investment proposals of a upgrading/development nature, the implementation of which contributes to the improvement of the technical and economic operation conditions of the Polish Power System. PRSP takes into account the strategic domestic development objectives of the power sector as well as the EU regulations and plans for the development of cross-border interconnections. At its preparation stage, PRSP is subject to consultation with the interested parties and it is agreed with President of the Energy Regulatory Office.
PSE Capital Group
PSE ZKO locations
Locations of field subunits (zamiejscowe komórki organizacyjne) in Warsaw, Radom, Katowice, Poznań and Bydgoszcz.
Investment Projects Plan (Plan zamierzeń inwestycyjnych)
Reliability Centred Maintenance
Regional Supervision Centre (Regionalne Centrum Nadzoru)
A measure activated by one or more system operators where the generation or load pattern is changed in order to change physical flows within the transmission system and reduce congestions.
Report publication date
17 December 2020
Renewable Energy Sources
Regional Operation Centre
Regional Security Coordination Initiatives
Single Intraday Coupling. A process in which orders placed are matched in a continuous manner and simultaneously cross-zonal capacity is allocated to different bidding zones in the Intraday Market.
Transmission System Operators Security Cooperation; an initiative established in December 2008 whose objective is to improve the operational security of the interconnected power systems in Central Europe through the intensification of cooperation between operators.
TSCNET Services GmbH, a company whose activities include the services of technical support to transmission system operators in operational planning processes and support in carrying out concept work under the regional initiative TSO Security Cooperation. The shareholders of TSCNET Services are a dozen or so European transmission system operators.
Technical system owner
Transmission system operator, also referred to as "operator".
Electricity supply continuity index (wskaźnik ciągłości dostaw). The indicator is calculated as the total quantity of electrical energy delivered to transmission service customers (DSOs and final consumers) divided by the sum of the quantity of electrical energy supplied and not supplied to those consumers during a year.
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.
Field units of PSE and field job positions of PSE units in Bydgoszcz, Katowice, Poznań, Radom and Warsaw.