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Electricity Market Operator (OTE)
Joint-stock company owned by the Czech Republic focused on market operator activities carried out based on the licence granted by Czech Energy Regulation Authority (ERÚ) pursuant to Section 4(3)(c) of the Energy Act. In particular, the Company is responsible for coordinating supply and demand on the Energy market. Moreover, it organizes short-term energy market (short-term day-ahead and intra-day markets) and evaluates the energy market based on regulated access to the transmission and distribution systems. The Company also settles imbalances between real and negotiated power supplies and consumption. It prepares monthly and annual reports on the power system and manages the register for greenhouse gas emissions trading scheme.
Energy Act
Act No. 458/2000 Sb., on business conditions and public administration in the energy sectors and on amendment to other acts (“Energy Act”). More information here.
European Network of Transmission System Operators for Electricity (ENTSO-E)
Association of 41 transmission system operators from 34 European countries founded by Regulation (EC) No 719/2009 of the European Parliament and Council; responsible in particular for creating network codes, coordinating technical cooperation, drafting 10-year network development plans, issuing summer and winter outlooks of production capacities adequacy and participating in completing the EU internal energy market. More information at www.entsoe.eu.
Czech power system (PS)
A complex of all the facilities and equipment necessary for electricity generation, transmission, transformation and distribution, including connecting and direct power lines, as well as metering, control, protection, information and telecommunications systems.
Czech transmission system (TS)
A mutually interconnected complex of 400kV and 220kV power lines and facilities and certain selected 110kV lines (specified in Annexes to Part VII of the Grid Code – TS facilities) used for electricity transfer throughout the Czech Republic and for interconnection with the power systems of neighbouring countries.
ČEPS dispatch control system
Technical support for dispatcher decision-making. The system provides on-line information delivered from the transmission system and power stations, allows the remote control of substations, voltage control and balancing electricity generation and consumption whilst complying with the schedule of exports from and imports to the Czech Republic and a number of other functions for dispatcher support.
Electricity quality
Key parameters for electricity quality assessment consist of voltage and frequency. Whilst the frequency value is identical at all points of the power system (approximately 50Hz), the voltage value may differ at different points. Frequency and voltage control at selected nodes is necessary to maintain the required electricity quality.
Electricity trader
A natural or legal person who holds a trading licence and purchases electricity for re-sale.
N-1 criterion
The basic security criterion of power system reliability. This criterion expresses the ability of the power system to maintain normal operation after the outage of any single network element (a line, transformer, generating unit etc.) with possible short-term local consumption constraints.
N-2 criterion
A higher level of system security, wherein the power system can withstand the outage of two network elements (a line, transformer, generating unit etc.). Following the connection of the Temelín and Dukovany NPPs to the network, the standard N-1 criterion was changed to the stricter N-2 criterion.

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