Since 2006, with the integration of Latvia into the European Union and the implementation of its regulations, AS a "high Voltage network" becomes an independent transmission system Operator (TSO), one of its responsibilities is to develop sector development documents, planning and Coordination by pooling The development of the system in a single evaluation report. Historically, both in Latvia and in Europe, the development of electricity systems has largely been identified by energy companies with a small number of large generation sources, but the Third energy package (The EU liberalisation plan for the European Energy system, endorsed by the European Parliament in 2009), has significantly increased the capacity of European national electricity transmission system operators The importance of providing free market access to smaller companies on an equal footing with energy giants in the development of transmission networks and systems. However, equal conditions for large and small Sources of generation – given that many small generators use renewable energy sources (wind, sun, water, biomass and biogas) and depend on the weather and the available natural resource, it is also a major challenge for transmission system operators that Be able to balance the generation with consumption, providing, if necessary, the issuance and uptake of energy by each transmission system Operator's responsibility area, while ensuring necessary spare capacity regulation and emergency situations, In order to meet demand for high generating capacity or interconnection in an In cases of blackout. With the more rapid development of renewable energy sources, supported both by the European Union policy and by the long-term development strategy of Latvia, the annual evaluation report prepared by the transmission system Operator is an important document The development of the Latvian electricity system, as it raises and looks at a number of possible generation scenarios, analyses consumption and peak loads, examines the electricity balance for the 10-year interval and informs about the available capacity Workload in the near future. Based on this report, as well as the Ten-year development plan, the electricity transmission system operators ' associations (ENTSO-E) The ten-year development Plan of the European Transmission Network (TYNDP), which is one of the basic documents on the basis of which the European Union's co-financing for the development of the electricity system and market integration can be linked. The report also contains up-to-date information for all users of the electricity system, which helps to understand the evolution of the electricity system and the direction of the development of the transmission network, and for merchants to plan new generation developments, Based on market trends and demand. The annual assessment report of the transmission system Operator shall be based on the provisions of the Cabinet of Ministers Regulation 322 "provisions on the annual assessment report of the transmission system Operator" and are freely available AS "high voltage Network on www.ast.lv. The annual assessment report of the transmission system Operator shall be drawn up taking into account the energy guidelines approved by the Cabinet of Ministers of Latvia For the analysed time interval, the Latvian energy long-term strategy 2030, the European Commission Energy developments in the long term. The transmission system Operator is currently working on a recent version of the report that will be discussed and published in early October of this year.