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In Turkey as in Europe, the share of natural gas (NG) in the generation of electricity has shown a dramatic increase since the 1990s. Although Turkey faced two economic crises in the last decade, its total electricity generation has increased by 60%. NG consumption was 0.43 bcm in 1987 and reached 40 bcm by 2014. A big fraction of total electricity generation (TEG) is produced from NG. While the NG-based electricity generation was 0.2% in 1985, its share increased rapidly and it has reached to 48% of the TEG in 2014 and share of NG in total thermal power is about 60%. The goal of this paper is to review the historical development of the electricity and NG sectors, and to forecast and review the process of electricity generation with NG. Additionally, this paper compare the use of NG in electricity generation in Turkey and World, and analyze the supply–demand projections and future prospects in the field of energy. Results obtained from the present study show that a diversity of energy resources has not been achieved and as it is today in meeting the increasing energy demand, NG will continue to be a priority in the future. [ABSTRACT FROM AUTHOR]

Abstract Increasing flexibility in electricity systems with high-shares of volatile renewable generation is on top of the European policy making agenda. Large-scale pumped hydro storages are appropriate technology candidates to accomplish this. Therefore, they are one of the focus technologies of the European Commission in the Projects of Common Interest discussion. In order to get listed a thorough system benefit analysis has to be conducted. This paper investigates a comprehensive socio-economic benefit analysis of storage technologies according to the indicators expected by the European Commission. The dispatch model EDisOn + Balancing is applied, which includes the functionalities depicting balancing mechanisms. Additionally, the profitability analysis tries to sort out the most convincing business cases where storage technologies contributing to more flexibility in the electricity system can sustain in the long-run. A simulation tool has been developed to model and quantify flexibility options, and to evaluate the profitability from the owner's point-of-view. The results show that in Central Europe with increasing storage capacities the necessity of reserve capacity and investments in peaking units decreases while maintaining a high security of supply level. In addition to electricity generation and balancing cost reductions, shedding of renewables and significant amounts of environmental damage costs of up to 1300 MEuro/a can be avoided. The profitability study shows that a reduction of minimum load or retrofitting hydro reservoir storages with pump mode increase the hours of participation in balancing markets and machine utilisation, e.g. operating hours and frequency of machine starts. With the latter also wear of machines increases. Therefore, it is important to find the optimum in terms of machine starts and market benefits. Several benefits are presented per installed capacity to provide scalability and transferability of outcomes for other applications. Furthermore, the analyses make an important contribution to the European Projects of Common Interest discussion. Highlights • Planned hydro projects in AT till 2030 avoid environmental damage costs of 1300 MEuro/a in CE. • 3.5 GW turbine capacity in addition replaces 1 GW of thermal power capacity. • Reducing minimum load of PHS by 50. [ABSTRACT FROM AUTHOR]