Within the framework of the tender submitted, the upgrading of district heating lines, the development of new pipeline sections and the connection of new customers to the district heating network, as well as the interconnection of heat districts, have been included in the eligible costs. Design of new pipeline sections: At present, the heat supply of the buildings of Budapest is mainly carried out by means of heat generating installations using natural gas. The high number of point sources has a negative impact on air pollution levels and it would also be desirable to increase the proportion of heat generation using alternative heat sources (geothermal energy, waste recovery, biomass). As set out in the Remote Heating Action Plan, there are a number of advantages of connecting new consumers to the district heating system, among which the following can be highlighted: — Improving the air quality of Budapest — Heat supply to new customers at competitive prices — Fossil energy saving compared to the originally planned on-site natural gas-based heat generation The FÖTÁV Zrt. therefore plans to develop new district heating couples for the installations detailed in the present tender. In addition, Főtáv Zrt. According to its strategy adopted on 9 December 2015, the shrinkage of the heat market reported by declining consumption of existing consumers (due to energy upgrades) should be slowed down and stopped by connecting new consumers. This is in line with the 2030 objectives of the National Energy Strategy, which also aims to significantly expand the district heating market in Budapest. Another important task is to interconnect districts so that heat generation and distribution can be achieved in a more flexible, cost-efficient and energy-efficient way. The construction of the new pipeline sections requires a cable licence. Most of the consumers to be integrated into the district heating system have been in operation for several years and have their own heat production system. In general, these heat production systems are based on conventional natural gas-fired boilers, which can be considered obsolete due to the development of technology. They are inefficient compared to the currently available combustion plants, which can only be worsened by inadequate or incomplete maintenance. A number of systems would require complete renovation in boiler rooms if the consumer did not choose district heating. A small group of new consumers will start heating with the help of district heating. In their case, the amount of natural gas fuel required by boilers using condensation technology, which is currently realistic to be taken into account for the modelling of the energy consumption without district heating, has been taken into account. The average boiler efficiency of customers to be connected to district heating has been set at 90 %, which is considered conservative in terms of the over-representation of consumers with heating systems currently in operation. New consumers who are connected on the basis of the preliminary concepts: Zoo Pannonpark 1146 Budapest, Zoo krt. 6-12. hrsz 29753 Zoo old building 1146 Budapest, Zoo krt. 14th hrsz 29732/8 Art Hall 1146 Budapest, Dózsa Gy. U. 37. 29732/10 Vajdahunyad Castle 1146 Budapest, Városliget 29732/11 Teleki Blanka High School 1146 Budapest, Ajtósi Dürer row 37. hrsz:31675 Szent István High School 1146 Budapest, Dürer Ajtósi row 15th hrsz: 32708 New National Gallery 1146 Budapest, Városliget hrsz: 29732/1 Hungarian Museum of Technology and Transport 1146 Budapest, Városligeti körút 11, hrsz 29732/1 Olof Palme House 1146 Budapest Olof Palme Promenade 1. hrsz 29732/1 Hungarian Music House 1146 Budapest, Városliget hrsz 29732/1 Ethnographic Museum 1146 Budapest, Városliget hrsz 29732/1 City Park Theatre 1146 Budapest, Városliget hrsz 29732/1 Urban Park hrsz 29732/11 The elements of the Primer pipeline network, most of the district heating lines are outdated, their specific heat loss is high partly due to environmental effects and partly due to materials and strata not meeting the expectations of our time. Reducing heat losses and renewing fittings for the pipelines is therefore essential, which can result in significant energy savings. The upgrading of the existing sections requires a permit for the construction of pipeline rights. The implementation sites covered by the tender are XI. Irinyi J. Street 4133/7 XI. Rátz L. street 3162 3170/54 XI. Fejér L. u. — Mohai street 3592 3605/2 3605/5 3608/1 3594 3604/1 XVIII. Nefelészcs u — Gölle u. — Ferenc utca 152616/11 XIX. Artúr u. 11-17. (P003381) and Simonyi Zsigmond u. 1-11. 162700/1 162700/2 162700/11 162700/7 III. Silverhegy utca 62321/152 62321/153 III.Pethe Ferenc tér 2. 18910/36 XI. Fehérvári út Albertfalva street — Bükköny u. 43033 43034/1 43034/2 43259 43205/2 43205/1 XI. Budafoki út — Dombóvári út 4042/91 XI. 853/26 853/16 853/17 853/22 853/23 XXII. 22578 22579/1 XIII. Göncöl street