germany-cologne: energy and related services./ ecological and economic optimization for sustainable reorientation and expansion of the energy supply of koelnmesse gmbh./ koelnmesse intends to optimize the existing energy supply as part of its overarching sustainability strategy and adapt it to the work conditions changed by the master plan measures. the long-term goal is a significant reduction or complete elimination of all co2 emissions from trade fair operations. the aim of this call for tenders is to identify the most economical, sustainable technical solution and to determine its ecological and economic effects holistically using the following criteria: ecological impact: primary energy factors and annual co2 emissions as well as other climate aspects economic impact: working price and performance price from commissioning for a period of at least 15 years accordingly, one or more technically experienced, suitable partners for long-term cooperation should be identified and commissioned at the end of the award procedure