Core Viewpoint - The article discusses the launch of a large-scale battery energy storage system in Bulgaria by Renalfa IPP, which is part of a mixed renewable energy project with a total capacity of 315MW/760MWh [2][3]. Group 1: Project Overview - The initial phase of the energy storage system has a capacity of 65MW/260MWh and is now operational [2]. - The overall Te ne vo mixed renewable energy project will include a 238MW solar power plant, a 315MW/760MWh energy storage system, and 250MW of wind turbines, making it the largest and most complex hybrid energy storage project in Bulgaria [2]. - The project is a joint development between Renalfa IPP and Danish developer EuroWind Energy, with technology provided by Haicheng Storage and Kehua, and project management by Bulgarian developer Solarpro [2]. Group 2: Financial and Operational Aspects - The project is financed by the European Bank for Reconstruction and Development (EBRD) and Raiffeisen Bank International AG [3]. - Renalfa is active in Bulgaria, Hungary, North Macedonia, and Romania, with a total project scale exceeding 1GW and over 4GW of energy storage and renewable energy projects in reserve [3]. - The newly constructed energy storage system has become one of the largest combined battery storage systems in Europe, increasing Renalfa's total operational storage capacity to over 1GWh [3].