The European Union (EU)-funded KitNewCare consortium aims to create and manage a comprehensive EU-wide programme focusing on sustainability in Kidney Care. Around 850 million people have chronic kidney disease (CKD) worldwide and by 2030, 6 million will need kidney replacement therapy, mainly haemodialysis. As the world population gets older, projections for the end of the century worsen. From a sustainability perspective, healthcare systems contribute around 5-11% of total carbon emissions. Kidney care is one of the most resource-intensive specialties. In addition to energy, haemodialysis and peritoneal dialysis require transportation of patients and personnel to and from facilities, use large volumes of water and generate significant plastic waste. Overall, current dialysis is not sustainable in the medium term. Primary prevention, early diagnosis and treatment of CKD and transplantation will decrease the need for dialysis, but this will take time and will not prevent the need for dialysis in millions of persons. There is a need to improve knowledge around the environmental and financial cost of kidney care and social and health outcomes of each patient pathway including using holistic tools such as life cycle assessment. This knowledge will allow workflow optimisations, organisational transformations and technological innovations across Europe, learning from different clinical sites. KitNewCare will build a European-wide knowledge base for sustainability in kidney care, develop and introduce a novel 4-factor database for comprehensive impact analysis, implement optimised processes and organisational transformations in four European clinical sites. It will also pilot innovations from small- and medium-sized high-tech enterprises with a focus on kidney care, and establish a network for continuous monitoring, benchmarking, and implementation of sustainable solutions across healthcare sectors. This paper presents the rationale behind selecting kidney disease as a focal point, summarises the current state of knowledge, and outlines the foundational statement underlying KitNewCare's operational framework.