IAEA Nuclear Energy, Vendor, User Requirements, Responsibilities, Nuclear Cogeneration Projects, Electric Power and Heat, Nuclear Power Plants, NPPs, Total Energy Systems, On-Site Electric Power Production, Electricity, Process Heat, Nonelectric Applications, Desalination, District Heating, Cooling, Hydrogen Production, Dependence on Fossil Fuels, Design, Operation, Management Phases, Analysing the Requirements, Responsibilities of Users, Economic Aspects, Safety Considerations, Environmental Protection, Regulations, Technical and Contractual Matters, Correspondence, Life Cycle, Lessons Learned, Retrofit, New Build Projects, Stakeholder Involvement, User and Vendor Roles, Market Mapping, Understanding End User Needs, Feasibility, Selection of Vendors, Various Stages, Project Implementation, Case Studies, Nuclear Cogeneration Systems, Regulatory Requirements, Communication Aspects, Negotiation of the Business Model, Authorization, Decommissioning, Review