This Starter Data Kit provides structured annual data covering historical values and/or projections for the period 2023–2050. The dataset encompasses the full energy system, including the following sectors: residential, transport, industry, services, and agriculture. It is designed to support energy system analysis and modelling by compiling key techno-economic and resource-related parameters necessary for scenario development and long-term planning. The repository includes annual data on: End-use energy demands Capital and operating costs Technology efficiencies Operational lifetimes Capacity factors Residual capacities Emission factors Energy resource availabilities Wherever possible, original data sources are explicitly linked or clearly stated to ensure transparency, traceability, and reproducibility.