Germany's Energy Transition Measured Against Its Ability to Deliver

Germany’s energy transition is usually described in terms of installed capacity, annual renewable generation and future expansion targets. This report applies a different criterion: deliverability — the ability of the energy system to provide the required power and energy at the point of consumption for the entire required duration. The analysis combines the Global Energy Security Index 2026, the work of Václav Smil, documented operating conditions in Germany, data and reports from grid operators and public authorities, and comparative evidence from California, Portugal, Greece and China. The report distinguishes systematically between installed capacity (GW), delivered power (GW), energy requirements over time (GWh/TWh), grid availability, storage duration and secured energy supply. Germany’s position in the Global Energy Security Index, its dependence on energy imports, documented wind and solar operating conditions, electricity-price patterns and grid-connection constraints are examined within this framework. A central quantitative case study considers a 12–13 hour period without photovoltaic generation and a wind contribution of 6–9.5% to a constant 60 GW demand. Under these explicit assumptions, 54.3–56.4 GW, corresponding to 651.6–733.2 GWh, initially have to be supplied by other sources before accounting for additional available generation and secured imports. The report also examines the role and limitations of battery energy storage systems (BESS), vehicle-to-grid concepts, electricity imports, transmission infrastructure and seasonal energy storage. California is used as a comparative case: despite substantial battery deployment, CAISO-based data evaluated in the report show 5.256 TWh of renewable curtailment from January through 18 October 2026. The analysis therefore distinguishes short-duration flexibility from the energy inventory required for prolonged periods of low renewable generation. Beyond electricity, the report addresses industrial process heat, hydrogen and molecular energy carriers, raw-material requirements, infrastructure construction, import logistics and the material foundations of industrial production. It argues that an energy transition must be evaluated as an integrated supply chain comprising generation, transport, storage, conversion, fuels, industrial processes and operational reserves. The resulting policy and investment criterion is straightforward: a target becomes an operational energy-supply plan only when power, energy, transport capacity and operational readiness are demonstrated for the required place, time and duration. Replacement capacity must be operational before the function it replaces disappears.