Fraunhofer’s own math says 2050 electricity demand is ~700–750 TWh (≈80 GW average load), yet they assume 500–750 GW PV + wind — that’s 6–9× average demand and 5–7× today’s installed base (p. 15). On top of that, they still need 100–150 GW gas turbine backup plus major battery storage (p. 17), i.e. almost the whole peak load duplicated in flexible backup. In their model this cuts CO₂ by >95 % vs. 1990 (p. 11), which I accept technically. But given we already see close-call outages in Germany during “Dunkelflauten,” and given that today’s reality is ~40 ct/kWh for households instead of the 7–9 ct/kWh Fraunhofer projects (p. 65 ff.), I find their economic modeling divorced from the trajectory we’re actually on.

Can you follow?