From a lengthy article in German advocating a hydrogen energy economy in 2030. Losses (“Verluste” ) in red. Quantity labels (absolute/percentage) not used consistently on all arrows.
Comparison current Energy Scenario in Germany with 2030 Hydrogen Energy Economy (right)
Comparison Biomass Methan Energy Scenario in Germany with 2030 Hydrogen Energy Economy
Could also be presented as pie charts, but author opted to do a simple breakdown using Sankey-style arrows.