Issued by Romania, this striking blue 11 lei stamp commemorates the country’s post-war industrial expansion under the Five-Year Plan. The design features a large hydroelectric dam, transmission tower, and rising power-output graph, symbolizing rapid electrification. The inscription notes the installed national capacity of 1,700,000 kW, highlighting progress in rural and urban electrification. Strong socialist-realist artwork and bold typography make it a classic mid-1950s Eastern Bloc industrial theme. A desirable piece for collectors of energy, engineering, and propaganda-era issues, especially in fresh MNH condition.