Нурекская ГЭС

Academic article on CyberLeninka (peer-reviewed journal) explicitly states "сметная стоимость строительства - 273 млн. руб" — the approved project construction estimate at 1961 prices. This is the standard Soviet-era сметная стоимость figure established when the project was approved. The article also notes partial expenditure milestones (40.2 млн руб over first four years by 1965; 160 млн руб additional for second phase 1974–1976), consistent with a multi-decade buildout significantly exceeding the original estimate, but no single authoritative final actual cost figure was found in verified sources. The 273 million ruble figure is the most precisely cited documented cost in accessible scholarly sources.