Barakah in a most-expensive list surprises me. Four APR-1400s, on budget, twelve years from first concrete to commercial operation, now 25% of Abu Dhabi's electricity. I would rank by cost per kW before calling a project expensive.
⚡ World’s Most Expensive Electricity Projects
🇬🇧 Hinkley Point C, United Kingdom
🇺🇸 Vogtle Units 3 & 4, United States
🇦🇪 Barakah Nuclear Energy Plant, UAE
🇹🇷 Akkuyu Nuclear Power Plant, Türkiye
🇧🇩 Rooppur Nuclear Power Plant, Bangladesh
🇨🇭 Large Alpine hydropower and pumped-storage projects
🇧🇷🇵🇾 Itaipu Hydroelectric Plant, Brazil–Paraguay
🇨🇳 Three Gorges Project, China
🇬🇧 Sizewell C, United Kingdom
🇫🇷 Flamanville 3, France
🇿🇦 Kusile Power Station, South Africa
🇿🇦 Medupi Power Station, South Africa
🇧🇷 Belo Monte Hydroelectric Plant, Brazil
🇪🇹 Grand Ethiopian Renaissance Dam, Ethiopia
🇫🇷 EPR2 Nuclear Program, France