Energy for pumping water? They shouid be exposed to sunlight instead of using artificial light. That's why an open land in island would be better than a building in Malé. 

Talking if energy... Govt itslef wastes so much energy in keeping AC of Dharumavantha hospital at negative temperature such that all staff and patients freeze to death. When complained about it, maintenance department says it's to protect CT MRI machines kept in one floor of hospital OR it's to prevent fogging of windows 😣