Prestige City power: My insider doubts

What's the real story with full flat power backup in Prestige City? I work in real estate, so I know how builders spin things, but buying for myself is different. They promise 100% backup, but usually it's just common areas and one light point. Anyone living there can confirm if it covers ACs or geysers? Also, how's the water supply reliability? Tanker dependency is a nightmare I want to avoid. Off the record, are there any hidden charges for backup genset fuel?