If you live in the Mumbai Suburbs, you have a choice between Reliance Energy and Tata Power. Mumbai Suburb here means Bandra to Borivili on western side, sion to Powai on central side and up to Bhandup on Harbor side. It does not include Navi Mumbai. If you’re in the island city of Mumbai, you have a choice between BEST and Tata Power. However, this is switching between the two is currently not possible due to a case pending at the Supreme Court.