What is the exemption from taxation by States in respect of water or electricity in certain cases?
No law of a State in force immediately before the commencement of the Indian Constitution shall impose, or authorize the imposition of, a tax in respect of any water or electricity stored, generated, consumed, distributed, or sold by any authority established by any existing law or any law made by Parliament for regulating or developing any inter-State river or river valley, unless the President otherwise provides by order.