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Constellation Energy's largest deal to supply power for AI data centers will not begin generating payments until June 2027, according to new reporting, tempering near-term financial expectations from the agreement. The utility has been positioning itself as a key power supplier to the booming AI data-center sector. The delayed payout timeline highlights the long lead times involved in scaling nuclear and other power capacity to meet surging AI-related electricity demand, even as such deals are seen as strategically important for future revenue growth.