Why is Constellation Energy stock rallying 4% today?

Constellation Energy stock saw a 3.9% rise in pre-open trading following the company's announcement of a 20-year power purchase agreement with Amazon. This deal involves 690 megawatts of nuclear output from the Calvert Cliffs Clean Energy Center in Maryland, with an additional 190 megawatts of new emissions-free capacity expected between 2030 and 2032, backed by over $3 billion in infrastructure investment.

Constellation's CEO, Joe Dominguez, emphasized that the agreement is crucial for the plant's future and represents a strong foundation for future investments in the facility and advanced nuclear technologies. Beyond the immediate financial benefits, the deal provides Constellation with the revenue certainty necessary to pursue a 20-year license renewal for Calvert Cliffs, reducing risk for the company's long-term generation portfolio.

This positive news reversed Wednesday's decline, when shares dropped due to FERC placing a five-month hold on PJM Interconnection's reliability backstop procurement submission over cost-allocation concerns. The broader market was also moderately supportive, with the S&P 500 up 0.3% and the Nasdaq up 0.6%. Sector peers that had also declined were not affected by today's bounce, indicating that the Amazon deal is a company-specific catalyst rather than a sector-wide trend.

Social trading platforms reported a shift in retail sentiment to strongly bullish overnight after the deal's scope was clarified. The combination of a high-profile long-term contract with Amazon, the prospect of multi-decade plant relicensing, and a mildly positive macro backdrop contributed to Constellation shares rising in pre-market trading, erasing much of Wednesday's FERC-related losses and reinforcing the company's role in powering AI infrastructure developments.