Constellation Energy — AI supply-chain exposure

Constellation Energy is the largest nuclear generator in the United States, and it sits in the energy layer as a supplier of firm, carbon-free baseload power. Increasingly that output is being contracted directly to data-center operators, who need round-the-clock electricity rather than the intermittent supply that wind and solar deliver. What it sells is grid capacity and a competitive cost per unit of power, not anything made of silicon.

Power has become one of the gating inputs for the AI build-out, and firm capacity is scarcer than the raw megawatts suggest. Nuclear plants run continuously, which is exactly the profile a training cluster needs, and new firm supply is slow and hard to add. That scarcity gives established generators leverage in long-dated power contracts — the structural reason the model reads Constellation as centrally exposed.