Bloom Energy vs Constellation Energy: Which Clean Energy Stock Is Better for AI Data Center Power in 2026?

This article compares Bloom Energy and Constellation Energy as two ways to play the surging electricity demand from AI data centers. Bloom makes on-site fuel cells and recently signed a $25 billion financing deal with Brookfield, but it still posts net losses and carries a high debt-to-equity ratio of 3.9x. Constellation runs the largest fleet of nuclear plants in the US, now with 55 GW of capacity after buying Calpine, and it generates steady profit with a net margin of 9.1% and free cash flow of $1.3 billion. The valuation gap is wide. Bloom trades at a forward P/E of 96.5x while Constellation sits at 21.5x. The article leans toward Constellation for lower risk and established revenue from long-term data center contracts. Bloom is positioned as a higher risk, higher potential bet on distributed generation if grid interconnection bottlenecks continue to worsen.