The Cohort Sorted: Leaders, Followers, and Laggards

The AI2 turbines/utilities/behind-the-meter universe has clearly bifurcated. The violent leaders — GEV (+65% YTD), BE (~+68% in 90 days), and the IPP quartet (VST, CEG, TLN, NRG) — have had their runs. What remains is a smaller set of names still in the gradual-mover phase, plus a group of regulated-utility and non-US OEM names that simply aren't participating in AI capex re-rating.

CAT: Validated Structural Re-Rating, Diminishing Consensus Headroom

Caterpillar is up approximately 21% over the trailing 90 days (Feb 9 close ~$742 → May 8 close ~$897), a textbook gradual sustained move. The catalyst stack is concrete: Power Generation sales jumped 44% in Q4 2025, and CAT committed to a 2GW generator contract for a West Virginia data center — one of the largest single power solution contracts in its history. Q1 2026 earnings confirmed the trend, with CAT signing an $840M Atlas Energy agreement and a Microsoft-Nvidia collaboration for a 1.35GW West Virginia infrastructure project targeted for late 2027 deliveries.

The caveat: analyst consensus sits at $865.83 (15 buy, 10 hold, 3 sell), implying roughly 3.5% upside from current prices. The Street has broadly repriced CAT's Power & Energy segment — what's arguably not yet fully modeled is EPS re-acceleration as the $51B backlog converts through 2027-28. At this stage CAT reads as a confirmed re-rating with limited near-term consensus-target upside but an unfinished earnings revision cycle.

CMI: The Cleanest Underappreciated Setup

Cummins is the most nuanced name. Its 90-day price action is net negative (~-8%, $742 → ~$682) due to a $199M Q1 2026 charge from the Accelera fuel-cell divestiture and truck-market softness — yet underneath, Power Systems is running at the highest margins in the company's history. CMI's Power Systems segment posted record Q1 2026 EBITDA of $577M at a 29.5% margin, representing nearly 39% of total adjusted EBITDA despite being only 23% of revenue. Cummins raised its full-year 2026 revenue guidance to +8–11% (from +3–8%) and EBITDA margin guidance to 17.75–18.5%, explicitly citing data center power generation demand.

Data-center-related revenue reached approximately $3.5B in 2025 (up from $2.6B in 2024), backlog extends into 2028, and active 2029 conversations are underway — with 95-liter engine capacity doubled ahead of schedule. North America power generation revenues increased 23% in Q1 2026.

The complication: consensus PT sits near $643 versus a share price around $660–682, meaning the Street's blended view is roughly "fairly priced" after CMI's near-doubling over the prior year. CMI's forward PE of 24.2x versus trailing 35.3x suggests the 2026 earnings power (consensus ~$28.19/share, 2027 ~$32.53/share) is not yet fully embedded in multiples if the truck cycle recovers alongside Power Systems growth. A May 21 Analyst Day is flagged to update long-term financial targets — a potential re-rating catalyst.

GNRC: Big Move, Shrinking Upside

Generac is the clearest data point for the hypothesis's "weakening" flags. The stock is up approximately 89% YTD 2026, with commercial data center backlog surging from $400M to $700M in under 90 days, two hyperscaler pilot-phase partnerships confirmed, and 2026 revenue guided to mid-teens growth. Q1 2026 C&I sales rose 28%, and domestic large-megawatt generator capacity is expected to surpass $1B by Q4 2026.

But the momentum has largely been captured. Consensus PT is approximately $270–272 versus current prices near $267 — though UBS raised its target to $305 (May 5) and Stephens/Argus targets sit at $290. The bull case now depends on select top-end targets, not the consensus. GNRC reads as a graduated mover whose gradual phase is largely complete.

The Rest of the Cohort

IPPs (VST, CEG, TLN, NRG): All confirmed hyperscaler PPA holders. VST holds 20-year AWS and Meta PPAs for 3,800+ MW combined; CEG holds a 20-year Microsoft TMI restart deal and a 1.1GW Meta nuclear deal; TLN provides 1,920 MW of nuclear power to Amazon through 2042. The four merchant IPPs produced a combined 71% average return in the first 9 months of 2025 alone — these are violent multi-year runs, not 30-90 day gradual movers. PJM capacity auction structurally validates the revenue floor at $329/MW-day with data centers representing ~45% of the last three auction's $47.2B total costs, but valuation has run ahead of the gradual-follower framework. NRG's 13GW LS Power acquisition at 7.5x EV/EBITDA adds capacity but hasn't yet closed the valuation discount to peers.

BWXT: Q1 2026 beat with 77% YoY backlog growth to $8.65B and a $1.4B Naval Nuclear Propulsion Program award on May 7 keep sell-side constructive — Globe and Mail notes BWXT's commercial segment backlog entered 2026 at $1.7B, up 85% YoY. But a 55x trailing PE, flat 90-day price action (~$203 → $205 with a peak-to-current drawdown of ~14%), and defense/naval anchor rather than commercial gas-turbine/BTM profile place BWXT outside the core narrative. A Yahoo Finance comparison notes BWXT's forward sales multiple of 4.96x as more attractive than speculative pure-play SMR names, but the stock is in post-run consolidation.

MHI (7011.T): Down ~9% over 90 days, reflecting JPY headwinds and non-participation in AI capex thematic at the stock level.

BE (Bloom Energy): ~+68% in 90 days ($155 → $261 with a $298 peak), a classic parabolic excluded by the hypothesis criteria.

Structural Backdrop

GEV remains the benchmark leader at +65% YTD with orders placed today not delivering until 2028 — confirming multi-year gas-turbine slot scarcity is structural, not cyclical. The mid-tier gradual movers like CAT and CMI are benefiting from the same demand wave with a valuation lag, while GNRC has largely closed its discount. The May 21 CMI Analyst Day is the next near-term event that could reframe whether Power Systems warrants a standalone re-rating discussion.