Cummins' diesel flywheel meets a gentler EPA glide path
Record power-gen demand and a newly clarified 2027 transition raise guidance again — but the stock sits ~19% below its June high.
CMI · Earnings Call · 2026-08-04
Cummins turned in another record quarter and raised full-year guidance for the second time in three months, but the more interesting shift is structural: the data-center power boom is broadening into China, and the EPA's long-pending 2027 emissions rule finally landed as a flexibility-rich proposed rule that converts a feared demand cliff into a staged, smoother ramp. The tape, however, remains skeptical — the stock sits about 19% below its late-June high despite the raised outlook.
The data-center flywheel keeps spinning
Power Gen is the engine of the story. Record Q2 sales of $9.5 billion (+9% yoy) and record EBITDA of $1.7 billion (17.5% of sales) were driven overwhelmingly by power-generation demand — North American power-gen revenues grew 19%, and China was the upside surprise, with data center market demand pushing China power-gen equipment sales up 88% and total China revenue including JVs up 30%. Visibility is remarkable: a new multiyear agreement with a global hyperscaler secures several gigawatts of future backup-genset demand.
If you want a new one, it's going to be the second half of 2028.
That lead-time extension — from "well into 2028" in February to "second half of 2028" now — shows the order book still stretching. This is a broad sectoral wave: across last week's earnings reporters, Nidec, LS Electric, Enlight and SoftBank all flagged AI data-center demand, and the global keyword trajectory shows global hyperscaler as a market-wide theme. Cummins' differentiation is the diesel-backup installed base and the capacity it is racing to add — while seeding the next leg via the new natural gas generator and the prime power market, developing a 130-liter genset. The strength is also broad-based geographically, with Southeast Asia export demand a notable contributor. Still, Jen keeps expectations grounded: “Still the predominant revenue for power gen this decade is going to be diesel standby.” — Jennifer Rumsey, Chair and Chief Executive Officer · 2026-08-04
EPA 2027: the cliff becomes a glide path
The genuinely new element this quarter is regulatory clarity. As recently as February, Jen described the climate bluntly: “it is quite unusual to have this level of uncertainty, this close to a regulatory implementation date” — Jennifer Rumsey, Chair and Chief Executive Officer · 2026-02-05. By May, the company was committed to moving forward with X15 and X10 while awaiting the draft rule. Now the proposed rule is out, and Cummins has announced a phased transition — limited production of the new X15 and X10 engines in January 2027, ramping to full output through 2027, with the next-gen B platform launching January 2028 and the current B available all of 2027. “We continue to plan to move forward with X15 and X10 in '27.” — Jennifer Rumsey, Chair and Chief Executive Officer · 2026-05-05“While we would expect some moderation in demand next year… it will not be as abrupt as we might have previously anticipated.” — Jennifer Rumsey, Chair and Chief Executive Officer · 2026-08-04
This materially de-risks 2027: the old fear was a violent pre-buy followed by a demand hole; the new reality is an even demand curve with OEM launch timing staggering the ramp, letting Cummins gather field experience on the new HELM platforms before volumes step up. Management also confirmed nonconforming penalties will be passed through to the market, and warranty costs — at historic lows near 2% of sales — will tick up with the launches before normalizing.
Margins, incentives, and a cool tape
Q2 margin optics were muddied by a one-time top-up in incentive compensation tied to record full-year expectations. Mark quantifies the reset next year at roughly “$200 million” — Mark Smith, Chief Financial Officer · 2026-08-04, with the second-half run-rate about $25 million lower per quarter than Q2. Distribution margin guidance was trimmed for the same reason plus mix, and the prior quarters' Low pressure Fuel Cell business write-downs continue to simplify the portfolio. Notably, while IEEPA refund is a top market-wide theme this quarter, Cummins stated “The net impact of tariffs was immaterial to EBITDA dollars in the quarter” — Mark Smith, Chief Financial Officer · 2026-08-04 — a reminder that its U.S.-heavy manufacturing footprint insulates it from the refund circus.
The numbers confirm the story. Revenue is compounding, Power Systems EBITDA margins hit 24.5% (from 22.8%), and Price to Revenue is now 2.2x, up ~70% yoy. That re-rating, even with the stock ~19% off its June peak, suggests the market underwrites the data-center thesis but remains cautious on the 2027 transition and how quickly capacity can actually be delivered. The tension between record fundamentals and a cooling tape is the key thing to watch into the second half.