Shares of Generac Holdings vaulted 16.5% to $204.00 in after-hours trading September 16, defying a session in which the S&P 500 fell 0.45% following a Federal Reserve rate hike. The catalyst: fresh coverage spotlighting a $1.6 billion order backlog for data-center backup generators and a $250 million factory expansion plan — numbers that frame the most aggressive industrial pivot in the company's history.
• The Backlog Has Quadrupled in Under a Year, and That's the Whole Bull Case. Generac's data-center backlog stood at just $400 million at year-end 2025, then jumped to $700 million by its March Investor Day.
It now sits at $1.6 billion, and the company expects to add about 1,000 workers — a 10% increase in headcount. That trajectory gives the stock a growth story its old residential-generator business never provided. Management already raised full-year 2026 data-center revenue guidance to $450 million , but with a backlog more than three times that figure, investors are pricing in years of shipment visibility.
• The $250 Million Bet Requires Flawless Execution. Generac will invest $250 million by the end of next year to expand large generator production. That's a big check for a company carrying $1.33 billion in debt at a gross leverage ratio of 1.5 times adjusted EBITDA. It's also racing against equipment lead times that already stretch 18 to 36 months and alternator supply constraints management flagged as the most acute near-term bottleneck. If capacity doesn't come online on schedule, the backlog becomes a backlog problem.
• The Market It's Chasing Is Enormous — and Crowded. Wood Mackenzie projects the U.S. data-center electrical equipment market will surge from $20 billion to $65 billion by 2030.
CEO Aaron Jagdfeld has acknowledged that Caterpillar and Cummins are already so dominated by generator demand that they now resemble power companies more than equipment makers. Generac is the newcomer here, and winning share depends on converting its hyperscale supply agreement — widely linked to the Stargate AI data-center project involving OpenAI, Oracle, and SoftBank — into repeat business.
• The Q2 Numbers Back the Story, With a Caveat. Q2 net sales hit $1.17 billion, up 11% year over year , while C&I (commercial and industrial) revenues surged 29% to $556.5 million. But investors should note that tariff refunds added roughly $0.90 per share to earnings , flattering the headline $2.91 adjusted EPS beat. Strip those out, and the underlying profit improvement is solid but less dramatic. At $204, the stock remains well below its 52-week high of $296.44 — meaning the market still sees plenty of execution risk ahead.