Generac shares surge 35% after securing up to $8 billion Amazon data‑center backup power deal

Generac Holdings disclosed a multi-year agreement to supply backup generators for Amazon's data centers, and GNRC jumped in extended trading on Wednesday evening. The reported size of the move ranges from 25% to 45% across outlets, with the more precise figures clustering around 33% to 34%. This was an after-hours move only: SentiSense's own feed shows the regular session closed flat at $175.11, so the repricing has not yet passed through a full trading day.

The commercial terms are in Generac's 8-K. Amazon commits to an initial $2.4 billion of generator deliveries across 2027 and 2028, with the overall relationship capable of expanding to as much as $8 billion.

The equity component is the part worth reading closely. Amazon received warrants for 1,693,745 Generac shares, about 3% of the company, at a strike of $200.9266, expiring on September 16, 2033. That strike sits roughly 15% above Generac's $175.11 close, so Amazon only profits on the warrants if the contract itself re-rates the stock, which aligns the customer with the supplier rather than simply discounting the purchase. Extended-hours quotes ran past $240 and settled near $234.33, already above the strike.

The strategic read is that AMZN is treating grid-independent backup power as a constraint on data-center buildout worth locking in years ahead, and Generac is the counterparty. For a company whose backup-power business has been driven by residential storm demand, a named hyperscaler contract of this size changes the revenue mix rather than just adding to it. The dated checkpoints are the first deliveries in 2027, whether Amazon exercises the warrants, and any expansion beyond the initial $2.4 billion commitment.