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Generac backup generator installed at a commercial data center facility
Photo: The Motley Fool

Generac Stock Jumps 33% on $8B Amazon Data Center Deal

SEC / Generac Holdings2 min read5 sources

Why is Generac stock up today?

Generac (GNRC) stock rose 33% to $233 on Thursday after the generator maker signed an $8 billion backup-power supply agreement with Amazon for data centers, its biggest contract ever.

Key numbers

GNRC 1-Day Move+33%best single-day gain on record
Initial Deal Value$2.4Bcommitted deliveries in 2027–28
Total Deal Potential$8Bmaximum aggregate through 2033
Amazon Warrant1.69M shares~3% of GNRC shares at $200.93 exercise price
Market Cap Gained+$3.5Bfrom ~$10.3B to ~$13.8B intraday
GNRC TTM Revenue$4.44B+0.6% YoY

What happened

Generac (GNRC) stock rose 33% to $233 on Thursday after the generator maker signed an $8 billion backup-power supply agreement with Amazon for data centers, its biggest contract ever. Generac will deliver $2.4 billion worth of backup generators to Amazon data centers in 2027 and 2028, with total purchases potentially reaching $8 billion by 2033. As part of the deal, Generac issued Amazon a warrant to buy up to 1.69 million shares at $200.93 each — about 3% of shares outstanding — with vesting tied to cumulative purchase milestones through 2033. The session was Generac's best single-day gain on record, lifting its market value from roughly $10.3 billion to about $13.8 billion in one trading day.

Why it matters

Generac has long been known as a consumer brand — the company that sells backup generators for homes after hurricanes knock out power. This deal flips that picture: the $8 billion Amazon commitment transforms Generac into a critical supplier to AI infrastructure, in the same category as chip makers and power-grid builders. AI data centers need reliable backup power at a scale that ordinary cloud computing never required, and Generac's new status as Amazon's primary generator supplier puts it at the centre of a spending wave that is just beginning.

Who this affects

Marketbullish
Medium impact
Rival generator stocks gained on strengthened AI power-demand thesis.
Companybullish
High impact
Generac market value surged $3.5 billion on record trading volume.
Competitorsbearish
Medium impact
Caterpillar and Cummins face pressure to win comparable hyperscale contracts.
Industrybullish
High impact
Generator makers repositioned as essential AI infrastructure providers.

Generac vs Caterpillar, Cummins, Eaton

GeneracGNRC:NYSE$13.8B+33%+71%20x
CaterpillarCAT:NYSE$393B—+53%28x
CumminsCMI:NYSE$87B—+30%—
EatonETN:NYSE$152B———

As of 2026-09-17

How we got here

  1. Generac acquires Allmand, expanding mobile power equipment for C&I markets.

  2. Generac acquires Enercon, adding generator enclosure and switchgear capacity.

  3. Generac and Amazon sign $8B backup-power supply agreement and warrant deal.

  4. GNRC closes +33%, its best single-session gain on record.

What to watch

  • Q3 2026 earnings: first results with expanded data-center backlog context.Q4 2026
  • Additional hyperscale deals: Generac near vendor approval with other cloud providers.Q4 2026
  • Amazon warrant vesting: tied to $2.4B in 2027–28 generator delivery milestones.2027-01-01

Educational content only. Not investment advice.

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