The quiet backbone of the AI economy

Every headline about artificial intelligence eventually runs into a data center. That is where the models train, where the queries get answered, and where the electricity bill gets paid. Data center stocks are the companies that build and power that physical layer, and they span three distinct jobs: generating electricity, cooling the hardware, and housing it safely. The Angel Publishing Homestacks presentation names one stock from each corner, which makes it a useful tour of the whole category.

What separates data center stocks from the chip names that dominate the AI conversation is the earnings profile. A chip designer lives and dies on each product cycle. A data center supplier sells the same gear and the same power whether Nvidia, AMD, or someone else wins the next round. That is the attraction, and it is why the category keeps drawing attention.

Three jobs, three names

The Homestacks report points to three companies, each in a different part of the buildout. nVent Electric (NVT) handles enclosures and housings, the cabinets and cooling infrastructure that protect servers and electrical equipment. It trades near $152 with a market value around $24.6 billion, and data centers now make up roughly 40% of its revenue, which is the deepest data-center mix of the three. The stock is up about 100% over the past year.

Generac Holdings (GNRC) is the backup and resiliency name. Known for home generators, it has built a data-center backup-power backlog of about $700 million. It trades near $206 with a market value around $12.2 billion and roughly 20 times forward earnings. Vistra Corp. (VST) generates the power itself, mostly in Texas, and trades near $136 with a market value around $45.7 billion and about 13 times forward earnings. That spread of multiples is the first thing to understand about the category.

Why the multiples diverge

The three prices reflect three different risk profiles. Vistra is the cheapest because power generation is capital-heavy and weather-exposed, even with 15% to 20% earnings growth expected. nVent carries the highest multiple because its enclosure franchise is steadier and its data-center exposure is the largest. Generac sits between them, with growth expected to slow to about 20% a year in 2027 and 2028 and the stock down roughly 45% from its high.

None of these is a speculative valuation, and that matters. This is a category where you are buying cash flow first and the AI story second. Our data center stock walkthrough digs into that mix.

The Homestacks twist

The presentation’s twist is a device it calls a Homestack, an outdoor appliance about the size of an air-conditioning compressor. The real product is SPAN’s XFRA unit, which combines NVIDIA Blackwell GPUs, roughly $150,000 or more of equipment per unit, with a smart electrical panel and a home battery. SPAN installs the panel and battery free and covers the host homeowner’s power and internet, while the first pilot runs about 100 units in build-to-rent communities in Arizona and Nevada with PulteGroup.

The idea is clever, and SPAN has raised roughly $500 million plus a $75 million strategic investment from Eaton. But it is a pilot, and it has little bearing on the fundamentals of nVent, Generac, and Vistra. Those three ride the conventional buildout. The frontier AI data center buildout is where their actual growth comes from.

Reading the three picks straight

The fair summary is simple. These are real, liquid businesses with genuine data-center exposure and sane multiples, and the Homestacks story is an interesting layer on top rather than the engine. Buy them for the buildout thesis, not for a 100-unit home pilot. Vistra is the hedge of the group, winning whether the buildout accelerates or stalls, and our overview of the AI data center stocks puts all three side by side.

Why power and cooling decide the winners

The reason data center stocks keep compounding comes down to two physical constraints. The first is power. A single modern AI campus can draw electricity on the scale of a small city, and most grids cannot hand over that much load without years of new transmission and generation. The second is heat. As chip racks get denser, they throw off more heat than traditional air cooling can handle, and each new generation of GPUs makes the problem worse.

Those two constraints are the quiet engine of the whole category. Operators have to buy enclosures that manage airflow and protect equipment, which is nVent’s job. They have to buy backup generation so a grid failure does not take down an entire campus, which is Generac’s job. And they have to secure generation and long-term contracts, which is Vistra’s job. The promo’s “$7 trillion data center empire” headline is a way of describing that cumulative spending, the hyperscale campuses big tech has funded for years.

The useful insight is that the three picks map cleanly onto the constraints rather than onto the Homestack device itself. Whether the buildout stays centralized or drifts toward home appliances, the same three spending buckets, housing, backup power, and electricity, keep getting funded. That is the durable part of the thesis, and it is the reason a balanced set of three names makes more sense here than a single-stock moonshot.

Ready to see the research? Click here to access the Angel Publishing report.

NewsletterVetter is an independent publication. We receive compensation from some of the services we review through affiliate links. Nothing on this site is investment advice. Always do your own research.