Data Center Construction Spending Jumps 90% in a Year to $96 Billion

Data center construction spending hit a seasonally adjusted annual rate of $96 billion in September, up 8.6% from August and up 90% from a year earlier, according to Census Bureau data. Since the start of 2021, the annual spending rate on data centers has climbed 950% — a near-exponential curve that shows no inflection point yet.

Wolf Richter, writing for Wolf Street, put the mechanism plainly: "Nothing that needs to be funded can grow on an exponential curve for long. But the inflection point imposed by capital constraints hasn't come yet." The big 12 AI companies have already raised more money than they're spending, building an unused cash pile of $1.1 trillion in cash and equivalents — a war chest they can draw on even if markets turn hostile to new fundraising. Local resistance from residents, municipalities and state governments has delayed individual projects but hasn't slowed overall growth.

What are the boom's neighbors doing?

Power and factory construction are growing alongside it, and the numbers matter if you work in industrial supply chains:

• Power plant and distribution construction rose 0.9% in September from August, and 11.1% year-over-year, to an annual rate of $192 billion — up 63% since the beginning of 2021.
• Factory construction has held roughly flat for three months at an annual rate of $170 billion, still 128% above the start of 2021 and 76% higher than data center spending.

One caution on definitions: construction figures cover only buildings, site improvements and built-in systems like HVAC. The expensive part — servers, racks, networking gear, electrical equipment and often onsite generators — sits outside these numbers. Construction spending is therefore a leading indicator: today's buildings are tomorrow's orders for the equipment that fills them.

Where is the demand showing up?

The shockwave is already visible in Census Bureau orders data for September. Core capital goods orders — durable goods excluding defense and aircraft — spiked 10.4% year-over-year to $88 billion.

Machinery orders jumped 16.1% year-over-year to $46.0 billion. That category, NAICS code 333, spans engine and power transmission equipment, HVAC and refrigeration, construction and mining machinery, industrial machinery, metalworking machinery and general-purpose machinery — "data centers, power plants, and factories written all over it," as Richter noted.

Computer and electronic products orders rose 16.6% year-over-year to $31 billion, including orders placed at US-located semiconductor fabs. That NAICS 334 group covers computers and peripherals, semiconductors, communications equipment, and measuring and control instruments.

If you're in manufacturing, these order books translate directly into overtime, hiring and pricing power in exactly these segments.

What about construction costs?

The boom is feeding a second wave of construction inflation. The Producer Price Index for construction materials — steel mill products, concrete, lumber, gypsum — rose 11.0% year-over-year in September, per the Bureau of Labor Statistics. The PPI for nonresidential construction services, covering trade, transportation, warehousing, architectural engineering and legal services, spiked 14.0%. Contractors and their clients are absorbing input costs rising at roughly triple the pace of consumer inflation.

Factories add a long-term payoff, too: once built and equipped, they contribute to production and employment for decades, not just during the construction phase.

With $1.1 trillion in idle AI cash still waiting to be spent, the demand signal for equipment makers and construction trades points upward for now.