Micron Boise Fab (ID1)

The first new memory-chip fab to break ground on U.S. soil in two decades is taking shape on a 720-acre parcel south of Boise. Micron Technology’s $15 billion ID1 facility, the first of two fabs in a planned $50 billion expansion, is the largest single private capital investment in Idaho history and the centerpiece of the U.S. domestic DRAM supply chain that the 2022 CHIPS Act was written to create.

Ground was broken in October 2022. The shell of the first fab is now several stories tall and covers roughly 10 football fields of floorplate. Cleanroom fit-out is the dominant work scope through the back half of 2026, with the first wafer starts targeted for 2027 and production ramp through 2028. A second fab, ID2, is in early site preparation immediately adjacent.

Project Scope

The ID1 building is a four-level industrial structure: subfab utilities and chemical distribution below grade, ground-floor cleanroom waffle slab, mezzanine for fan filter units and MEP distribution, and a top-floor mechanical penthouse. The cleanroom itself covers approximately 600,000 square feet at ISO Class 3 standards, with the most aggressive vibration criteria on the slab limited to VC-E (less than 3 micro-inches per second). Achieving that on a building this size required a 12-foot-thick waffle slab cast on 360 driven precast piles tied to bedrock at depths of 40 to 60 feet.

The water and utilities envelope is the more interesting engineering. ID1 will demand roughly 5 to 6 million gallons per day of ultrapure water at full capacity, sourced from city potable supply and processed through an on-site reverse osmosis and ion exchange plant. Idaho Power is building a dedicated 230 kV substation tied directly into the western Idaho transmission ring. A 280 MW process-cooling plant rejects waste heat through a hybrid wet-dry cooling tower stack that holds maximum evaporative water use under 1.4 million gallons per day, a binding condition in Micron’s Idaho Department of Water Resources permit.

Steelwork totals roughly 28,000 tons. The cast-in-place concrete program is approximately 220,000 cubic yards. At peak, the project carries about 6,000 trades workers on site under the Yates / Layton joint venture, which is running the work as a construction manager at risk under a guaranteed maximum price with shared savings.

Why It Matters

Memory is the leg of the semiconductor industry that the CHIPS Act paid least attention to until late in the drafting cycle, and it’s the segment with the largest geographic concentration risk. Roughly 75% of global DRAM production sits in two countries (South Korea and Taiwan), and the high-end HBM stacks that NVIDIA’s data center GPUs depend on are concentrated even more tightly. ID1 doesn’t fix that single-handedly. It does give the U.S. a meaningful production anchor for leading-edge DRAM and the HBM packaging that gets stacked on top of it.

The fab is also the project Idaho built its economic-development case on. Micron has committed to roughly 2,000 direct fab jobs and an additional 15,000 supply-chain and construction jobs over the buildout. The state passed a manufacturing-investment tax credit specifically calibrated to keep Micron’s effective incentive package competitive with Texas and Arizona, where TSMC and Samsung are running similar-scale fabs with state-level subsidies. The federal CHIPS direct funding award to Micron totals $6.1 billion across the Idaho and New York sites, with a roughly $2.4 billion allocation tied to ID1 milestones.

For the Boise market the build is reshaping construction labor pricing across the Treasure Valley, with wage premiums of 15 to 22% over baseline regional labor rates on competing projects. That distortion will fade as ID1 hands off to ID2 and the cleanroom workforce transitions from construction trades to Micron’s operations head count. By 2028 the project becomes a manufacturing tenant rather than a megasite, and the second fab’s schedule will tell the rest of the story.

Project Team & Details