Why Intel, TSMC are building water-dependent chip plants in Arizona

The biggest semiconductor manufacturers in the world are quickly trying to build new factories as the global chip crisis continues to wreak havoc on a plethora of industries.

U.S. semiconductor giant Intel announced in March that it plans to spend $20 billion on two new chip plants in Arizona. Separately, TSMC (Taiwan Semiconductor Manufacturing Company) said it was going to build a $12 billion factory in Arizona, and chief executive C.C. Wei said Wednesday that construction had already begun.

The Grand Canyon State may not, however, seem like the most obvious place for a chip “foundry” or “fab” since the high-tech manufacturing plants guzzle millions of gallons of water every day.

At present, in the face of climate change, Arizona is facing a deepening water crisis and some of the state’s all-important aquifers have an uncertain future.

Arizona received just 13.6 inches of rainfall on average per year between 1970 and 2000, according to the NOAA National Climatic Data Center, making it the fourth driest state nationwide. Conversely, Hawaii and Louisiana recorded the highest levels of average yearly precipitation in the U.S. over the same time frame, reporting 63.7 inches and 60.1 inches, respectively.

“Water is a key element in semi manufacturing, but the infrastructure has been put in place [in Arizona] to ensure adequate supply to meet the industry’s current needs,” Alan Priestley, vice president analyst at tech research firm Gartner, told CNBC.

A key consideration of any new construction would most likely be contributions to enhancing the water supply infrastructure, he added.

Glenn O’Donnell, vice president and research director at analyst firm Forrester, told CNBC that chip fabrication plants “recycle water religiously,” adding that it’s a bit like a swimming pool in an enclosed building.

“You need a lot to fill it, but you don’t have to add much to keep it going,” he said. “Also, being in an enclosed space, a lot of the water that evaporates can be captured with a dehumidifier and returned to the pool. The fabs will do similar things with their own water usage.”

Intel notes on its website that it is striving to achieve “net positive water use” in Arizona and that it has funded 15 water restoration projects that aim to benefit the state. “Once fully implemented, these projects will restore an estimated 937 million gallons each year,” the company says.