It’s their vision for how urban data center development can be done sustainably — and not at the expense of their cities’ natural resources, energy prices or climate targets. C40 Cities, an alliance of nearly 100 cities seeking to impact climate change, launched it during London Climate Action Week.

Many new data centers are coming to rural areas for cheap land. Experts at C40 say metropolitan areas are under tremendous pressure too, with about 1,700 data centers located in their network of cities so far. Development of data centers is expected to grow by over 40% in 50 of those cities.

C40 got involved because the mayors of Phoenix and Melbourne, Australia, came together over worries about data centers using a lot of their cities’ electricity and water, and competing with housing developers for available land.

“We found out that the challenges in every region around the world were very similar,” said Cassie Sutherland, a managing director at C40. “Our approach was to say OK, how do we now use a global mayoral voice to come together with the conditions under which they will accept data centers.”

Data centers are built in cities to be close to firms that want systems powered by artificial intelligence to respond instantaneously. Major companies locate data centers in cities to be near their business operations. And data centers tend to be built in clusters, forming ecosystems in metropolitan areas that might outweigh factors like land costs. It’s just more recently that data centers have moved out into rural areas, said Andrew Batson, global head of data center research at JLL.

Political and local opposition has been growing because of fears about blackouts, rising electricity bills and the centers’ voracious water needs. Some states are suspending tax breaks or considering moratoriums on data center construction.

The pact focuses on choosing sites, clean energy, affordability and community engagement

About half of participating mayors are from the U.S. That includes Seattle and the California cities of Palo Alto and Riverside. In the Southwest, Phoenix and Albuquerque, New Mexico, joined. On the East Coast, Beverly, Massachusetts, signed, as did Lincoln, Nebraska; Chicago and Cleveland in the Midwest and Miami in the South.

European cities in Greece, Spain, Italy, Germany, the United Kingdom and Norway joined, as did Montreal in Canada. The pact includes African cities in Ivory Coast, Sierra Leone, South Africa and Kenya, as well as Asia-Pacific cities in India and Australia, and Lebanon in the Middle East.

Sutherland said their vision needs to be translated into action, with each city using it as a framework for their own regulations or guidelines. Mayors are limited in what they can do unilaterally, so they’ll need buy-in from other government officials, utilities and the private sector.

The pact lists several standards for data center developments. Urban data centers should be built on abandoned or underutilized land in an area that minimizes negative impacts on noise, heat and air pollution. Developments should be fueled by renewable energy and battery storage, and data centers should reduce water use and emissions, as well as capture waste heat.

And, the mayors want data centers that create jobs, buy local goods and services, pay for their own infrastructure upgrades and listen to community feedback.

Phoenix is in the top 10 for data center markets in North America

The Phoenix metropolitan area has pending permit requests that would double the electricity demand if all of these data centers were built. Developers are drawn there for its reliable power and predictable weather.

Phoenix Mayor Kate Gallego said she’s concerned that investments in data centers right now are worsening climate change and not meeting the needs of communities. Mayors are forming a unified front to help improve data centers everywhere — that will keep developers from simply looking for communities unable to advocate for their own benefits, she added.

“We understand the importance of this innovation, it’s creating great jobs in our community,” Gallego said. “We just want to make sure that we get it right for our local residents and for the health of our planet.”

Southeast Asia wants to be a data center hub

As of Tuesday, none of Southeast Asia’s cities endorsed the pact. Several said they couldn’t because of national policies or other complications, but the conversations are ongoing, C40 said.

The region accounts for a quarter of global energy demand growth, partially driven by more than 2,000 data centers in Indonesia, Malaysia, Singapore, Thailand, Vietnam and the Philippines, according to the think tank Ember.

The annual energy demand from these data centers will more than double in the next five years, the International Energy Agency said. This is most evident in Malaysia, which has drawn investments and interest from tech giants like Microsoft, Google and Nvidia.

Data centers add to Melbourne’s water concerns

If Melbourne follows through on all its plans, data centers will annually consume up to 20 billion liters (5.3 billion gallons) worth of water, or about 4% of the drinking water supply, according to the city’s Lord Mayor Nicholas Reece.

The water supply is already strained by the growing population, longer dry periods and more extreme heat driven by climate change.

Melbourne played a key role in the pact. Reece said stricter environmental regulations there likely won’t threaten future plans. Ultimately, he said, data centers are going to go where there’s enough power and land, and where they’re close to the markets and companies using artificial intelligence.

“We don’t want to see a race to the bottom between cities where governments, desperate for investment, are chasing data centers on any terms possible,” he said. “We want to see a better framework in place so that the investment rush in data centers can be a win-win — a win for investors and also a win for local communities.”

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