40 City Mayors Unite to Regulate Rapid Expansion of AI Data Centres Straining Power and Water

City Mayors Confront Growing Pressure from AI Data Centres

Mayors from 40 cities spanning four continents have signed the Global Urban Data Centres Pact, marking the first coordinated global effort by city governments to regulate rapid expansion of AI data centres 1

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. Launched during London Climate Action Week, the pact aims to address the unprecedented data centre burden on power and water resources as AI-driven computing demand triggers trillions of dollars in new infrastructure investment 1

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. Cities from London to Phoenix and Melbourne are experiencing what Melbourne Lord Mayor Nicholas Reece describes as "the biggest thing to hit the energy grid since air conditioning in the 1950s," except this transformation is unfolding in a few short years rather than decades 1

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Environmental and Infrastructural Strain Reaches Breaking Point

The AI data centre surge is placing extraordinary demands on urban infrastructure. In Melbourne, approximately 50 major data centres already operate, projected to account for roughly 10% of local power demand by 2030 and as much as 20% by 2040 in a city of 5.5 million people 1

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. Water consumption presents an equally stark challenge, with these facilities expected to use around 20 billion litres annually, equivalent to 4% of Melbourne's drinking water supply 1

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. Phoenix faces similar pressures, with 225 existing or planned data centres and proposals that could double the city's electricity demand 1

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. Phoenix Mayor Kate Gallego noted that utilities experiencing decades of steady demand now face growth in a few years comparable to the previous century, driven largely by AI-related computing needs 1

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Standards for Clean Energy Use and Resource Efficiency

Coordinated by C40 Cities, a network of nearly 100 of the world's biggest cities working on climate action, the pact establishes specific standards to ensure clean energy use and resource efficiency 1

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. AI data centres must be built on abandoned or underused land, powered by renewable energy and battery storage, and required to reduce water consumption, cut emissions and capture waste heat 2

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. The framework guides permitting and planning decisions while addressing land use conflicts with housing developers. About 1,700 data centres already operate across C40's network, with development expected to grow by more than 40% in 50 cities 2

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. Data centres account for an estimated 2.5% to 3.7% of global greenhouse gas emissions, according to the World Economic Forum, exceeding aviation's footprint 1

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Urban Integration of Data Centers and Community Benefits

The pact addresses the unchecked expansion of AI infrastructure by requiring meaningful community benefits and better urban integration of data centers 1

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. Facilities must create local jobs, source goods and services locally, fund their own infrastructure upgrades and engage with communities 2

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. Investment is happening at "breakneck speed," outpacing environmental regulation and leaving cities at risk of a "race to the bottom" as governments compete for investment while bypassing environmental scrutiny, Reece warned 1

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. Disputes have centered on noise, land use and safety risks from battery storage, alongside concerns about infrastructure in residential neighbourhoods 1

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. London Mayor Sadiq Khan emphasized that while AI and digital infrastructure will play "a major role in the future prosperity of cities around the world," residents expect growth to be managed responsibly 1

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Global Reach and Notable Absences

About half the 40 signatories are US cities, including Seattle, Chicago, Miami, Phoenix and Palo Alto, alongside European cities from Greece, Spain, Italy, Germany, the UK and Norway, plus cities in Canada, Kenya, South Africa, Sierra Leone, Côte d'Ivoire, India, Australia and Lebanon 2

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. Notably absent are Southeast Asian cities, despite the region accounting for a quarter of global energy demand growth and hosting more than 2,000 data centres across Indonesia, Malaysia, Singapore, Thailand, Vietnam and the Philippines 2

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. Several cities could not sign because of national policies or complications, though C40 Cities said conversations continue . The signatories are betting that a unified front changes the calculus, preventing developers from seeking cities too weak to demand better standards 2

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