LONDON, June 23 (Parliament Politics Magazine) – Mayors from 40 major cities including London, Phoenix and Melbourne have united to address the intense pressure that the rapid expansion of data centres is placing on local power grids and water supplies.
City leaders formally launched the Global Urban Data Centres Pact during London Climate Action Week on June 23, 2026, to standardize how these facilities are integrated into urban environments.
This international coalition aims to establish clear rules for permitting and planning, ensuring that new tech infrastructure prioritizes clean energy and operates with greater resource efficiency. The initiative serves as a framework for cities to negotiate effectively with technology companies and national governments, preventing what leaders described as a race to the bottom where jurisdictions might bypass environmental scrutiny to attract investment.
Infrastructure Facing Unprecedented Demand
The surge in demand for high-speed computing, largely driven by the growth of artificial intelligence, has sparked trillions of dollars in global investment. This expansion has led to community pushback across several regions, including the United Kingdom, the United States, and South Africa.
In Melbourne, Lord Mayor Nicholas Reece highlighted that the city currently hosts approximately 50 major facilities. Projections suggest these sites will account for roughly 10% of local power demand by 2030, potentially rising to 20% by 2040 within a population of 5.5 million people.
“Data centres are the biggest thing to hit the energy grid since air conditioning in the 1950s,” Reece said. “Where the rollout of air conditioning took decades, this is happening in a few short years.”
Beyond electricity, water consumption remains a primary concern for municipal planners. In Melbourne alone, these centres could consume an estimated 20 billion litres of water annually, which represents approximately 4% of the city’s total drinking water supply.
Regulating Rapid Tech Expansion
Cities are currently struggling to manage the pace of development. Phoenix Mayor Kate Gallego noted that the region faces 225 existing or planned facilities, with proposals that could double the area’s total electricity demand. Utilities that once managed steady, predictable growth are now contending with demand spikes comparable to the previous century occurring within just a few years.
This rapid infrastructure build-out has triggered local disputes regarding noise pollution, land use, and potential safety risks associated with battery storage systems. Furthermore, residents have expressed concerns about the placement of such massive industrial infrastructure within residential neighbourhoods.
London Mayor Sadiq Khan emphasized that while digital infrastructure and artificial intelligence are vital for the future prosperity of global cities, local governments must ensure that this expansion is managed responsibly. The World Economic Forum estimates that data centres currently account for between 2.5% and 3.7% of global greenhouse gas emissions, a figure that continues to rise as electricity demand for these sites outpaces overall power consumption.
The pact is coordinated by C40 Cities, a network of nearly 100 of the world’s largest cities focused on climate action. Other notable signatories include Barcelona, Chennai, and Boise. The framework is intended to be flexible, allowing cities to adapt regulations based on their specific climates, as cooling requirements in a city like Manila differ significantly from those in colder environments such as Iceland.
