Microsoft Sends Internal Memo to Employees on AI Data Centre Impact

Microsoft has acknowledged internally that the rapid expansion of AI data centres is making it harder to meet some earlier emissions commitments, as employees raise concerns about energy use, water consumption, emissions and the impact on local communities.

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Employees Question Impact of Data Centre Growth

Noelle Walsh, head of Cloud Operations and Innovation at Microsoft, addressed the concerns in an internal memo to employees reviewed by Bloomberg. Walsh acknowledged that the growth of AI is making it more difficult for Microsoft to achieve some previous commitments on emissions.

The internal discussion comes as Microsoft continues to expand its data centre infrastructure to support growing demand for AI and cloud services. Employees have been asking about the power and water required by these facilities, their carbon emissions and their effect on communities where new data centres are being built.

Microsoft has previously reported that its total carbon emissions increased as it expanded its data centre infrastructure. The company continues to work towards its longer-term sustainability commitments while managing the resource requirements of AI growth.

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Microsoft Points to Efficiency Measures

Walsh also pointed to improvements in the way Microsoft designs and operates its data centres. The internal message said water-use efficiency has improved by nearly 90% compared with the company’s first-generation data centres.

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Microsoft’s published sustainability data also shows a 92% reuse and recycling rate for decommissioned cloud hardware, exceeding its 90% target. The company says it reused or recycled more than 3.2 million components in 2024.

The internal communication also referred to agreements for up to 40 gigawatts of renewable energy. Separately, Microsoft’s sustainability reporting says it matched 100% of its annual global electricity consumption with renewable energy.

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Key points:

• AI growth is increasing demand for data centre capacity and resources.
• Microsoft acknowledges that AI expansion is making some earlier emissions commitments harder to achieve.
• Water-use efficiency has improved significantly compared with Microsoft’s early data centres.
• Microsoft reports a 92% reuse and recycling rate for decommissioned cloud hardware.

Sustainability Becomes an Employee Issue

The discussion is significant for employers because the environmental impact of major technology investments is also being questioned by employees.

Microsoft’s internal memo shows that sustainability concerns are not limited to external stakeholders and can also become part of employee discussions about the company’s business decisions.

For technology companies, the challenge is to expand computing capacity for AI while continuing to address energy, water, emissions and community concerns.

Microsoft’s latest communication reflects the difficulty of balancing these requirements as demand for AI infrastructure continues to grow.