The proposed M40 SDC data centre campus at Wapseys Wood is a large‑scale digital infrastructure project currently being promoted through a request for a Section 35 Direction, which would allow it to be considered as a Nationally Significant Infrastructure Project (NSIP). The proposal combines a hyperscale data centre campus with an on‑site Energy Centre designed to supply the required electricity.

This article provides a neutral, factual overview of what the Applicant is proposing, how the project is structured, and what the key elements of the development involve. It is intended to help residents and stakeholders understand the proposal without taking a position for or against it.

1. Overview of the Proposed Development

The Applicant (Slough Holdings UK Ltd, part of SDC Capital Partners) is seeking consent to build a major hyperscale data centre campus on the former Wapseys Wood landfill site, located south of Gerrards Cross. The proposal includes:

• A 300MW data centre campus
• A 270–350MW on‑site Energy Centre
• Associated infrastructure such as substations, cooling systems, internal roads, and utilities

The development would occupy a substantial portion of the site and would operate continuously.

2. The Data Centre Campus

The core of the proposal is a cluster of large data centre buildings designed to house servers, networking equipment, cooling systems, and supporting infrastructure.

2.1 Scale and Capacity

The Applicant proposes:

• Up to three hyperscale data centre buildings
• Approximately 300MW of IT load
• Around 240,000 sqm of total floorspace

Hyperscale data centres are significantly larger than typical commercial facilities. They are designed to support cloud computing, artificial intelligence, financial services, and other digital functions that require high levels of processing power.

2.2 Building Components

Each data centre building would include:

• Server halls
• Mechanical and electrical plant
• Cooling systems
• Backup power systems
• Security and monitoring facilities
• Internal substations and switchgear

These components are standard for hyperscale data centres and are required to maintain continuous operation.

2.3 Cooling Strategy

The proposal uses air‑cooling, which involves:

• Large rooftop cooling units
• Continuous airflow
• Heat rejection into the surrounding environment

Air‑cooling is widely used in the data centre industry, though it requires significant mechanical plant and produces a constant thermal output.

3. The On‑Site Energy Centre

A defining feature of the M40 SDC proposal is the inclusion of a dedicated Energy Centre designed to supply electricity to the data centre campus.

3.1 Purpose of the Energy Centre

The Energy Centre is proposed because:

• The electricity grid in West London is heavily constrained
• The Applicant states that no viable grid connection is available in the near term
• The data centre requires a continuous, high‑capacity power supply

As a result, the Energy Centre is intended to operate as the primary power source for the development.

3.2 Fuel Source and Technology

The Energy Centre would be:

• Gas‑fired
• Connected to the high‑pressure gas pipeline beneath the site
• Designed for continuous operation

The Applicant has described the Energy Centre as “decarbonisation‑ready,” meaning it could potentially be adapted for alternative fuels in the future, subject to national infrastructure developments.

3.3 Scale and Infrastructure

The Energy Centre would include:

• Gas turbines
• Generators
• Transformers
• Cooling systems
• Emissions stacks
• Control buildings
• Fuel and safety systems

The scale of the Energy Centre qualifies it as a Nationally Significant Infrastructure Project in its own right.

4. Associated Development and Infrastructure

In addition to the data centre buildings and Energy Centre, the proposal includes a range of supporting infrastructure.

4.1 Electrical Infrastructure

This includes:

• Internal substations
• Transformers
• Switchgear
• Cabling
• Backup systems

These components are required to distribute electricity across the campus.

4.2 Cooling and Mechanical Plant

The development would require:

• Rooftop cooling units
• Air handling systems
• Heat rejection equipment
• Mechanical plant rooms

These systems ensure that server halls remain within operational temperature ranges.

4.3 Roads, Access, and Security

The proposal includes:

• Internal access roads
• Security fencing
• Gatehouses
• Parking and service areas

These are standard features for large data centre campuses.

4.4 Utilities and Drainage

The development would require:

• Water supply
• Wastewater management
• Surface water drainage
• Telecommunications connections

These systems support the operation of both the data centre and the Energy Centre.

5. Why the Applicant Is Seeking a Section 35 Direction

A Section 35 Direction allows a project to be considered as a Nationally Significant Infrastructure Project, meaning it would be examined through the Development Consent Order (DCO) process rather than local planning.

The Applicant’s reasons include:

• The Energy Centre already qualifies as an NSIP
• The data centre is described as being of national significance
• A single DCO would allow the entire project to be assessed together

If granted, the Secretary of State would become the decision‑maker.

6. The Applicant’s Stated Need for the Project

The Applicant presents several arguments for the project’s national importance.

6.1 Growth in Digital Infrastructure Demand

The Applicant states that:

• Demand for cloud computing and AI is increasing
• The UK requires additional hyperscale capacity
• Data centres support essential digital services

These points reflect broader industry trends.

6.2 Location Within the Slough Availability Zone

The site lies within the wider Slough Availability Zone, a cluster of data centres serving the London Region.

Availability Zones are designed to:

• Provide low‑latency connectivity
• Support redundancy
• Enable rapid failover between facilities

The Applicant argues that Wapseys Wood is within the required fibre radius for this zone.

6.3 Economic Considerations

The Applicant highlights potential economic benefits, including:

• Capital investment
• Construction employment
• Operational jobs
• Supply chain activity

These factors are commonly cited in large infrastructure proposals.

7. The Planning and Environmental Context

Large data centre developments involve a range of planning considerations.

7.1 Environmental Impact Assessment

The proposal requires assessment of:

• Air quality
• Noise
• Heat output
• Water use
• Biodiversity
• Landscape and visual impact
• Traffic and transport
• Waste and materials

These topics are typically addressed through an Environmental Impact Assessment (EIA).

7.2 Energy and Carbon Considerations

Because the project includes an Energy Centre, assessments must consider:

• Fuel use
• Emissions
• Energy efficiency
• Potential future fuel alternatives

These factors relate to both local and national policy.

7.3 Local Infrastructure and Community Considerations

The development may interact with:

• Local road networks
• Construction logistics
• Public rights of way
• Nearby residential areas
• Existing utilities

These considerations form part of the planning process.

8. Summary

The M40 SDC proposal is a large‑scale data centre development that includes:

• A 300MW hyperscale data centre campus
• A 270–350MW on‑site Energy Centre
• Supporting infrastructure such as cooling systems, substations, and internal roads

The project is being promoted through a request for a Section 35 Direction, which would allow it to be considered as a Nationally Significant Infrastructure Project.

This article provides a neutral overview of the proposal to support public understanding of its scale, components, and context.