Summary
- Stop Climate Chaos Scotland and more than a dozen groups want formal public consultation before further hyperscale approvals.
- Scotland now requires an Environmental Impact Assessment for new data centre developments exceeding 50MW of total proposed power capacity.
- A separate notification rule gives Scottish Ministers early visibility of large applications while national planning guidance is developed.
Scottish environmental and rural groups are pressing ministers to hold a formal public consultation on hyperscale data centres before further large projects are approved, extending a policy debate that has already produced new environmental assessment and notification rules.
Stop Climate Chaos Scotland and more than a dozen other organisations have written to Public Finance Minister Hannah Mary Goodlad calling for a national conversation on the scale, location and conditions of future development. The coalition includes Action to Protect Rural Scotland, the Scottish Wildlife Trust and Friends of the Earth Scotland.
The request follows a Holyrood vote in September in which MSPs rejected a blanket moratorium but backed amendments calling for national guidance and for planning or consenting decisions to wait while that work is developed. The new letter therefore seeks a formal consultation around a process that Parliament has already asked ministers to strengthen.
Policy has also moved since that vote. A Scottish Government direction requires an Environmental Impact Assessment for new data centre developments whose total proposed electrical power capacity exceeds 50MW, with the requirement in force from 17 September.
The 50MW rule changes assessment, not consent
The direction defines power capacity as the total proposed electrical power available to the data centre. That definition is useful because project announcements often move between IT load, connection capacity and whole-site power, even though those measures describe different parts of the facility.
An EIA does not decide whether a project should receive permission. It requires likely significant environmental effects to be assessed systematically as part of the planning process, giving decision makers and consultees a more complete evidence base on issues such as energy, water, emissions, land and other local impacts.
Projects below the 50MW threshold are not automatically exempt from environmental assessment. The Scottish Government says they remain subject to the existing EIA regulations and can still require assessment on a case-by-case basis.
A separate direction introduced in August also requires planning authorities to notify Scottish Ministers within seven days when applications for data centres above 50MW are validated. That gives central government earlier visibility of the large project pipeline even when the local planning authority remains responsible for the application.
Together, the two directions create a more formal national layer around projects whose electricity requirement can rival major industrial loads. The campaign groups want public consultation to shape what comes next, including the national planning guidance requested by Parliament.
Power demand sits at the centre of the dispute
Scotland has substantial renewable generation, but national electricity production does not translate automatically into connection capacity at a proposed data centre site. Large loads need transmission and distribution infrastructure capable of moving the required power to the chosen location while maintaining network security.
That creates a planning question even in regions with strong wind generation. A data centre can draw a relatively continuous load, whereas wind output varies, so the system has to balance generation and demand across time as well as aggregate annual energy.
Developers can use long-term renewable contracts, batteries and other arrangements to change their commercial or operational exposure, but those measures do not remove the physical requirement for a connection capable of serving the site. Onsite backup generation also brings separate air-quality, fuel and noise considerations.
Campaigners are additionally concerned about water, land use, climate effects and the cumulative impact of several large projects. Those questions are difficult to answer from a single scheme in isolation if a number of campuses are competing for the same network reinforcements, water resources or local development land.
Industry and investment groups have taken the opposite view on a moratorium, warning that uncertainty could push projects elsewhere. The current policy direction stops short of a ban and instead raises the information and oversight requirements applied to large proposals.
The latest consultation demand therefore arrives after Scotland has already altered the planning treatment of data centres. The outstanding issue is how far government should go in setting national criteria before individual councils make decisions and how public views should feed into those criteria.
A useful national framework would need to distinguish planned power from connected power, assess cumulative infrastructure requirements and set expectations for evidence on cooling, water, backup generation and heat reuse without assuming that every project uses the same engineering model.
Scotland’s debate has consequently moved from whether hyperscale data centres warrant special scrutiny to what that scrutiny should contain. The 50MW EIA threshold and notification rules provide a procedural starting point; the campaigners are now asking ministers to expose the wider policy framework to public consultation before the next major approvals are decided.
