Medium combustion plant and specified generators: environmental permits
If you operate a medium combustion plant (MCP) or a generator, find out if you need to meet MCP and specified generator regulations.
Applies to England and Wales
The environmental permitting regulations (EPR) include requirements for:
- medium combustion plants
- specified generators
You will need to apply for a MCP or specified generator environmental permit (or both) if the regulations apply to your MCP or generator.
Regulators
This guidance applies to operators in England and Wales. The regulators are:
- Environment Agency for England
- Natural Resources Wales for Wales
Air quality
MCP and specified generator environmental permits protect air only.
The permits can control emissions of these pollutants to air:
- sulphur dioxide
- nitrogen oxides
- dust
Improving air quality will reduce the potential risks to human health and the environment.
The permits are stand-alone unless the MCP or generator is part of:
- an Industrial Emissions Directive (IED) installation permit (see the section of this guide on ‘IED chapter 2 permits affected by the regulations’)
- a part B environmental permit
Where you have an existing environmental permit under the IED or a Part B local authority permit you may need to vary your permit to include MCP or specified generator requirements.
The regulations set the emission controls your MCP or generator must meet. The emission limits are conditions of the permit.
Best available techniques (BAT) do not apply to the stand-alone environmental permits.
Medium combustion plants
The MCP regulations apply to MCP with a capacity more than or equal to 1 megawatt thermal (MWth) and less than 50MWth burning any fuel.
MCPs are classed as new or existing.
Read the guidance Medium combustion plant: when you need a permit to check:
- if your static or mobile MCP requires a MCP environmental permit – it may be excluded from meeting the regulations
- the deadline for getting the permit
If your MCP:
- does not generate electricity then only the MCP regulations apply
- does generate electricity then both the MCP and specified generator regulations may apply
Generators
A generator is a combustion plant that generates electricity.
The specified generator regulations apply to generators with a capacity up to 50MWth burning any fuel.
Generators are classed as Tranche A or Tranche B.
Read the guidance Specified generator: when you need a permit to check if your static or mobile generator, or a number of generators on your site, require a specified generator environmental permit – some specified generators are excluded from meeting the regulations.
When both MCP and specified generator regulations apply to your generator
The MCP and specified generator regulations have different sets of criteria to assess against.
If your MCP generates electricity both sets of controls may apply.
Assess if your MCP needs to meet the:
- MCP regulations
- specified generator regulations
If both:
- the regulations requiring the stricter controls will apply
- you must get your permit by the earliest date set in the regulations
IED chapter 2 permits affected by the regulations
The specified generator regulations do not apply on a chapter 2 IED installation site. However, these regulations will inform site specific BAT.
MCP regulations do apply to a MCP on a chapter 2 IED installation. You must meet MCP requirements where it’s a:
- primary activity – where the total rated thermal input is more than 50MWth on an installation, for example gas engines generating electricity
- directly associated activity – combustion to another chapter 2 activity, for example combustion on a chemical manufacturing site
As a minimum, the MCP must meet the appropriate Medium Combustion Plant Directive (MCPD) emission limit value (ELV) by the required date. If the existing ELVs (required by BAT) are stricter than required by MCPD, BAT will continue to apply. A site specific BAT assessment may identify the need for stricter ELVs, for example to protect air quality.
If you can prove that site specific BAT has changed, for example you’ve changed a base load plant to a peaking plant, you can reassess ELVs. However, MCPD requirements are the minimum standard required.
You will need to vary your permit if your chapter 2 IED installation:
- adds a new MCP – you will need to do this now
- includes an existing MCP – the regulator will contact you before the permitting deadline
In England, use the Environment Agency’s form C2.5:
- to add a new MCP to your existing IED installation
- for a new activity or substantially refurbished activity for MCPs with a total aggregated thermal input of 20MWth or more
In Wales, check the Natural Resources Wales guide on how to apply to vary (change) a permit for installations.
The regulator will include MCPD requirements into your permit, such as ELVs and monitoring.
Check the guidance Medium combustion plant: when you need a permit to find out if the regulations apply to your MCP and the deadlines for getting a permit.
You cannot apply for a stand-alone permit for an MCP which is a directly associated activity on a chapter 2 IED installation.
Part B installations affected by the regulations
MCP and specified generator regulations apply to some Part B activities, in particular for sections:
- 1.1 – combustion activities
- 5.1 – incineration of waste wood
The Environment Agency (for England) and Natural Resources Wales (for Wales) will regulate the MCPD requirements. These were previously regulated by local authorities.
See guidance on the requirements for MCPs that are a Part B activity.
Updates to this page
Last updated 22 July 2024 + show all updates
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In the ‘IED chapter 2 permits affected by the regulations’ section, clarified how to apply to vary a permit in Wales. Also clarified that you cannot apply for a stand-alone permit for an MCP which is a directly associated activity on a chapter 2 IED installation.
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Read the guidance Medium combustion plant: when you need a permit to check the deadline for getting the permit. We have clarified when you need to vary your permit under a chapter 2 IED installation.
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Under the heading 'Generators', removed the sentence about reading the guidance to check the deadline for getting permit.
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We've added a link to form C2.5 to add a medium combustion plant (MCP) or specified generator (SG) to an existing bespoke permit or to change (vary) a standalone MCP or SG permit.
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First published.