Industrial Emissions Directive

What is IED?

IED places stricter controls on our industrial emissions, encompassing seven directives which have been bought under a single clear legislative instrument.

The Industrial Emissions Directive (IED) came into force on 6th January 2011 and was transposed into UK law as the Pollution Prevention and Control (Scotland) Regulations in 2012, effective from 7th January 2013 and the Environmental Permitting (England and Wales) (Amendment) Regulations in 2013, effective from 27th February 2013.

Over the past two years we have been working with you, our stakeholders, to develop a strategy for our compressors to ensure that they meet the new requirements of the Industrial Emissions Directive (IED).

The most stringent impacts of the IED on National Grid are:

  • a new limit for the emissions of carbon monoxide (CO).
  • a more stringent limit for the emissions of oxides of nitrogen (NOx) for all of our large combustion plant (LCP).

Our large combustion plant had previously been exempt from the LCP Directive limit for NOx by virtue of its age. The IED is now removing this age related exemption and the limit for NOx will now apply to all of our large combustion plant. As a result a number of the larger gas turbines operated by us will need modifying or replacing in order to meet the new and revised limits. Compliance with the new emissions limit is now mandatory. However, we have entered a number of the machines in our fleet which are not compliant into a limited life derogation, allowing the continued operation of those non-compliant machines until either 31st December 2023, or when the machines have accumulated a total of 17,500 operating hours (whichever is soonest).

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