Guidance

Combined heat and power quality assurance (CHPQA) standard

CHPQA methodology, definitions, QI thresholds, and criteria for Good Quality certification

Documents

Detail

The CHPQA Standard

The CHPQA Standard is the formal document setting out the CHPQA methodology, definitions, thresholds, and criteria for ‘Good Quality’ certification. The Standard specifies different Quality Index (QI) formulae for the purposes of determining eligibility for benefits other than those from the Renewables Obligation and Contracts for Difference (for which the relevant certification requirements are specified in CHPQA Guidance Note 44, Issue 6).

The Standard should be read in conjunction with the supporting CHPQA Guidance Notes, which provide detailed information on how this Standard will be interpreted by government departments and agencies, as well as guidance on compliance with this Standard. It is the intention that the Standard should be subject to minimum change; developments in the application of the Standard will, whenever possible, be reflected in changes in the CHPQA Guidance Notes. The Standard does not address issues relating to the use of CHPQA for determining eligibility for fiscal benefits. For these matters, reference should be made to the CHPQA Guidance Notes and, where necessary, the appropriate government department.

The CHPQA Standard Document - Issue 6

The EU updates the energy efficiency requirements that underpin the CHPQA Scheme every 3-4 years, in line with technological developments. The most recent update was published in December 2015 and should apply to new CHP plants’ operational efficiency from 1 January 2016, when they apply for certification in 2017 – see ‘Which CHPQA Standard Quality Index formulae to use’ below. CHP plants that received CHPQA certification prior to 1 January 2016 will have their QI values grandfathered – these are included in the Table 1 of Issue 5 of the CHPQA Standard. For certain types of new CHP plant (mostly those fuelled by biomass) the energy efficiency requirements are now tighter, however, for most CHP plants the requirements stay the same or are lessened. The CHPQA Administrator engaged with stakeholders when feeding the EU updates into the UK CHPQA scheme.

The CHPQA Standard Document - Issue 5

The government consulted from December 2012 to March 2013 on amendments to Guidance Note 44 (GN 44), proposing tightening of the GN 44 requirements to reflect improvements in the efficiency of renewable CHP schemes since GN 44 was first developed. The government’s response, setting out the changes that would be implemented, was published on 12 July 2013. In some cases the revised GN 44 formulae were more stringent than those in CHPQA Standard at that time (Issue 3). The Standard formulae were revised accordingly and implemented via Issue 5 of the Standard, replacing those in Issue 3 with no provision for grandfathering other than a transition arrangement for existing Schemes.

Which CHPQA Standard Quality Index formulae to use

  • The CHPQA Standard Issue 6 QI formulae apply to all Schemes that receive an F3 or an F4 CHPQA certificate on or after 1 January 2017, where they have not received an F3 or an F4 certificate prior to 1 January 2016. Also, all Schemes that receive an F3 CHPQA certificate (based on design data) for the first time between 1 January and 31 December 2016 will be certified on the basis of the Standard Issue 6 QI formulae from 2017 onwards. Detailed grandfathering arrangements and how these will be applied can be found in Issue 6 of the CHPQA Standard.
  • Schemes that received an F3 prior to 1 January 2016 or an F4 CHPQA certificate prior to 1 January 2017 will continue to receive CHPQA certification on the basis of the Standard Issue 5 QI formulae under which they were previously certified.