# Commission Implementing Decision (EU) 2017/1442 of 31 July 2017 establishing best available techniques (BAT) conclusions, under Directive 2010/75/EU of the European Parliament and of the Council, for large combustion plants (notified under document C(2017) 5225) (Text with EEA relevance), Division BAT 40: In order to increase the energy efficiency of natural gas combustion, BAT is to use an appropriate combination of the techniques given in BAT 12 and below.

Extent: E+W+S+N.I.

Technique
Description
Applicability
a.
Combined cycle
See description in Section 8.2
Generally applicable to new gas turbines and engines except when operated < 1 500 h/yr.
Applicable to existing gas turbines and engines within the constraints associated with the steam cycle design and the space availability.
Not applicable to existing gas turbines and engines operated < 1 500 h/yr.
Not applicable to mechanical drive gas turbines operated in discontinuous mode with extended load variations and frequent start-ups and shutdowns.
Not applicable to boilers
Table 23
BAT-associated energy efficiency levels (BAT-AEELs) for the combustion of natural gas
These BAT-AEELs do not apply to units operated < 1 500 h/yr.
In the case of CHP units, only one of the two BAT-AEELs ‘Net electrical efficiency’ or ‘Net total fuel utilisation’ applies, depending on the CHP unit design (i.e. either more oriented towards electricity generation or heat generation).
Net total fuel utilisation BAT-AEELs may not be achievable if the potential heat demand is too low.
These BAT-AEELs do not apply to plants generating only electricity.
These BAT-AEELs apply to units used for mechanical drive applications.
These levels may be difficult to achieve in the case of engines tuned in order to reach NOX levels lower than 190 mg/Nm3.
Type of combustion unit
BAT-AEELs
Net electrical efficiency (%)
Net total fuel utilisation (%)
Net mechanical energy efficiency (%)
New unit
Existing unit
New unit
Existing unit
Gas engine
39,5–44
35–44
56–85
No BAT-AEEL.
Gas-fired boiler
39–42,5
38–40
78–95
No BAT-AEEL.
Open cycle gas turbine, ≥ 50 MWth
36–41,5
33–41,5
No BAT-AEEL
36,5–41
33,5–41
Combined cycle gas turbine (CCGT)
CCGT, 50–600 MWth
53–58,5
46–54
No BAT-AEEL
No BAT-AEEL
CCGT, ≥ 600 MWth
57–60,5
50–60
No BAT-AEEL
No BAT-AEEL
CHP CCGT, 50–600 MWth
53–58,5
46–54
65–95
No BAT-AEEL
CHP CCGT, ≥ 600 MWth
57–60,5
50–60
65–95
No BAT-AEEL

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Source: https://www.legislation.gov.uk/eudn/2017/1442/annex/division/4/division/4.1/division/4.1.1/division/1 (the official version)
Page: https://openlegislation.uk/eu-decision-2017-1442/annex/division-4/division-4.1/division-4.1.1/division-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.