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Directive 2004/8/EC of the European Parliament and of the Council (repealed)Dangos y teitl llawn
Directive 2004/8/EC of the European Parliament and of the Council of 11 February 2004 on the promotion of cogeneration based on a useful heat demand in the internal energy market and amending Directive 92/42/EEC (repealed)
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Changes over time for: ANNEX III
Version Superseded: 05/06/2014
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EU Directives are published on this site to aid cross referencing from UK legislation. Since IP completion day (31 December 2020 11.00 p.m.) no amendments have been applied to this version.
ANNEX IIIU.K.Methodology for determining the efficiency of the cogeneration process
Values used for calculation of efficiency of cogeneration and primary energy savings shall be determined on the basis of the expected or actual operation of the unit under normal conditions of use.
(a)High-efficiency cogenerationU.K.
For the purpose of this Directive high-efficiency cogeneration shall fulfil the following criteria:
cogeneration production from cogeneration units shall provide primary energy savings calculated according to point (b) of at least 10 % compared with the references for separate production of heat and electricity,
production from small scale and micro cogeneration units providing primary energy savings may qualify as high-efficiency cogeneration.
(b)Calculation of primary energy savingsU.K.
The amount of primary energy savings provided by cogeneration production defined in accordance with Annex II shall be calculated on the basis of the following formula: 
Where:
PES
is primary energy savings.
CHP Hη
is the heat efficiency of the cogeneration production defined as annual useful heat output divided by the fuel input used to produce the sum of useful heat output and electricity from cogeneration.
Ref Hη
is the efficiency reference value for separate heat production.
CHP Eη
is the electrical efficiency of the cogeneration production defined as annual electricity from cogeneration divided by the fuel input used to produce the sum of useful heat output and electricity from cogeneration. Where a cogeneration unit generates mechanical energy, the annual electricity from cogeneration may be increased by an additional element representing the amount of electricity which is equivalent to that of mechanical energy. This additional element will not create a right to issue guarantees of origin in accordance with Article 5.
Ref Eη
is the efficiency reference value for separate electricity production.
(c)Calculations of energy savings using alternative calculation according to Article 12(2)U.K.
If primary energy savings for a process are calculated in accordance with Article 12(2) the primary energy savings shall be calculated using the formula in paragraph (b) of this Annex replacing:
‘CHP Hη’ with ‘Hη’ and
‘CHP Eη’ with ‘Eη’,
where:
Hη
shall mean the heat efficiency of the process, defined as the annual heat output divided by the fuel input used to produce the sum of heat output and electricity output.
Eη
shall mean the electricity efficiency of the process, defined as the annual electricity output divided by the fuel input used to produce the sum of heat output and electricity output. Where a cogeneration unit generates mechanical energy, the annual electricity from cogeneration may be increased by an additional element representing the amount of electricity which is equivalent to that of mechanical energy. This additional element will not create a right to issue guarantees of origin in accordance with Article 5.
(d)Member States may use other reporting periods than one year for the purpose of the calculations according to paragraphs (b) and (c) of this Annex.U.K.
(e)For micro-cogeneration units the calculation of primary energy savings may be based on certified data.U.K.
(f)Efficiency reference values for separate production of heat and electricityU.K.
The principles for defining the efficiency reference values for separate production of heat and electricity referred to in Article 4(1) and in the formula set out in paragraph (b) of this Annex shall establish the operating efficiency of the separate heat and electricity production that cogeneration is intended to substitute.
The efficiency reference values shall be calculated according to the following principles:
1.
For cogeneration units as defined in Article 3, the comparison with separate electricity production shall be based on the principle that the same fuel categories are compared.
2.
Each cogeneration unit shall be compared with the best available and economically justifiable technology for separate production of heat and electricity on the market in the year of construction of the cogeneration unit.
3.
The efficiency reference values for cogeneration units older than 10 years of age shall be fixed on the reference values of units of 10 years of age.
4.
The efficiency reference values for separate electricity production and heat production shall reflect the climatic differences between Member States.
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