Correction factors relating to the average climatic situation
Ambient temperature correction is based on the difference between the annual average temperature in a Member State and standard ISO conditions (15 oC). The correction will be as follows:
0,1 %-point efficiency loss for every degree above 15 oC;
0,1 %-point efficiency gain for every degree under 15 oC.
Example:
When the average annual temperature in a Member State is 10 oC, the reference value of a cogeneration unit in that Member State has to be increased with 0,5 %-points.
Method for establishing climate zones
The borders of each climate zone will be constituted by isotherms (in full degrees Celsius) of the annual average ambient temperature which differ at least 4 oC.The temperature difference between the average annual ambient temperatures applied in adjacent climate zones will be at least 4 oC.
Example:
In a Member State the average annual ambient temperature in place A is 12 oC and in place B it is 6 oC. The difference is more than 5 oC. The Member State has now the option to introduce two climate zones separated by the isotherm of 9 oC, thus constituting one climate zone between the isotherms of 9 oC and 13 oC with an average annual ambient temperature of 11 oC and another climate zone between the isotherms of 5 oC and 9 oC with an average annual ambient temperature of 7 oC.