1.Each transmission system operator shall use the common set of units defined in this Article for any data exchange and data publication related to Regulation (EC) No 715/2009.
2.For the parameters of pressure, temperature, volume, gross calorific value, energy, and Wobbe-index the transmission system operators shall use:
(a)pressure: bar
(b)temperature: °C (degree Celsius)
(c)volume: m3
(d)gross calorific value (GCV): kWh/m3
(e)energy: kWh (based on GCV)
(f)Wobbe-index: kWh/m3 (based on GCV)
For pressure, the transmission system operators shall indicate whether it refers to absolute pressure (bar (a)) or gauge pressure (bar (g)).
The reference conditions for volume shall be 0 °C and 1,01325 bar(a). For GCV, energy and Wobbe-index the default combustion reference temperature shall be 25 °C.
Whenever transmission system operators communicate data on the volume, GCV, energy and Wobbe-index, they shall specify under which reference conditions these values were calculated.
[F13.If at any time the United Kingdom is connected to only one member State, or connected to a country or territory that is not connected to a member State, the adjacent TSOs at the relevant interconnection points and the parties they communicate with may agree to continue to use other reference conditions for data exchange in connection with Regulation (EC) No 715/2009 on conditions for access to natural gas transmission networks, subject to the approval of the national regulatory authority.]
Textual Amendments