ENDESA DISTRIBUCION,
KEMA NEDERLAND BV,
CURRENT TECHNOLOGIES INTERNATIONAL GMBH,
CENELEC,
ELSTER GMBH,
E-DISTRIBUZIONE SPA,
ELSTER,
ENDESA RED,
LANDIS+GYR AG,
Itron (France),
DLMS USER ASSOCIATION,
RSE SPA,
STMicroelectronics (Switzerland),
ADD,
AMPRION GMBH,
IBERDROLA DISTRIBUCION ELECTRICA, S.A.,
Netbeheer Nederland,
KIT,
ZIV,
General Electric (France)