NIBE,
General Electric (France),
STO,
ACCIONA,
PG,
ZAG,
UoA,
PSE,
ASM Centre for Research and Analysis Market (Poland),
ECN,
TECNALIA,
CSTB,
TNO,
D'Appolonia (Italy),
KOLLEKTORFABRIK GMBH & CO KG,
INTERPANE,
ALUSTA,
EPPAG,
BSW,
AES,
University of Stuttgart,
FHG,
HIDRIA,
ACCIONA INSTALACIONES SA,
KOLLEKTORFABRIK GMBH & CO KG,
KOW,
PBerch