Upon its installation, no power was flowing across the rotary joint, so the electricity generated by the P4 solar array wings was only being used on the P4 segment, and not the rest of the station.
Po inštalácii cez tento mechanizmus neprechádzala energia, takže vygenerovaná elektrina zo solárnych panelov bola použitá iba v segmente P4 a nie pre zvyšok stanice.