Chloroplast NDH complex forms the supercomplex with two copies of the PSI supercomplex via two linker proteins, Lhca5 and Lhca6. This supercomplex formation is necessary to stabilize the NDH complex in chloroplasts. During its assembly, interaction of the part of the NDH complex (subcomplex B) with a single copy of the PSI supercomplex is prior to the full assembly of the NDH complex. This is necessary to stabilize the Lhca3/Lhca6 heterodimer, which links the NDH complex with a PSI core. The chloroplast NDH complex mediates PSI cyclic electron transport and collaborates with a H+/K+ antiporter KEA3 to fine-tune ∆pH during induction of photosynthesis.