The use of proteins involved in the photosynthetic process enables the development of affordable and efficient devices for energy conversion. However, although proteins such as photosystem I are robust in nature, the use of isolated protein complexes incorporated in semi-artificial electrodes is associated with a considerably short long-term stability. In consequence, the technological application of these kind of biodevices is still limited. Researchers at Ruhr-Universität Bochum (RUB) showed that a careful operation of the photosystem-based bioelectrode under the exclusion of oxygen is the key for achieving high stability.