NOVELTY - A system for generating photocurrent, comprises: (a) isolated biological photosystem II (PSII) complexes; (b) an anode selected from graphite anode, glassy carbon anode, and fluorine-doped tin oxide (FTO) anode, where the PSII complexes are deposited onto the anode; (c) a source of red or white light, where red or white light illumination of the PSII complexes deposited on the anode generates a photoresponse comprising a photocurrent; (d) a working solution; and (e) a cathode; where the photoresponse remains stable for at least about 4 hours under intermittent illumination.    USE - The systems and methods are useful for generating photocurrent, and for generating hydrogen (all claimed).    ADVANTAGE - The system is cost effective and highly reliable.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are:    (1) a system for generating hydrogen, comprising: (a) isolated biological PSII complexes; (b) an anode selected from a graphite anode, a glassy carbon anode, and an FTO anode, where the PSII complexes are deposited onto the anode; (c) a source of red or white light, where red or white light illumination of the PSII complexes deposited on the anode generates a photoresponse comprising a photocurrent; (d) a working solution; and (e) a platinum rotating ring disc electrode (RRDE) cathode; where the photocurrent from PSII is used to generate hydrogen production on the cathode;    (2) a method for generating photocurrent, comprising: (a) isolating biological PSII complexes; (b) providing an anode selected from a graphite anode, a glassy carbon anode, and an FTO anode, where the PSII complexes are deposited onto the anode; (c) providing a working solution; (d) providing a cathode; and (e) illuminating with red or white light the PSII complexes deposited on the anode, where red or white light illumination of PSII complexes generates a photoresponse comprising a photocurrent; where the photoresponse remains stable for at least about 4 hours under intermittent illumination; and    (3) a method for generating hydrogen, comprising: (a) isolating biological PSII complexes; (b) providing an anode selected from a graphite anode, a glassy carbon anode, and an FTO anode, where the PSII complexes are deposited onto the anode; (c) providing a working solution; (d) providing a platinum RRDE cathode; and (e) illuminating the PS II complexes deposited on the anode with red or white light, where illumination of the PSII complexes generates a photoresponse comprising a photocurrent and where the photocurrent from PSII is used to generate hydrogen production on the cathode.