NOVELTY - The method comprises continuously aggregating an algae feed (13) comprising a liquid and algae (14) dispersed in the liquid by applying a nanosecond pulsed electric field to the algae feed, continuously separating an aggregated algae stream from the algae feed, and processing the aggregated algae stream to produce an algae biofuel. The nanosecond pulsed electric field is generated by electric pulses having a pulse duration of 1-1000 nanoseconds, neutralizes repulsive charges of the algae, and produces a plasma discharge or an arc discharge.    USE - The method is useful for aggregating algae in an aqueous solution for dewatering and harvesting of algae, which are useful for the production of the biofuels including vegetable oil, biodiesel, bioethanol, biogasoline, biomethanol, biobutanol and other biofuels.    ADVANTAGE - The method is capable of simply and economically aggregating and harvesting algae in an aqueous solution without addition of an aggregation agent thus energy efficiently producing the biofuels.    DETAILED DESCRIPTION - The method comprises continuously aggregating an algae feed (13) comprising a liquid and algae (14) dispersed in the liquid by applying a nanosecond pulsed electric field to the algae feed, continuously separating an aggregated algae stream from the algae feed, and processing the aggregated algae stream to produce an algae biofuel. The nanosecond pulsed electric field is generated by electric pulses having a pulse duration of 1-1000 nanoseconds, neutralizes repulsive charges of the algae, and produces a plasma discharge or an arc discharge. The algae lose less than 10 wt.% of a lipid content of the algae as a result of the aggregating step. A peak electric field of the pulses produced in the algae feed is 1-1000 kV/cm. A peak power of the pulses is 1 MW. A peak voltage of the pulses is 1-500 kV. The aggregating step comprises adding aggregating agents. An INDEPENDENT CLAIM is included for a system for aggregating algae.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a system for high-voltage pulse assisted aggregation of algae.    Algae reservoir (12)    Algae feed (13)    Algae (14)    Aggregation reactor (16)    Nanosecond pulsed electric field system. (18)