Dr.-Ing. Klaus Nickel, Managing Director of ULTRAWAVES, was on 14 December 2017 in the Baltics in the field of biogas. As a guest speaker, he spoke at the biogas seminar on the topics: "Introduction of ultrasonic effects on organic substrates (biomass)" and "Introduction of ultrasonic equipment for biogas production: effects, benefits, case studies, discussions". The interest was high. The seminar was organized by our partner Ekotakas and the Latvian Biogas Association.