A method of producing methanol includes supplying biomass feedstock to a hydrotreating unit to produce a biofuel and a biogenic off gas. The biogenic off gas is delivered to a methane reforming unit to generate a syngas having higher hydrogen content than the biogenic off gas. The method also includes delivering a first portion of the syngas to a hydrogen purification unit to produce a hydrogen stream. The hydrogen stream is delivered to the hydrotreating unit. A second portion of the syngas is delivered to a methanol generation unit. Methanol is generated from the second portion of the syngas by the methanol generation unit.

A plant, such as a hydrocarbon plant, is provided, which consists of a syngas stage for syngas generation and a synthesis stage where said syngas is synthesized to produce syngas derived product, such as hydrocarbon product. The plant makes effective use of various streams; in particular CO.sub.2 and H.sub.2. A method for producing a product stream, such as a hydrocarbon product stream is also provided.