The invention relates to an energy producing and utilising system in plant cultivation in which for producing energy a combustion engine and a dynamo driven by the combustion engine are used, whilst the heat extracted from the exhaust gases and/or the cooling water is utilised for heating purposes, whereby at least part of the electric energy produced is used for illuminating one or more insulated buildings in which plants are cultivated with the aid of artificial light, whilst the buildings are maintained at a given, desired temperature with the aid of at least one cooling system and the heat conducted away from the buildings with the aid of the cooling system is also utilised for heating purposes.
