As part of the innovation process, including ecological sector, the characteristics of the interaction of participants in the chain "producer-intermediary-consumer"are considered. The possible influence of companies promoting innovative products, which play the role of an intermediary and are a link between the manufacturer and the consumer, on the perception of the manufacturer's innovative products by the end user has been evaluated. The features of the activities of specialized companies to promote innovative products to the market have been investigated. Based on the use of the theory of expectations by Viktor Vrum, a mathematical model is proposed that describes the effectiveness of interaction between the participants in the innovation process within the "producer-intermediary-consumer"chain, which makes it possible to assess the quality of the activities of specialized companies in promoting innovative products to the market including ecological and energy sector. © Published under licence by IOP Publishing Ltd.