Since its first proposition in 1984, the Kano model has been used extensively in a variety of contexts within industries and academic research demonstrating its wide applicability. The Kano model allows for describing the relationship between an objective aspect and a subjective aspect. Yet is this relevant for environmental quality as well? In this study, we explore the cases where the Kano model is used for assessing environmental quality and its perception by consumers and identify the potential influencing factors for its application with this respect. We find that the Kano model can serve as an effective tool for converging towards environmental quality and sustainability by indicating the direction from a social and behavioral choice perspective. We propose an integration of the Kano model with Bandura's triangle (a concept of the social cognitive theory) to create an instrument for driving change of customer attitude and behavior via changing the perception of environmental quality.

-When the renewable energy is used, the challenge is match the supply of intermittent energy with the demand for energy therefore the energy storage solutions should be used. This paper is dedicated to hydrogen accumulation from wind sources. The case study investigates the conceptual system that uses intermitted renewable energy resources to produce hydrogen (power-to-gas concept) and fuel (power-to-liquid concept). For this specific case study hydrogen is produced from surplus electricity generated by wind power plant trough electrolysis process and fuel is obtained by upgrading biogas to biomethane using hydrogen. System dynamic model is created for this conceptual system. The developed system dynamics model has been used to simulate 2 different scenarios. The results show that in both scenarios the point at which the all electricity needs of Latvia are covered is obtained. Moreover, the methodology of system dynamics used in this paper is white-box model that allows to apply the developed model to other case studies and/or to modify model based on the newest data. The developed model can be used for both scientific research and policy makers to better understand the dynamic relation within the system and the response of system to changes in both internal and external factors. Keywords

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