This paper proposes a support mechanism for energy storage devices for island power systems where intermittent renewable generation is rapidly growing. We base our proposal on the maturity level of storage devices (Chen et al., 2009 [7]) and on the linear model for the development of innovations [14]. We focus on storage technologies that can be technically developed in island power systems and that achieve the technical needs of these systems. We conclude and recommend the adoption of a feed-in tariff with a price varying with the time of day to push for the deployment of power storage avoiding the curtailment of massive intermittent renewable generation.