Internationalization is an essential component of corporate strategy. The present study, which focuses on the renewable energy sector, is an empirical investigation into the prognostic strength of the Gestalt Approach of International Business Strategies (GAINS approach) for the identification of potentially successful strategies for internationalization, focusing on the mode of market entry.The results show that (1) the GAINS approach has a high prognostic potential for successful internationalization strategies, since (a) FIT configurations represent Gestalts, i.e. they show significantly higher success of internationalization than other configurations, (b) consistent configurations show significantly higher success than congruent configurations and (c) MISFIT configurations prove to be the least successful configuration. (2) Although FIT configurations promise the highest success of internationalization, the results indicate that many companies do not enter into fit configurations. Yet, it was proven, that (3) CONSISTENT configurations are preferred compared to CONGRUENT configurations and (4) MISFIT configurations are significantly being avoided.