Energy wastage, especially in public buildings, is one of the widely acknowledged issues that have to be addressed towards protecting the environment. Furthermore, affecting the occupants’ behaviour has been identified in the literature as an under-investigated means of conserving energy. In this research paper we report on the results from an investigation we conducted in three different workplaces, situated in different EU countries. In a survey of N=119 employees, we explore Employee Motivations to Participate in Gamification at work (EMPG) and identify the needs for (i)Self- Actualisation, (ii)Self-Regulation, (iii)Rewards & Recognition and (iv)Affiliation as most prominent. Additionally we examine the employees’ profiles, specific needs and preferences in game elements, towards participating in gamification aimed at conserving energy at the workplace. Correlations of the four types of EMPG with basic game elements and energy-saving actions at work are consequently explored and discussed. Ultimately, taking into consideration employees’ motivations and preferences, we derive and propose design guidelines for gamified applications providing personalised feedback towards saving energy at work.