The relevance of energy efficiency policy measures for renewable-rich countries could be different from those countries that have a limited share of renewables in their electricity generation mix, and are therefore likely to focus on low-carbon energy generation policies. This paper presents a comparative analysis of the energy efficiency initiatives of the three highest renewable-rich OECD countries, namely: Iceland, Norway and New Zealand. The paper then focuses on a comprehensive review of New Zealand's energy efficiency policies since a formal "Energy Efficiency and Conservation Act" came into force. This paper then highlights the future challenges for New Zealand and offers some policy recommendations, which may also be applicable for other renewable-rich countries.