Last month in New York, the world adopted the Sustainable Development Goals (SDGs), defining the global development agenda for the next 15 years. Among the 17 goals is Goal 7's aim to ensure “access to affordable, reliable, sustainable and modern energy for all.” Given that an estimated 1.3 billion people have no access to electricity and that 70% of the world's poor live off-grid in the countryside, this is indeed ambitious. How do we ensure that these remote communities have access to energy?