Volunteer Service Abroad (VSA) have a couple of opportunities going in the Pacific:
Energy Auditor (Tonga) – Working alongside the Pacific Centre for Renewable Energy & Energy Efficiency (PCREEE) to build the knowledge and capacity of local staff in Tonga in the areas of energy efficiency. PCREEE is part of a wider partnership which aims to establish a network of regional sustainable energy centres for small island developing states in Africa, Caribbean, Pacific and Indian Ocean.
Renewable Energy Adviser (Fiji) – Supporting the Pacific Community (SPC) in identifying renewable energy sources and build awareness of bio-gas generation. SPC provide technical and policy advice to Pacific Island countries about energy, fisheries, science, public health and conservation of plant genetic resources for food security.