As people and governments continue to increase their focus on renewable energy both in Japan and around the world, the Japan Renewable Energy Week 2011 was held for three days from March 2 to 4. Japan Renewable Energy Week comprises the 7th International Hydrogen and Fuel Cell Expo (FC Expo), the 4th International Photovoltaic Power Generation Expo (PV Expo), the 2nd International Rechargeable Battery Expo (Battery Japan), the 2nd International Photovoltaic Power Generation System Expo (PV System Expo), the 2nd Processing Technology Expo, the 1st Eco House and Eco Building Expo, and the 1st International Smart Grid Expo. The events were organized by Reed Exhibitions Japan and held at Tokyo Big Sight. Each one of these expos is the largest of its kind in Japan and globally, bringing together literally the world’s largest collection of state-of-the-art products and services in the fields of renewable energy and eco buildings.