The 2011 Massachusetts Clean Energy Industry Report offers several significant findings related to the growing importance of this sector to the Commonwealth’s overall economy. First, the more than 64,000 clean energy workers in Massachusetts represent 1.5 percent of the total employment in the Commonwealth, a percentage large enough to warrant clean energy to be recognized as a key sector in Massachusetts. In addition, the Massachusetts clean energy sector has breadth and depth across multiple industries and technology areas, and, while research and development are key contributors to the sector’s success here, there is also significant clean energy employment in manufacturing, sales, and the installation of renewable energy.