Although the world's largest geothermal power installation is The Geysers in California with a rated capacity of 750 MW, Brazil has one of the largest renewable energy programs in the world, involving production of ethanol fuel from sugar cane that provides automotive fuel. Ethanol fuel is also widely available in the United States. While most renewable energy projects are large-scale, renewable technologies are also adapted to smaller off-grid applications. Kenya, for example, is a world leader in household solar ownership, installing approximately 30,000 small (20100 watt) solar power systems per year. Some renewable energy technologies are scrutinized for intermittent deliveries or unsightly systems however, the renewable energy market and popularity continue to grow because of climate change concerns and high oil prices. Consequently, the renewable energy industry is the recipient of increasing government support, new legislation, incentives and commercialization, making this curriculum unit a real-time resource for mathematics-based demonstrations.