On Monday, the Hong Kong–based CLP power group announced it will invest $270 million in what will be the world's largest solar plant. Once the plant is completed in 2013 in Victoria, Australia, it will generate 154MW of electricity, enough to power 45,000 homes. Yet they're not using solar thermal. Instead, they're using a similar method called concentrated photovoltaic. The technology is much like solar thermal in that it uses a huge field of mirrors to concentrate light, but instead of heating a liquid to generate steam, this concentrated light illuminates a high-efficiency PV panel that then converts the energy into electricity.