This week, some misaligned mirrors at the biggest solar thermal energy plant in the US caused an electrical fire that took out one of the plant's three boiler towers. The fire comes as the plant has been under pressure from the California Public Utilities Commission (CPUC) for failing to meet its productions targets in the two years since the plant opened.
The solar thermal plant, called the Ivanpah Solar Power Facility, is distinct from photovoltaic solar plants in that it doesn't use solar panels. Instead, it relies on an array of 78-square-foot mirrors, known as heliostats, to direct the hot desert sun to one of three 459-foot-high boiler towers. The heat creates steam in the boiler towers, which powers generators to create energy, which is then sold to PG&E and Southern California Edison.