The impact of plummeting silicon PV prices hit hard in the concentrated solar thermal space, where casualties included Millennium Solar and Stirling Energy Systems in the US, both of which entered into bankruptcy. The Power Purchase Agreement with PG&E for energy from the giant 280MW Abengoa Mojave Solar project, which is being supported by US$1.2 billion in loan guarantees from the US DoE, received approval to go ahead in November 2011, despite questions about the high costs being paid for the electricity. Mojave will use parabolic trough technology. Meanwhile, in Abu Dhabi, the 100MW Masdar Shams 1 parabolic trough solar thermal plant, being developed by Abengoa and Total, is reported to be gearing up for operation in 2012. However, a number of earlier stage projects are switching from the use of solar thermal technology to concentrated photovoltaic (CPV) technology. These include the Solar Trust of America Blythe project and the Calico and Imperial Valley projects, which were originally developed by Tessera Solar (a company owned by Ireland’s NTR, which held a majority stake in Stirling Energy Systems) and had planned to use Stirling technology.