The US Solar Utility Market has been the preserve of the 2 largest US Solar Module Players Sunpower and First Solar.While other Solar Panel Makers have won small deals,these 2 companies have dominated the US Utility Market so far.Sunpower has been very successful in the commercial,municipal and utility segments winning a huge number of deals even as its residential dominance evaporated.The bigger Chinese solar producers like Trina,Yingli,Suntech had already taken over the residential market in California with their much cheaper prices.Now even the larger utility market is under threat from the low cost companies from Asia.Note upstream producers like LDK and GCL Poly are also targeting the system development market in US through acquisitions and alliances.The 250 MW Sempra Generation solar plant being built in Arizona will source Suntech modules and will be completed by 2013.This is a huge order win by Suntech which is the largest module producer in 2010 and could see other Chinese producers using this as a template to push out Sunpower and First Solar.