Canadian Solar (CSIQ) has signed two long term supply contracts with GCL Silicon Tech strengthening its polysilicon and wafer supply chain.  Under terms of the deal, GCL Silicon will supply CSIQ with 500 metric tons of polysilicon this year and next and nearly 2 GW of wafers from 2010 to 2015

"These two contracts help us to further secure our supply chain with strong suppliers at favorable long-term contract prices," Canadian Solar Chief Executive Shawn Qu said in a statement on Wednesday.