Honolulu-based Sopogy Inc. said it has entered an agreement with two European companies to develop its biggest project yet, a 50 megawatt solar power plant to be built in Toledo, Spain.

Under the agreement with Spain's Inypsa Informes y Proyectos S.A. and Omniwatt, a German-based solar financier, the plant would be developed in the next two years using Sopogy's solar power system. The design captures solar energy in trough covered in a reflective mirrors, focusing heat on fluid in a pipe that traverses the collector. The heated fluid can be used to power electrical generators.

Sopogy has operated a 1 megawatt installation at Keahole on the Big Island and plans to announce other projects in the next two months. The company declined to release the value of the Spanish contract.