Reuters: Japan’s Sharp Corp (6753.T: Quote, Profile, Research) said on Thursday it would spend $729 million to build a new solar cell plant in Sakai, western Japan, to better compete with Germany’s Q-Cells (QCEG.DE: Quote, Profile, Research) and other rivals. Sharp said in July it would bring the new plant to production by March 2010 but did not disclose the size of capital investment. Solar companies around the world are expanding production capacity rapidly to meet growing demand for …