By Emma Pinedo SAGUNTO, Spain (Reuters) -German carmaker Volkswagen AG and partners will invest 10 billion euros ($10.6 billion) to make electric vehicles and batteries in Spain, its chief executive said on Thursday, 3 billion euros more than it had previously committed. The company also announced a partnership deal with Spain’s largest power utility Iberdrola, which will set up a solar park to partly power the battery plant to be built in the municipality of Sagunto near Valencia. Iberdrola will invest 500 million euros in the electrification plan, its Chief Executive Officer Ignacio Sanchez …