Crews are installing the state's largest solar array at Volkswagen. (Photo: Volkswagen Chattanooga)

Construction on Volkswagen's $30 million solar park—which will be the largest single array field in the state— is underway and expected to be complete in the fourth quarter of 2012.

The installation will have 33,600 solar panels and will create about 13.1 gigawatt hours of electricity annually, VW leaders said via email Tuesday. 

The solar panels will generate 12.5 percent of the energy for the plant. 

The solar park is one of several environmentally friendly, energy-efficient efforts from the company. 

In June, Volkswagen made a list of 2012's best global green brands. 

Volkswagen officials announced in December that they reached an important milestone as the first U.S. auto manufacturer to obtain LEED Platinum Certification—the nation's top green building standard. 

And leaders announced this month that the local company met requirements—following an independent audit—to receive the International Organization for Standardization (ISO) certifications, which recognize an organization's compliance with international energy and environmental standards. 

VW's solar array will take up about 65 acres, and leaders said it is an important aspect of the company's LEED certification. (Photo: Volkswagen Chattanooga)