16. CONCENTRATIONS

During 2014, 52% of revenues were derived from three customers at 30%, 16% and 6%. During 2013, 50% of revenues were derived from two customers at 33% and 17%. During 2012, 51% of revenues were derived from two customers at 47% and 4%.

The Company’s major product lines in 2014 and 2013 were power and electro-mechanical products and natural gas infrastructure and high-tech solutions. During 2012, the company’s major product lines were power and electro-mechanical products.

At December 31, 2014, of the gross trade accounts receivable totaling approximately $12.1 million, 38% was due from three customers: 16%, 13% and 9%. At December 31, 2013, of the gross trade accounts receivable totaling approximately $9.3 million, 25% was due from one customer. At December 31, 2012, 45% of the gross trade accounts receivable totaling approximately $5.1 million, was due from two customers: 37% and 8%.

During 2014, the Company had one supplier concentration of 11% related to inventory product received.

With the United Kingdom operations of Orbital Gas Systems, the Company also has foreign revenue and trade accounts receivable concentrations in the United Kingdom of 34% and 46%, respectively for the year ended December 31, 2014.