Photo taken on May 5 shows that a batch of energy-saving rectifier transformers are tested before delivering to Japan and Bolivia at a local transformer manufacturing company in Luoyang city, Central China's Henan province. In recent years, the company has been developing green and low-carbon technologies,with the performance of its energy-saving transformers leading the industry. Its transformer exports increased by 50 percent year-on-year in the first four months of this year. (Text: Henan Daily Photo: Pan Bingyu)