GENEVA, March 15 -- GUANGXI POWER GRID LIMITED LIABILITY COMPANY (No.6 Minzhu Road, Xingning DistrictNanning, Guangxi 530023), 广西电网有限责任公司 (中国广西壮族自治区南宁市兴宁区民主路６号), SOUTHERN POWER GRID SCIENTIFIC RESEARCH INSTITUTE CO., LTD (3rd, 4th, 5th Floor, Building J1, No. 11, Kexiang Road, Science City, Luogang District, And 3rd Floor, Building J3Guangzhou, Guangdong 510663), 南方电网科学研究院有限责任公司 (中国广东省广...