Plug Power announced that it is expanding its board with the appointment of an SK Group executive who built a career chasing new energy markets. Kyungyeol Song, head of quantum growth for SK Group company, SK E&S Co. Ltd., joins Plug's board two months after the Latham hydrogen fuel cell maker received a $1.5 billion investment from the South Korean chemicals and energy company. Prior to joining SK Group, Song was a director for McKinsey Energy Center, leading its electrical power and chemicals practice in South Korea.