MELBOURNE (Reuters) - Oil and gas major Royal Dutch Shell said on Friday it plans to build its first utility-scale solar farm in Australia, part of a global push into the power business and cleaner energy. The 120 megawatt (MW) solar farm at Wandoan in the state of Queensland is expected to be completed in early 2021. Shell will be the anchor customer for power from the project, partly for its nearby QGC coal-seam gas operation that feeds its QCLNG plant on Curtis Island. "We believe solar..