AFP: Australian energy company AGL Energy Limited and New Zealand company Meridian Energy announced on August 12 plans to construct the largest wind farm in the southern hemisphere at Macarthur in Victoria, Australia. On a smaller scale consumers can also buy or build their own turbines. Due to be completed in 2013, the wind farm in Victoria is expected to have the capacity to power more than 220,000 homes saving 1.7 million metric tons of greenhouse gases every year – the equivalent to …