Reuters: Spain’s ambitious plans to expand wind power as part of its renewable energy drive will bring environmental and economic benefits but faces technical problems, an industry expert said on Thursday. Spain’s wind parks currently have an installed capacity of some 15,000 megawatts and the government wants to see 20,000 MW in place by 2010 and 30,000 MW by 2030. Spain’s wind power manufacturers say they can expand capacity to 40,000 MW by 2020. But national grid operator REE …