Agencies’ plans for meeting the green government mandates outlined in President Obama’s October executive order aren’t due until June 2, but the Agriculture Department’s chief sustainability officer already has identified one of her top priorities: cutting energy consumption in data centers. Robin Heard, a lifelong conservationist who joined Agriculture in 1976, said she had no idea how much energy is consumed by data centers until she took on her new role as the department’s deputy assistant secretary for administration about a year ago. Speaking Tuesday on the opening day of the GSA Expo in Orlando, Heard said she wants to consolidate the…