Region  Major Utility                  Cost 
  1   {electricity, coal, wood, gas} [190, 230]
  2   {electricity, oil, coal}       [21.5, 25.5]
  3   {coal}                         [40, 53]
  4   {other}                        15.5
  5   {gas, oil, other}              [25, 30]
  6   {electricity}                  46.0
  7   {electricity, coal}            [37, 43]