Grid losses depend partly, but not entirely, on the distance electricity travels on the transmission grid. Consumption being equal, the more distant the point where energy is withdrawn (i.e. consumed) from the NTG is from the point where it is injected into the NTG, the larger the losses.    
Furthermore, the distance travelled being equal, the lower the voltage of the line is, the larger the losses are.
Therefore, losses can be reduced by development work to improve the mesh of the grid, i.e. that bring the injection and withdrawal points closer to one another. Losses can also be reduced by upgrading a segment of the grid, for example by replacing a 150-kVi line with a 380-kV on the same stretch.
When the work included in the 2010 Developmenti Plan is completed, the reduction of losses at peak demand could reach 200 MW, which corresponds to a reduction of energy losses in the grid of about 1,200 GWh a year. If this reduction comes from a reduction in fuel-based production, it is estimated that the aforesaid actions will lead to an abatement of CO2 emissions ranging from 500,000 to 600,000 tons a year(1).

(1)Note that the estimate was made with conditions being equal. A change in consumption or in the location of  power plants could lead to different results.