ELECTRICITY transmission charges are acting as a barrier for investment in green energy projects in Scotland and will hit the transition to a low carbon economy, experts have warned. A new analysis by Scottish and Southern Electricity Networks Transmission, which is responsible for the network for the north of Scotland calls for reform of the current charging regime which means that renewable generators in Scotland pay "significantly" higher costs to connect their electricity to the National Grid than those in other parts of Great Britain. There are concerns that the current charging system discriminates against energy operations in Scotland as the calculations are linked to their distance from big population areas.