Compared to this, extremely small, but compared to the overall economics, quite significant.
Here is a chart of transmission losses from the source to the end user across US states: http://insideenergy.org/wp-content/uploads/2015/11/State_Los...
Here is a chart of transmission losses from the source to the end user across US states: http://insideenergy.org/wp-content/uploads/2015/11/State_Los...
Beyond delivery loss, don't forget that there are other CAPEX/OPEX considerations.
For example, an underwater cable from an offshore wind-farm might be a more efficient means of energy delivery but it's installation and maintenance cost would be much much higher and require more time to deploy than a wireless solution.
That is inevitably a significant part of any economic benchmarking.