How much electrical power is lost in transmission?

I went through the Energy Information Administration (eia.doe.gov) web site some time ago and found the 7% figure for total losses.  The figures vary widely depending on the route and the loading on the line, of course.

As for Texas, you can only have so much wind on a conventional grid (no storage systems or the like) before it starts to cause problems.  This figure is around 20%, which is about what Denmark gets (IIRC).  The local towns in Texas couldn't soak up as much power as the massive farms produce, so the excess electricity - and the backup generating capacity - has to be shared with the larger load centers toward the Gulf coast.

I think there is some misunderstanding here.

I'm sure that ERCOT could give an exact number on losses in Texas, but in general, losses on a power system tend to run in the range of 3-7%. There are MANY factors that determine where the actual number is in any situation.

The questioner has raised a question that, at one level, is a little dumb. On the other hand, the question is one that many people ask and is based on some of the really stupid statements that appear in the media about electric power systems.

There are two ways to look at the electric power industry. From the perspective of the fundamental laws of physics, power will flow from the source to the load based on simply physical rules. In that sense, the situation that the asker poses as a hypothetical is actually what really happens - power produced in West Texas will be consumed in West Texas.

But there is another way to look at the industry - as a commodity market in which there are buyers and sellers. In that sense, it is entirely possible that purchasers in East Texas could enter in to contracts to purchase power produced in wind farms in West Texas. But the laws of physics aren't governed by contracts, and it is entirely possible that the power that the purchasers in East Texas receive is actually prroduced in East Texas, and what the wind generation in West Texas actually does is to reduce the amount of power that must be transferred from East to West., thereby making power available in the East.

Cities are of more importance than local small towns, that must be an adminstrative decision .

The transmission losses depend on Voltage and distance of transmission.

Higher the Voltage - Less the transmission loss

Lesser the distance- Less the transmission loss

normally high voltage of 6.6 kV or 4.16 kV is transmitted and then step down transformers are set up to convert the supply.