I think you might need legislation to allow power of 50,000 volts to be run like this because of line drop if you went below about 25,000 to 50,000 volts.
My idea would be to to the right or left of a highway you dig a trench which would be covered but would be about 4 feet deep. You would have locked access points along the way but you would have open covered channels about 4 feet deep. The 25,000 to 50,000 volt lines would be about 2 feet down and waterproof in case water from flooding got in there at some point so people still could have power. This way you could still send power long distances even if winds above this 4 foot deep channel that would be covered was under 10 or 20 feet of flooding water. However, most of the time electrical maintenance workers would be able to repair the line if they temporarily shut the line or lines down first. So, you likely could have 10 or even 20 lines (if they were properly shielded from each other going down this 4 foot deep 2 foot or more wide electrical cable trench that might go thousands of miles across countries in some instances running from hydroelectric power plants and the like.
And also closer to where the power would be used would be wind and solar panels with Batteries on homes to store excess power wherever that was practical to do too.
Also, people would have back up generators at companies and homes that were off the grid completely in the sunnier states especially in the western United States.
Once again: Why do we need this? Winds moving steadily towards 200 to 300 mph more this century when they come in various forms like hurricanes, Tornadoes and storms and floods and droughts of all kinds worldwide.
Because all this century winds will be increasing in velocity and power because of melting ice caps and increasing heat stored in the oceans of the world. Though this heat is also stored in Lakes and Rivers and reservoirs too, the biggest problem for mankind and life on earth likely will be the oceans as heat batteries. Another problem that is vexing people is how the Gulf Current in the Atlantic and as this current travels all over the world under various names in different regions, places like Europe are likely to become more frigid because of these changes to the Gulf Stream this century too. So, for example, places like the British Isles and Scandinavian Countries will likely get a lot colder in winters and summers and all seasons in between.
Once you get winds above 150 mph gusts to 200 and 300 mph it blows down not just some trees but also all trees in a region. If you look at pictures of Caribbean islands hit with high velocity hurricanes every blade of grass and every tree is basically gone or down off islands hit this hard by hurricane winds.
We are headed towards (slowly) problems like you see exaggerated in the movie "The Day After Tomorrow" for example, regarding Europe and the Northeastern U.S. for example.
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