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I was wondering how the 70% efficiency compares to copper. I assume copper isn't 100% efficient, but how efficient is it?

Thanks for answering questions here!

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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...

End to end efficiency is absolutely critical for making any wireless power endeavour viable.

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.

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