Bzzzt, wrong. There is no such thing as an "electricity market."

Of course there is. By definition. If you buy electricity from any supplier you pay a market price.

You appear to mean an Exchange. And no, there isn't one, for retail customers anyway.

A megajoule/square meters double standard, in other words, with 100 % reserve requirements.

What on earth are you talking about?

Proportional Units - eg billionths - in Pools of land/location rentals will change hands in exchange for whatever buyers and sellers agree, and by reference to whatever value standard they wish to use, fiat or energy.

If a location rental is charged by a community in respect of land of which they have custody then what are essentially local Treasury branches would be in a position to issue redeemable credits based upon this rental.

It's not difficult to value land/location rentals. You should know, the Danes have been doing it for years.

So it's not difficult to manage the issue of Units redeemable in location rental value.

And it really isn't difficult either to manage the issue of Units redeemable in energy by (say) a renewable energy producer or any other producer, come to that. A damn site easier than attempting to measure carbon dioxide emissions.

Both of these would be currencies backed 100% by value. They are consensually acceptable, or not, and are not imposed by fiat.

The key point is that Units of location rentals, and Units redeemed in renewable energy, or out of energy saved, both allow value to be received now in exchange for Units to be redeemed later with intrinsic value created at nil cost.

Unlike units of fiat currency, which is redeemable for......more fiat currency with no intrinsic value.

"The future is already here -- it's just not very evenly distributed" William Gibson