You talk as if the incredible amount of energy around us is unlimited. We pay for energy and we spend an inordinate amount of consideration towards thinking on how to "save energy"
Energy is therefore limited and, as illustrated above, a highly practical concept.
Energy on the earth isn’t limited. There is tremendous energy entering and leaving our sphere at all times. There are forms of energy stored in ways that we don’t understand how to harvest and distribute, yet lay latent. You could theorize that the total energy in the universe is fixed, yet incomprehensible vast and largely inaccessible.
You are correct that the about of energy available for human consumption is finite in a given moment in time. Every choice for how energy is distributed collapses other possibilities. Yet, the ability of humans to capture and direct energy ever grows with the passage of time.
Up until about 3-4 generations ago, our species depended on beating other creatures to move us around, and burning trees for warmth. Now the same planet with the same or less resources is able to provide ~250 times more usable energy.
But none of that energy is available to use. The only metric that matters is available energy. If all the energy you’re describing was available for use nobody would be paying for energy and we’d never have huge power outages.
Technological growth is luck and also likely limited. The zero sum nature of the economy comes from the context of a transaction.
Transactions and exchanges are zero sum, technological growth is not. But increasing technology is both a combination of luck and arguably limited.
Energy is therefore limited and, as illustrated above, a highly practical concept.