Energy is extremely difficult and expensive to store, it's not fungible over a time period. This is why energy rates fluctuate during the day. It's also not fungible between consumers not connected to the same grid.

When generating energy (either with fossil fuels or renewables) energy is often wasted because there is no immediate consumer or way to store it.

What you say _can_ be true, for example additional consumers of energy on the national grid, during times of high demand, will likely result in more energy production. It is not true as a rule though.