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Energy is not spent to mine bitcoin. Bitcoin is created automatically by the underlying algorithm and rewarded to validators in return for acting as validators.
Energy is spent performing arbitrary calculations that, by necessity, perform no useful function in themselves. The purpose of these calculations is to impose a cost on the process of acting as a validator node. The calculations can be discarded in their entirety and - so long as some other system of real world cost is put in their place - the entire system continues to function. Hence why it is even possible to discuss alternatives such as proof of stake.
The energy spent performing the calculations becomes waste heat. It is not stored. It cannot be extracted from the coins later. I cannot take bitcoins and use them to run a power plant.
If I buy power using the bitcoins, that power still has to be created by some means. It does not recover the power that was wasted for me to obtain those coins.
If the government owns shares in a company it can use the company to generate revenue in the form of dividends. If the government owns a bond it can redeem the bond at the completion of its term for interest on the face value. If the government owns gold it can use that gold to build electronics. If the government owns land it can build things on that land, extract resources from it, or use it for agriculture. These things all have value without being traded. Bitcoin only has market value; it has no use value. It cannot produce anything, it cannot be transformed into anything. It can only be bought and sold. It stores nothing, contains nothing, does nothing.
What makes gold valuable in this day and age beyond just peoples' willingness to pay for it?