If governments forced miners to use solar energy only, would Bitcoin become more sustainable and valuable, or would it reduce mining capacity drastically?
This is not possible, all governments in the world can not think the same. When China banned bitcoin mining that time in 2021 or so, it was an opportunity for country like Kazakhstan which encouraged bitcoin mining and the country is using coal for energy generation. Know that if a country say something, another country may say another thing.
What if some big economy made it mandatory to do mining only using solar energy ? Will it have any impact on bitcoin ?
I actually feel that if a major country forces Bitcoin mining to use only solar energy, it would seem more like political intervention than a concrete solution. As we know, Bitcoin is inherently energy-neutral; miners will always choose the most efficient and cheapest energy sources, and the global trend is already moving towards renewable energy without regulatory pressure.
This kind of regulation would actually reduce competitiveness for miners in the country that created the regulation because solar energy is not yet stable across the region. As a result, many miners would migrate to other countries with more liberal regulations, where the Bitcoin network would still operate normally thanks to its difficulty adjustment mechanism.
This means that Bitcoin cannot be weakened by unilateral regulations alone. Instead, this kind of regulation would demonstrate the resilience of this network, which always finds its own way out, while also emphasizing that Bitcoin is far stronger than any political or regulatory intervention.