One of the (not so many) times I agree with stompix here.
We all have to understand that corporations are in it for the money.
A good image benefits them and they're going to invest a lot in it, but sometimes that also involves being outright deceitful or just lying to get people to think you're doing something good.
Is mining based on renewable energy? Maybe yes, but only to some extent.
To claim that it's based on 50% renewable energy would be a lie though.
First of all the energy draw of a miner is constant, but the energy produced by renewable energy sources never is.
Operators of large mining facilities can strike meaningful agreements with energy producing companies, because they can help them monetize overproduction.
But that can also mean that the operators will be forced out of the network (either financially or through agreement) when there's high demand that the network has to cover.
They will then have to fall back to more traditional and on-demand ready energy production methods such as fossil fuel (hence the coal). \
One could say that since energy production factories often can't run under capacity and are therefore usually over-producing energy, that if bitcoin miners mostly utilize that then their impact on their environment is mostly negligent since they don't create a carbon footprint that wouldn't be there without them. In this fashion, the claim that bitcoin miners run 50% on renewable energy could have some meaning IF these renewable sources had a positive impact by cutting down the production needs for regular energy consumers while the miners don't have to rely on them. But the coal mines/energy factories being owned and operated by BTC mining companies make this all these Greenwashing claims seem very deceptive.
I actually haven't verified this from a third party source but at least in Ocean's introductory livestream it was claimed that
Bob Burnett's Barefoot Mining renovated and turned on an old hydroelectric plant to utilize as the energy source for a BTC mining farm. Supposedly attendees even received a tour in the facility. I'm not gonna say you should take them at their word, these things are hard to verify anyway. But if true, then we should give them credit for doing environmentally conscious mining the way it should be done. Hydro, contrary to solar whose productivity dwindles year by year, has a long lifespan, and even if bitcoin mining ends a few decades down the line, hydro projects could continue to be still utilized by future generations.