Coupling inefficient renewable project with bitcoin mining operation, could lower the marginal cost of the whole project, helping spreading the renewed le usage.
Bitcoin mining and renewables in the form of solar and wind are not making a good combination.
The whole idea of a battery is to accumulate power when is excess production and supply it back when there is demand, bitcoin mining is not storing energy, it's consuming non-stop the same amount of power. While it helps burning energy when there is extra production it also drives up consumption when there is peak demand during the daytime.
A miner running on solar power will have to come up with at least 3 times the consumption as storage capacity assuming no day without sun, a single S19pro burns in 18 hours 60kwh, a tesla powerwall has 13.5kwh, a battery on the entry-level tesla S is 70kwh.
The cost is simply prohibitive.
Obviously what the study do not tell you is why bitcoin mining should be used only in renewable energy plants and not atomic plants, who suffer from the exact same issue of production/demand mismatch.
Atomic plants are actually the best match for bitcoin mining.
Unlike solar who delivers power at the peak time for demand and goes black at night, atomic power's weakness is that it can't shut down at night and power up at daytime, nuclear power while reliable is not that easy to turn on and off. Bitcoin mining could take advantage of this excess power that is produced when nearly nobody wants it.
Bitcoin mining and nuclear power are a perfect match, constant power needs, production is not influenced by weather, no need to be near a coal mine and thousands of freight trains carrying fuel, they ran on fuel rods that go for years, and as long as you have some water nearby you can set them in cold areas so mining farms would need no cooling.
But, we're living in an era where the eco-green propaganda would turn install against this idea.