I searched for examples of viable bitcoin mining installations powered by solar but didn't find much. I did find a report looking into the viability of it and it didn't look promising. They were using a hypothetical example in California and stating that it would take 8 to 9 years to pay back - I couldn't quite picture anyone putting in that sort of investment into something that's so volatile (bitcoin, not the sun). They also needed a large number of panels and not everyone has the space. Also not everyone lives in California and obviously it would only provide power during daylight hours unless you add energy storage which is yet more cost. In short I call BS. Do you power your rig via solar? If not, why not?And you'll just selectively ignore the myriad examples of Bitcoin miners investing in building solar into their operations, or taking over old hydroelectric dams to cherry-pick the one that bought an old coal plant, instead of letting it rot.
The grids are designed to cope with millions of users so your individual usage spikes really just don't matter. The real issue (at least to the planet) is whether you're needlessly using way more power than you need in the vague hope of making a quick buck.You're right, their electricity surges and ebbs in ways which are unpredictable that make running a grid a nightmare for operators, versus Bitcoin miners that consume at a constant, steady rate, are amenable to shutting down during emergencies, and sustain usage during the overnight hours (which grid operators need because the power they generate has to go somewhere, and they can't just shut the plant down for the night).