Acid neutralizarion is 10x too fast.

[crimsonarmy]

Not even the power boost on Vulcanus can make solar a viable primary power source.

It's not the power boost that's most important (though it certainly helps) but the hugely reduced materials cost. On Nauvis, even ignoring the space requirements, the capital cost is very large. Solar power requires large quantities of iron and copper, which on Nauvis are the limiting resources, and consequently valuable. But on Vulcanus they are effectively free, so the only question is 'Do I have the space for this?'. Until the answer to that question becomes 'No', solar is a viable choice.

To add to this: the fast day night cycle on Vulcanus also boosts solar as more of the space can be devoted to panels rather than acumulators