So, with the introduction of the kinetic windmill, and the in-progress addition of the kinetic watermill, it feels like solar panels should also get a similar overhaul to remain useful. Are there any plans for this? If not, I would suggest adding a solar boiler tower, which produces HU and is scale-able. (And preferably also without laggy tile entity spam)
EDIT: Thinking about this a bit, I figured I'd post some more specifics for my own ideas of the above. I know none of this is probably particularly new or creative but this kinda thing doesn't really need to be innovative anyway, so;
The tower would be based on two separate blocks, solar mirrors (which would just be dumb blocks that don't do anything by themselves) and solar towers, which do the calculations. Tower blocks are intended to be stacked on top of eachother, and the height of the tower determines how many blocks away the tower will search for mirrors, with every additional tower block increasing the radius by one. Additionally, these towers can be set to either output up or down, with every tower block in the tower having to face the same direction in order for it to work. This, of course, determines if the tower outputs HU from the top or the bottom.
Every mirror found by the tower increases the amount of HU produced by the tower during the day by two to four, depending on which the IC2 team deems more balanced, with a possible buff in output if the tower/mirror is in a desert biome. There could also be a gradual warm-up and cool-down period at the beginning and end of the day. It should, of course, also do occasional checks on each mirror block, to determine whether that mirror is blocked by an opaque block or not, and invalidate that mirror if it is.