Can you just add a bunch more solar arrays? For right now (until we get the big breakthrough), solar is the cheapest form of 'free' energy right now... There still is Sun where you live. I grew up in the PNW Washington where yeah, in the Winter Solstice it may get dark at 3:30pm sometimes... It does suck, but there is some Sun, so to me it would be important to harvest as much of it as I could while it was up, and be able to store it. Yeah and storage costs a bunch too, but even lithium batteries have gotten way cheaper, or maybe store the energy in other ways like hot water or something.
And don't forget the easiest way, which is to use less energy. Focus on retrofitting your house into a 'passive home', use dimmer, more efficient lighting, build a house that doesn't need a lot of energy. I know on our coop ranch we're building, the whole theme is building passive, or net-zero style homes, so we don't need to harvest as much sun energy. Maybe you've already done all that. But I think it's a never ending learning curve, there are always new tricks we can learn to harvest more, and use less, to evolve into higher efficiency living...