Have you considered going off-grid entirely? The costs of photo-voltaics is coming down. Are you high enough where you could augment it with a windmill? You can get those starting at around $10K and up depending on size and power output. You could do a whole bunch for way less than $100K, and maintenance on the systems is likely to be considerably less than the cost to buy the stuff from the utility over the years of life of any system.