The price increase would be borne by both solar and non-solar customers, and in my opinion, it's the sort of thing that ought to appear on a ballot initiative. If the growth of solar power outpaces the increase in power consumption so that the utility actually has to decrease generating capacity, then another method (eg, a utility connection fee, or a higher price for the power returned back at nighttime) for paying for the infrastructure would be necessary. But, when people install solar on their home, they're buying infrastructure that they hope to use to improve their lives. If you have such a large majority of people understanding the value of infrastructure that they're buying if for themselves, then I don't think it will be too hard a sell to get them to pay for power grid infrastructure, especially since the price of power grid infrastructure alone would be significantly cheaper than the current price of power grid infrastructure + fuel for power generation, especially in Hawaii where they're bringing the fuel in a long distance on tankers.