For one thing, we need to keep in mind that (unlike the beliefs of most reality show contestants) wanting something is only a small part of success. Just because we set a goal doesn't mean that it's possible -- to a large extent, we are swapping dependence on imported oil for dependence on imported energy technology -- we create little, if any of the hardware/software needed to meet the 2045 goal -- we buy it all from off-island sources. Second, the use of battery storage to solve grid shortcomings is a dirty, expensive, and bulky way to go. To fully realize the potential of renewable energy, means addressing the peak load problem - a very smart grid goes a long way to doing that, but other measures will likely be needed that work on a system wide basis. Some of these measures could be storage, but ultimately it should be eco-friendly storage (like reversible turbines for pumped storage) -- batteries, whether privately or publically owned, are pretty far down on the eco-friendly scale.