You can install some battery storage in your house (to become more self-sufficient), charge your electric vehicle or combine several households in an area into a microgrid. The old style lead-acid batteries are high-maintenance, complicated to set-up, bulky, need ventilation and are not pretty to look at. New storage options have been developed (US Tesla Powerwall and Enphase Home Energy Solution with lithion-ion batteries) that allow you to more easily become more self-sufficient. You could perhaps compare the Tesla batteries to the iPod, where before there were mp3 players - basically this product is just a lot better than what what was offered before, and cheaper! Prices start from approximately NZ $5,000 (including GST and freight). The first units are expected to arrive sometime in NZ in early/mid 2016.