…zero grid import at around 70kWh, same size as anentry level Tesla car battery pack. Zero grid import household will use grid like a petrol generator, only relying on it very rarely. The household will have an oversized solar system and make significant contributions to overall national electricity demand as well as not relying on the national grid for its capacity requirements. Eventually Option #2 will become the standard as batteries continue their cost decline. In order to support advancements in the technology a battery storage target of about 100MWh per month Australia-wide should be set. With an upfront subsidy initially set at $300/kWh.