A new market is expanding rapidly for solar batteries in Australia. Homegrown company Allgrid have welcomed the competition posed by Tesla's entry into the market resulting in increased customer enquiries. Allgrid believe that their product will be significantly cheaper than Tesla's batteries because of their reliance on cheaper lead acid gel batteries. Could a similar market develop in the UK? Are lithium-ion or lead acid gel batteries sufficiently cheap to be considered as part of a landlord's ongoing investment in commercial property to meet the 2018 minimum energy efficiency standards?