As living costs rise and fuel prices soar, community energy sharing could help cut costs and boost resilience, University of Waikato research shows. A pilot project led by University of Waikato postdoctoral researcher Dr Min Zhang and Professor of Software Engineering Mark Apperley from the University’s Ahuora Centre for Smart Energy Systems focused on how households, schools and businesses on a section of the western side of Waiheke Island could share locally generated solar energy rather than relying solely on the national grid. Their study proves a concept that could be used in communities throughout New Zealand. Working with local community group Electrify Waiheke, the Waikato researchers collected energy data from households, a vineyard, a pottery studio and a primary and high school to model how a local energy-sharing system could work. The section of the island was chosen for its representation of the diverse makeup of residents, and the fact that many in the community are very interested in exploring this opportunity. The concept allows households with solar panels and batteries to sell excess energy directly to neighbours at a lower cost than standard market rates. “Instead of selling surplus solar power back to the grid at a low price, households can share it within the community, creating benefits for both buyers and sellers,” Dr Zhang says. The study also highlights the potential for shared infrastructure, such as community-scale solar installations or a shared large battery, reducing the need for individual households to invest in expensive systems. She also notes the modelling shows even households without solar panels can save money by participating in the system. Additional savings can be achieved by shifting energy use – such as hot water heating and electric vehicle charging – to off peak times when electricity is cheaper. “So instead of charging your