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An important development in decarbonising energy consumption is the installation of shared rooftop photovoltaics on multiapartment buildings. It is widely agreed that the distribution of this relatively cheap electricity should be “fair” to all the users, and simultaneously maximise local use, to reduce global CO2 emissions and local electricity grid load. Most technical studies model or investigate distribution patterns on this basis, but without critical reflection on the energy justice issues that arise in sharing a common electricity source. This study brings together two distinct disciplines to move this discussion forward: technical issues in distributing shared photovoltaic output; and philosophical issues of energy justice. It sets this within Bhaskar's philosophy of interdisciplinary science which shows why narrow, highly specialist disciplines are necessary and why their findings must be brought together to inform us about the …