Hidden energy vulnerability refers to situations where households are at risk of harm from energy deprivation but are not captured by common indicators of energy poverty or do not request help. Through interviews with 32 intermediaries from health, housing and social service organisations, the paper develops six forms of hidden energy vulnerability: underconsumption entailing privation, incidental masking, disguised vulnerability, intentional concealment, failure to recognise the health risks of cold homes and ignored energy vulnerability.