This study tested the influence of both environmental education (EE) and commitment interventions among teenagers for promoting energy and water conservation at home. Conservation behaviours were measured in two ways – directly and through questionnaires – prior to and after the interventions. Results indicate (1) EE participants may have saved more energy than non-participants and (2) those signing a public commitment saved more energy and water than those who did not. Results from the questionnaire measures demonstrated the importance of EE for promoting ecological self-identity and a personal norm for energy conservation. Based on these results the use of commitment interventions in EE initiatives for promoting conservation behaviours among teenagers is proposed.