We thank Joe Grainger, from Centre for Net Zero (CNZ), for his critical logistics and project management. We thank Jack Ashworth, Greg Baxter, Tessa Hillen, and Vania Milkova, from Octopus Energy Limited (OEL) in Great Britain, and Claudia Cuñat, Anna Casas Llopart, and Iñigo Vallejo, from Octopus Energy España, S.L.U. (OEE), for their support and partnership in this project. Their commitment to the implementation of the intervention was remarkable. We thank Navya Kumar for excellent research assistance. We thank Andy Hackett, from CNZ, for specific comments on the text of the paper itself. We thank Sophie Alderman, Louise Bernard, Emma Burns, Natalia Fabra, Simon Gill, Marten Ovaere, Iona Penman, Marcia Poletti, Alex Schoch, Celyn Simmonds, Phil Steele, Melita Van Steenberghe, Izzy Woolgar, and Lucy Yu for their valuable insights and comments. Conflicts of Interest: AS and YS are paid employees of Octopus Energy Group Limited (OEG), working as researchers in CNZ. DLG was a paid employee of CNZ at the time of trial implementation, and is now a paid employee of OEE. RM is a consultant to CNZ. CNZ operates as an autonomous open research institute, but CNZ, OEL, and OEE are all part of OEG. The four authors made final decisions regarding experimental design, data analysis, and writing; all mistakes herein are ours alone. The pre-registrations and pre-analysis plans for the three field experiments are: AEARCTR-0015455, AEARCTR-0016220, and AEARCTR-0016221. The views expressed herein are those of the authors and do not necessarily reflect the views of the National Bureau of Economic Research.