iNUMBER (iNtegrated Urban Model for Built Environment Energy Research) is a four-year (2017-2021) research collaboration between India and United Kingdom to help cities reduce their energy demand and improve their electricity and water services. This goal is aided by four world class academic institutions in India and the UK (CEPT University [Ahmedabad]; Indian Institute of Technology Bombay [Mumbai]; University College London [London], and the University of Oxford [Oxford]), as well as business, and non-profit partners.