“…The worldwide energy consumption will escalate from 579 EJ (Exajoules) in 2012 to 860 EJ in 2040, causing 48% increase, and in the last two decades, a considerable increase in energy consumption of developing countries have been observed due to economic growth and growth of population (Scheffran, et al, 2020).As per the findings of Li, et al(2014), buildings account for 40%, 39% and 37% of total energy consumption in the US, the UK and the European Union respectively. Further, Sri Lanka Sustainable Energy Authority (SLSEA) reveals that the largest energy consuming sector was the household and Industrial sector, accounting for 69.6 % of the total energy demand of the country (SLSEA, 2018).…”