Byrne, J. (2017). The Promise of a Green Energy Economy. Green Energy Economies, 1-17. 

Chini, C. M., Schreiber, K. L., Barker, Z. A., & Stillwell, A. S. (2016). Quantifying energy and water savings in the US residential sector. Environmental science & technology, 50(17), 9003-9012. 

U.S Environmental Protection Agency. (n.d). Energy Efficiency for Water Utilities. https://www.epa.gov/sustainable-water-infrastructure/energy-efficiency-water-utilities 

Mehr, A. S., Gandiglio, M., MosayebNezhad, M., Lanzini, A., Mahmoudi, S. M. S., Yari, M., & Santarelli, M. (2017). Solar-assisted integrated biogas solid oxide fuel cell (SOFC) installation in wastewater treatment plant: energy and economic analysis. Applied energy, 191, 620-638. 

MosayebNezhad, M., Mehr, A. S., Gandiglio, M., Lanzini, A., & Santarelli, M. (2018). Techno-economic assessment of biogas-fed CHP hybrid systems in a real wastewater treatment plant. Applied Thermal Engineering, 129, 1263-1280. 

Wakeel, M., Chen, B., Hayat, T., Alsaedi, A., & Ahmad, B. (2016). Energy consumption for water use cycles in different countries: A review. Applied Energy, 178, 868-885.