Economical valuation for measuring renewable energy efficiency as the implementation of smart city concept at Surabaya City

Energy is the most important part of supporting human necessity. For this while, the crude oil energy which is mostly needed at Indonesia are fuel oil and electricity. Unfortunately, the domestic crude oil reserves are diminishing and global crude oil's price has always fluctuated. Thus, the development of renewable energy is necessary. However, the alternative energy development in Indonesia still relies on fossil energy, which is not environmental friendly yet. Smart energy is one of the existed approaches in the concept implementation of smart city. Surabaya city has already had a number of innovations in smart energy implementation of alternative uses in utilizing renewable energy for particularly public services, such as solar cell, garbage power plant, and the application of wind turbine. Some of the mentioned alternative energy have been tried at government's buildings, other government's facilities, and public street lighting. There are some occurrences of problems such as the lack of readiness of the supporting facility, the energy production made a few trial project slowed down to be implemented. This study is trying to economically valuate about the efficiency level of renewable energies which have been tried. This study aims to offer an advantage of choosing the best alternative energy to be mass implemented. Thus, the smart city concept, especially smart energy, can be thoroughly implemented using the most efficient type of energy.