Indonesia as a country with a large population has challenges in being able to provide housing that applies a sustainable concept but still has to be affordable for the community. Therefore, this research aims to compare the implementation of the three pillars of sustainability from several Neighborhood Sustainability Assessment. The method used in this research is a comparative analysis in assessing the concept of sustainable in subsidized housing and descriptive analysis to provide suggestions for improving the sustainable application in subsidized housing. The assessment carried out by the researchers using direct observation, masterplan interpretation and satellite photo interpretation. The results of the assessment using the Neighborhood Sustainability Assessment of several countries on subsidized housing for Perumnas Parung Panjang obtained silver level from LEED, pass level from BREEAM and bronze level from Greenship. On the other hand, from the aspect of the three pillars of sustainability, it is known that the economic pillars (36.27%) and the environmental pillars (32.14%) have a lower percentage of variable fulfilment compared to the social pillars (61.59%), so that several corrective steps are needed to maximize the application of the concept of sustainable and obtained a better NSA assessment score.

Affordable housing is often associated with low-cost housing that pays lack of attention to the principle of sustainable housing. It is due to having limited price which meet the decree of Minister of Public Works and Public Housing No.552/KPTS/M/2016. However, the application of solar panels in the affordable housing has potential of cost efficiency by replacing the cost of monthly electricity payment with the initial investment and maintenance cost of a solar panel network in the housing. The potential of electricity power in Parung Panjang housing is calculated by applying spatial analysis using GIS. Parung Panjang housing has the total area of 214,1 hectares. The results of spatial analysis showed that the potential of roofs that can be used for solar panel installation is 44,6 hectares. By managing that area and electricity payments, the potential for solar cost of energy is 929.14 IDR/kWh. It is lower than the cost of energy from State Electricity Company of 1,352 IDR/kWh. Besides, the implementation of solar energy in large residential area is more efficient than in a single house and small area.

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The advancement of communication technology is shortening the lifetime of mobile phones (MP), resulting in a phenomenal increase in mobile phones waste (MPW). However, instead of recycling their obsolete devices, customers shelved MPW for the personal data stored inside. This study aims to estimate secondary minerals contained in MPW stockpiled by Indonesians. “Consumption and used” method was employed to assess the quantity of MPW generated in this country based on the data of mobile subscribers. Considering that MP life span was around 3 years, and about 38% of obsolete MP were hoarded by their owners, this study revealed that about 339.69 million units of MPW were waiting to enter the reversed logistics. This volume of MPW may generate economic intrinsic at approximately USD 508 million from valuable metals such as 80,949 Kg of silver, 8,873 Kg of gold, and 2,547 Kg of palladium. It implied that hoarding MPW impedes the noble goal of recycling; that is to promote sustainable materials management (SMM) since mining precious metals from e-waste will reduce the demand of virgin minerals directly extracted from nature and reduce the environmental impact. This paper highlighted that it is imperative to develop a sustainable system to support the mineral supply chain.

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