Much of the investment is intended to contribute towards the use of renewable energy. Policies and measures within the region identify the need to create stronger power systems that take advantage of domestic energy resources, while also increasing grid capacity and resiliency. Resources being tapped for generation are numerous, though solar and wind power dominate recent developments in the sector because of broad availability of resources, rapid deployment timelines, low environmental impacts and increasingly affordable technology prices. In urban areas, rooftop systems have the advantage of locating generation supply at the demand centre. For residential, commercial or industrial consumers who are also suppliers, those systems can offer the benefit of avoided costs of electricity, and, depending on local policy frameworks, revenue from power sales to the grid. As an example, power market liberalization in Japan along with its feed-in tariff system has created a boom in small-scale solar power producers, which include individuals and small businesses.