Germany's government, for example, developed policies that promote grid integration and market access for solar energy. In addition to the technical capacity to enable trade across the network, policies need to provides incentives for homeowners to invest in the infrastructure - by giving them the opportunity, for example, to offset their initial investment by selling the excess electricity they produce. In addition to grid integration policies and technologies, governments must offer financial and tax incentives to develop the solar energy infrastructure and help counter the initial cost of these systems.