in brazil for example private investors are asked to collectively elaborate a planning proposal for the grid connection before they bid on upcoming renewable generation projects incentives for clean energy production vary from one state or province to another for example in the chicago tristate metroregion which straddles three us states illinois indiana and wisconsin different targets for the share of renewable sources of energy in the state energy mix together with different criteria for deciding which projects qualify as renewableenergybased electricity generation undermine efforts to attract clean energy investments to the metroregion oecd e in other cases national laws may undermine locallevel investments in clean energy for example until polish national policy prevented municipalities from taking ownership of waste generated by their inhabitants and businesses