This sector has, in what concerns hydropower, a long-term plan up to 2050 and prepares a medium-term plan every ten years, which is frequently updated. It is regulated by the ANEEL, the successor of the DNAEE, which operated the largest hydrometric network that was transferred to the ANA after its creation. If this creates a significant constraint for river basin planning, it also creates many opportunities because water reservoirs can be used for multiple uses. In fact, dams change the flow regime downstream, but create a more stable and reliable source of water for all uses, especially in areas affected by large variability of precipitation, as happens in semi-arid regions characterised by water scarcity.