The system also requires power as it pumps water back into the upper reservoir (recharge). Department of Energy defines pumped storage hydropower (PSH) as, “A configuration of two water reservoirs at different elevations that can generate power as water moves down from one to the other (discharge), passing through a turbine. While there are many technologies contending for leadership in grid storage, there are two meetings nearing commercial viability in Michigan: pumped storage hydropower and battery storage. She said, “We’re going to bring hundreds of gigawatts of clean energy onto the grid over the next few years and we need to be able to use that energy wherever and whenever it’s needed.” Here in the US, Energy Secretary Jennifer Granholm announced a plan last summer to reduce the cost of grid storage by 90% within the decade. In the past, the bulk of this extra energy came from fossil fuel plants that were fired up and down with demand.” Energy Storage World Forum, a trade conference, stated, “Since the electrical grid has existed, so has the need for stored forms of energy that can be drawn on to meet times of peak demand and regulate frequency. Originating in Italy and Switzerland at the turn of the century (in the form of pumped hydro storage), grid storage has only increased in demand as utilities around the world turn to renewables and distributed energy resources (DERs). Using a definition from the University of Michigan Center for Sustainable Studies, grid storage is “the process of converting electrical energy into a stored form that can later be converted back into electrical energy when needed.” Storage creates greater reliability in renewable energy supply, giving suppliers a backup when needed. However, no amount of renewable capacity can ensure consumers get power if the wind isn’t blowing or the sun isn’t shining. Michigan is working hard to transition to greener generation options.
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