Researchers Martin Rüdisüli, Sinan Teske, and Urs Elber of the Swiss Federal Laboratories for Materials Science and Technology (EMPA) have studied what will be needed to make Switzerland able to use only zero carbon energy. Among their main conclusions is that the country can produce more electricity than it needs from renewable sources in the summer but will need to import electricity from its more southerly neighbors in winter.
In a report published in the journal Energies, they used data provided by Swissgrid to determine the current demand for electricity in quarter-hour increments year round. They then posed the question, “How would demand change once most heating and transportation in Switzerland is electrified?” The answer they came up with is that demand will increase by approximately 13.7 terawatt-hours on an annual basis.
That figure further assumes that significant steps are taken to shift to electric vehicles where possible in the transportation sector and to improve the energy efficiency of existing residences and commercial structures. According to a report in Science Daily, the research assumes heating requirements of all buildings will first be reduced by around 42% through renovation measures and that 3/4 of the remaining heating requirements in houses and apartments will be achieved using electric heat pumps. It further assumes about 2/3 of all private car trips will be in electrically-powered automobiles.
The research focuses on five areas. First, replacing conventional furnaces with heat pumps. Second, because Switzerland proposes to end its use of nuclear power, each nuclear power plant must be replaced with about eight times the photovoltaic output. A nuclear plant delivers around 8,000 hours of electricity per year but a solar cell delivers only about 1,000 hours a year. As a result, solar panels will need to be installed on virtually all available surfaces.
Third, a dramatic increase in electrical storage capacity using all available technologies including batteries and pumped hydro as well as geothermal and technologies that convert electricity into chemical energy sources. Fourth, they recommend heat storage technologies so the use of heat pumps can be reduced as much as possible in winter.
Fourth, create seasonal heat storage facilities so that the electricity requirements of the heat pumps can be reduced in winter. Fifth, new HVDC transmission lines that will bring electrical power from sunnier southern countries to Switzerland in the winter when electrical demand is highest. A bright spot in the analysis for electric vehicle advocates is that EVs will not unbalance the grid as they can be charged when electricity is plentiful, assuming a proper charging infrastructure is created.
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