Dutch transmission system operator Tennet, which also serves Germany, is planning to create flexible electricity demand and reduce grid congestion by promoting the use of smarter heating systems and heat pumps that can also be powered by solar and wind energy. According to its experts, intelligent control of heat pumps may result in the creation of between 0.5 and 1 GW of temporary grid flexibility by 2030.
The use of heat pumps and more flexible heating systems coupled to wind and power generation may be particularly beneficial for countries with serious grid congestion issues like the Netherlands.
This is the main conclusion of a recent report published by Dutch electricity transmission system operator (TSO) Tennet, in which its experts analyzed how the use of heat pumps and smarter heat networks may contribute to the creation of more flexible electricity demand, which would, in turn, have the twofold advantage of reducing fossil fuel consumption and not wasting surplus renewable energy generation during peak hours.
The Dutch high-voltage grid operator said that in hours with poor renewable energy production, part of the heating systems could be idled temporarily, and in hours with a lot of electricity from the sun and wind, the heat systems could be powered by these two sources to provide extra heating. “In 2030, this concept could already provide between 0.5 and 1 GW of temporary flexibility and, in order to achieve this, the heat pumps must be intelligently controlled,” Tennet explained.
The flexible demand created by this approach would help to level off peak loads during strong generation of wind and solar if the capacity of the electricity grid is in danger of being exceeded. “This flexibility is needed to make maximum use of variable solar and wind generation in hours of abundance, and to reduce electricity demand in hours without solar and wind electricity,” the authors of the report affirmed.
Flexible heat pumps would be key in this scenario as they can switch back temporarily, while a well-insulated building can remain sufficiently heated for a certain time. Furthermore, hybrid heat pumps that can be powered by both gas and renewables would also represent an optimal solution, as they can temporarily rely on the fuel in the event of electricity shortages. “This reduces the peak demand for electricity and keeps homes warm,” the report notes, adding that on days with abundant solar and wind power production, heating systems with heat storage may also save some sustainable heat to power the building the following day.