The CO Variation of Heating Load and Solar Energy Production with the Electricity Price Variations in Denmark
Abstract
There are large variations of the electricity price from hour to hour in Denmark. This is much dependent on the large fraction of wind power in the electric grid (already about 20% with an expansion to 40% planned). The electricity prices are very low when the wind power production is large. Simple plotting of the electricity price versus heating load and solar radiation, indicate that there can be a positive match when using electricity as a backup source in a solar combi system. The electricity is used to charge the auxiliary part of the storage, in low cost periods. This also gives a demand side management effect for the electric grid. If enough auxiliary storage capacity and smart forecast based control is introduced in the combisystem, this match can be further used to increase the utilization of renewable energy sources, in an economical way. Presently the final customer electricity prices are variable only for a few customers on trail, but it is expected to become more and more common in Denmark.