Figure 4: Marginal heat production price as a function of electricity price.
load the storage tank. The heat in the tank can, at a later stage, be unloaded if production from these prioritised sources with low heat production prices is not delivering enough heat. The heat price from each heat source can be seen in Figure 4, which shows the marginal heat price (OPEX costs) for the different technologies. If the electricity price is below 0 £/MWh, an electric boiler is a priority. If the electricity price is below 120 £/MWh, the heat pump is a priority, and if it is above 120 £/MWh, natural gas
CHP is a priority. If hours with the lowest heat price are chosen first daily, the average heat price can be kept at a low level. Additionally, it can be avoided to run the gas boiler more than necessary. At the end of the period, storage is on a high level, which in the plant's real planning system could make it possible to take out some more of the prioritised technologies with relatively high heat prices, and then the heating price would go further down and value of heat storage up. Income from selling
Figure 5: Heat storage level example from Table 5.
24 HOTCOOL no.6 2024
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