Abstract
Renewable energy shares in electricity markets are increasing and therefore also require an increase in flexibility options. Conventional electricity price modelling with optimisation models in thermally dominated markets is not appropriate in markets with high shares of renewable energies and storages because price structures are not adequately represented. Previous research has already identified the impact of uncertainty in renewable energy feed-in on investment and dispatch decisions. However, we are not aware of any work that investigates the influence of uncertainties on price structures by means of optimisation models. Appropriate modelling of electricity price structures is important for investment and policy decisions. We have investigated the influence of uncertainty concerning water inflow by applying a second stage stochastic dual dynamic programming approach in a linear optimisation model using Norway as an example. We found that the influence of uncertainty concerning water inflow combined with high shares of storages has a strong impact on the electricity price structures. The identified structures are highly influenced by seasonal water inflow, electricity demand, wind, and export profiles. Additionally, they are reinforced by seasonal primary energy source prices and import prices. Incorporating uncertainties in linear optimisation models improves the price modelling and provides, to a large extent, an explanation for the seasonal patterns of Norwegian electricity market prices. The paper explains the basic pricing mechanisms in markets with high shares of storages and renewable energies which are subject to uncertainty. To identify these fundamental mechanisms, we focused on uncertainty regarding water inflow, but the basic results hold true for uncertainties regarding other renewable energies as well.
Highlights
Electricity markets today are increasingly moving towards systems based on renewable energies.This results in the additional need for flexibility options
We found the following papers that examine the relationship between long-term uncertainty and electricity market prices
We have shown that electricity market prices modelled with a deterministic optimisation model are constant in markets with high shares of renewable energies and storages
Summary
Electricity markets today are increasingly moving towards systems based on renewable energies. This results in the additional need for flexibility options. If renewable energies should provide most of the power, seasonal storages or similar flexibility options become more relevant. The expansion of flexibility options in Germany is, among other things, reflected by the construction of transmission capacities to Norway, to utilize existing storage capacities. As renewable energies depend upon uncertain factors like water inflow, wind or solar irradiation, long-term uncertainty regarding these factors will become more important. As electricity markets are changing, it is likely that electricity market price structures will change. Predicting electricity market prices is important for estimating investment decisions and retail
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