The integration of electricity markets around the world has increased the importance of congestion between countries/states and has initiated a discussion of how to harmonize network tariffs. This paper analyzes how the transmission capacity and the transmission cost, such as a transmission...

In 2008, the European Commission investigated E.ON, a large and vertically integrated electricity company, for the alleged abuse of a joint dominant position by strategically withholding generation capacity. The case was settled after E.ON agreed to divest 5,000 MW generation capacity as well as...

This paper provides a prospective and retrospective quantitative assessment of the impact of a passive vertical integration between a large electricity retailer and a large electricity generator in the Australian National Electricity Market (NEM). We adapt a standard model of fixed-price forward...

The Northeast region of China has been used as a testing ground for the creation of a functioning wholesale electric power market. We describe the profile of generation assets throughout the region and the ownership of plants. We calculate the 4-firm Concentration Ratio (CR4) and the...

In November 2011 Sweden abolished the uniform national electricity price and introduced separate price zones. This was the result of an antitrust settlement between the Commission and the Swedish network operator, which was accused of discriminating between domestic and export electricity...

In the process of regulatory reform in the electric power industry, the mitigation of market power is one of the basic problems regulators have to deal with. We use experimental data to study the sources of market power with supply function competition, akin to the competition in wholesale...

It is the objective of this paper to quantify the significance of fundamental factors (like rising fuel costs) and of the increasing exercise of market power on rising prices in the German wholesale electricity market. A successive MIP/LP approach was used for this. The calculations show that,...

Allegations of market power in wholesale electricity sales are typically tested using price-cost margins. Such tests are inherently suspect in markets, such as electricity, subject to capacity constraints. In such markets, prices can vary with demand while quantity and thus cost measures remain...

Regulators in Belgium and the Netherlands use different mechanisms to mitigate generation market power. In Belgium, antitrust authorities oblige the incumbent to sell financial Virtual Power Plants, while in the Netherlands regulators have been discussing the use of physical Virtual Power...

The Spanish Electricity spot market is highly concentrated on the seller and the buyer side. Furthermore, unlike electricity spot markets in other deregulated systems, large buyers and sellers are typically vertically integrated. This allows both large net sellers and large net buyers to...