Mette Bjørndal

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The issue of finding market clearing prices in markets with non-convexities has had a renewed interest due to the deregulation of the electricity sector. In the day-ahead electricity market, equilibrium prices are calculated based on bids from generators and consumers. In most of the existing markets, several generation technologies are present, some of(More)
BACKGROUND The causes of subclinical hyperthyroidism have only been reported from clinical studies. AIM To determine the prevalence and pathological causes of reduced serum TSH levels in subjects recruited from an epidemiological survey. MATERIAL/SUBJECTS AND METHODS Serum TSH was measured in 7954 subjects in the 5th Tromsø study. Subjects with serum(More)
Regulators of electricity distribution networks have typically applied Data Envelopment Analysis (DEA) to cross-section data for benchmarking purposes. However, the use of panel data to analyse the impact of regulatory policies on productivity change over time is less frequent. The main purpose of this paper is to construct a Malmquist productivity index to(More)
In this paper, we investigate methods for managing congestion on the grid in the Nordic power market. Specifically, we have considered the differences between using counter purchases as opposed to pricing out the transmission constraints of the grid. We show that the specific method used for congestion management greatly affects prices and therefore the(More)
Our objective is to find prices on individual items in a combinatorial auction that support the optimal allocation of bundles of items, i.e. the solution to the winner determination problem of the combinatorial auction. The item-prices should price the winning bundles according to the corresponding winning bids, whereas the bundles that do not belong to the(More)
In Norway, an incentive-based regulation of electricity distribution companies, based on revenue caps, was introduced in 1997. The revenues are adjusted annually, and the new revenue cap is determined on the basis of last year's revenue cap, adjusting for inflation, productivity improvement, and load growth. The idea behind the load growth compensation(More)
In this paper we present a bilevel programming formulation of a deregulated electricity market. By looking at a deregulated electricity market in this format we achieve two things, i) the relation between a deregulated electricity market and other economic models that can be formulated as bilevel programming problems becomes clear, (i.e. Stackelberg(More)
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