In electricity markets of modern electric power systems, many generation companies, as major market participants, aim to maximize their profits by supplying the electrical load in a competitive manner. This thesis is devoted to investigate the price based unit commitment problem which is used to optimize generation schedules of these companies in deregulated electricity markets. The solution algorithm developed is based on Dynamic Programming and Lagrange Relaxation methods and solves the optimization problem for a generation company having many generating units with different cost characteristics. Moreover, unit constraints including ramp-rate limits, minimum ON/OFF times, generation capacities of individual units and system constraints such as total energy limits, reserve requirements are taken into account in the problem formulation. The verification of the algorithm has been carried out by comparing the results of some sample cases with those in the literature. The effectiveness of the algorithm has been tested on several test systems. Finally, the possible utilization of the method by a generation company in Turkish Electricity Market to develop bidding strategies is also examined based on some case studies.

The Texas ERCOT market is one of the most open, deregulated electricity markets in the world. This open market brought electricity costs down for Texas residents and businesses, creating a much more competitive economic climate. However, these low prices currently generate insufficient revenue for generators to finance construction of new or replacement generation assets. In the instance of combined cycle advanced natural gas, the Independent Market Monitor 2012 annual report estimated that a plant needed to generate 2.5 times as much as revenue it did in 2012 to incent new generation. This author argues that while the gap is still significant, the continuous changes to the ERCOT market since its inception make an historical examination like that used by the IMM less accurate. New market rules such as price caps or changes in fuel markets through new technologies like hydraulic fracturing create a very different valuation gap than a model based on historical activity alone. This analysis attempts to get a more accurate approximation of the gap through the use of publicly traded futures contracts for natural gas and electricity. Electricity futures reflect market expectations of revenue based on current and future market rules. Gas futures reflect price expectations in light of market changes like fracturing, potential LNG exports, and other changes. Financial positions can be maintained in both markets to give a fixed rate of return. Using this method, one can create a very conservative valuation model that still more accurately reflects market sentiment. This thesis starts with a brief history of ERCOT deregulation from the early 2000s to present in order to clarify for the reader the changes that have taken place in the market. It then demonstrates the futures-valuation model using an advanced combined cycle power plant as an example. / text

Bakgrund: I en konkurrenskraftig miljö med föränderliga villkor krävs en tillämpning av sofistikerade styrverktyg inom ett företags ekonomistyrsystem. Verksamheten PostNord AB har i och med en bolagisering och avreglering genomgått en strukturomvandling men har fortfarande ett statligt uppdrag samtidigt som de konkurrerar med helt kommersiella företag. Problemdiskussion: PostNord AB får i dagsläget inte önskad effekt på styrning i verksamheten då det brister i förhållning till budgeten. Detta har utmynnat i en diskussion kring relationen mellan budget och prestationsmätning och dess styreffekter i organisationen. Syfte: Studiens syfte är att kartlägga PostNord ABs ekonomistyrsystem med särskilt fokus på budget och prestationsmätningar och dess styreffekter i organisationen. Vidare är syftet att ge rekommendationer på förändringar av dagens styrsystem, vilka kan ge en förbättrad styreffekt inom PostNord AB - Region Växjö. Metod: Studien innefattar en fallstudie som forskningsdesign. Insamlingen av empiriskt material har skett genom intervjuer, dokument och observationer. Intervjuerna har utförts semi-strukturerat och respondenturvalet har skett utifrån ett kedje- samt lämplighetsurval. Resultat: Problemområden beträffande ekonomistyrsystemets styreffekter har identifierats där förbättringsförslag rörarande företagets mest kritiska områden har rekommenderats. Dessa innefattar en nedtoning av budgeten till förmån för prestationsmätningar, mål kopplade till mått, ökad kommunikation mellan nivåerna samt förhöjd motivation genom ökat deltagande. Slutsats: Marknaden som PostNord AB verkar på kännetecknas av tämligen fasta spelregler med en likartad infrastruktur för distribution. Avgörandet för företagets framgång beror på hur det på mest fördelaktiga sätt kan anpassa och maximera sin verksamhet efter rådande villkor. Detta talar för en ökad användning av processinriktade prestationsmätningar. / Background: In a competitive environment with changing conditions the use of sophisticated management tool are required within a company’s management control system. The company Post Nord AB has, with corporatisation and deregulation undergone a structural change, but still has a state-mandated while competing with fully commercial enterprises. Problems Discussion: Post Nord AB is in the current situation not receiving the desired effect on the control of the business when because of imperfections in the attitude to the budget. This has led to a discussion on the relationship between budget and performance measurement and its control effects in the organization. Purpose: The aim of the study is to map Post Nord AB’s management control system with particular focus on the budget and performance measurements and its control effects in the organization. A further purpose is to provide recommendations on changes to the current control system, which can enhance the control effect in Post Nord AB - Region Växjö. Method: The study includes a case study research design. The collection of empirical data were collected through interviews, documents and observations. The interviews were conducted semi- structured and the selection were based on a chain and suitability selection. Results: Issues concerning control effects of the management control system have been identified and improvement proposals have been recommended. These include a dimming of the budget in favor of performance measurements, goals related to measurement, increased communication between levels and enhanced motivation through increased participation. Conclusion: PostNord AB acts on a market characterized by fairly fixed rules with a similar distribution infrastructure. The essential for the company’s success depends on how it in most beneficial ways can customize and maximize their business to the prevailing conditions. This suggests an increased use of process-oriented performance measurements.