An electricity market is very complex and different in its nature, when compared to other commodity markets. The introduction of competition and restructuring in global electricity markets brought more complexity and major changes in terms of governance, ownership and technical and market operations. In a liberalized electricity market, all market participants are responsible for their own decisions; therefore, all the participants are trying to make profit by participating in electricity trading. There are different types of electricity market, and in this research a bilateral electricity market has been specifically considered. This thesis not only contributes with regard to the reviewing UK electricity market as an example of a bilateral electricity market with more than 97% of long-term bilateral trading, but also proposes a dual aspect point of view with regard to the bilateral electricity market by splitting the generation and supply sides of the wholesale market. This research aims at maximizing the market participants’ profits and finds the equilibrium point of the bilateral market; hence, various methods such as equilibrium models have been reviewed with regard to management of the risks (e.g. technical and financial risks) of participating in the electricity market. This research proposes a novel Conjectural Variation Equilibrium (CVE) model for bilateral electricity markets, to reduce the market participants’ exposure to risks and maximize the profits. Hence, generation companies’ behaviors and strategies in an imperfect bilateral market environment, oligopoly, have been investigated by applying the CVE method. By looking at the bilateral market from an alternative aspect, the supply companies’ behaviors in an oligopsony environment have also been taken into consideration. At the final stage of this research, the ‘matching’ of both quantity and price between oligopolistic and oligopsonistic markets has been obtained through a novel-coordinating algorithm that includes CVE model iterations of both markets. Such matching can be achieved by adopting a hierarchical optimization approach, using the Matlab Patternsearch optimization algorithm, which acts as a virtual broker to find the equilibrium point of both markets. Index Terms-- Bilateral electricity market, Oligopolistic market, Oligopsonistic market, Conjectural Variation Equilibrium method, Patternsearch optimization, Game theory, Hierarchical optimization method

The electricity market in the UK is undergoing dramatic changes and requires a transformation of existing practices to meet the current and forthcoming challenges. One aspect of the solution is the deployment of demand side management (DSM) programmes to influence domestic behaviour patterns for the benefit of the overall network. Effective deployment of DSM requires segmentation of the population into a small number of groupings. Using a database of electricity meter data collected at a frequency of five minutes over a year from several hundred houses, households are clustered based on the shape of the average daily electricity usage profile. A novel method, incorporating evaluation criteria beyond compactness, of evaluating the resulting groupings is defined and tested. The results indicate the potentially most useful algorithms for use with load profile clustering. Patterns within the electricity meter data are approximated and symbolised to allow motifs (representing repeated behaviours) to be identified. Uninteresting motifs are automatically identified and discarded. The different possible parameters, including size of motif and number of symbols used in representing the data, are explored and the most appropriate values found for use with electricity meter data motif detection. The concept of variability of regular behaviour within a household is introduced and methods of representing the variability are considered. The novel method of using variability in timing of motifs is compared to other techniques and the results tested using the previously defined evaluation criteria. Combining the generated motif data with the meter data to produce a single set of archetypes does not produce more useful results for use with DSM. However, creating complementary sets of archetypes based on each set of data, provides a more complete understanding of the households and allows for better targeting of DSM initiatives.

The UK government has committed to challenging climate change and renewable energy obligations to 2020 and beyond. The renewable electricity sector remains a key focus in meeting these targets, given the critical need to decarbonise the power sector in the longer term. This has led to an ambitious renewable electricity sectoral target of 30 percent of total electricity generation from renewable sources (RES-E) by 2020, corresponding to a deployment target of 35-40GW of installed capacity. In 2011, RES-E deployment stood at 12.3GW, resulting in the UK requiring 23-28GW of additional renewable electricity technology (RET) deployment in eight years. This requires a substantial amount of new RET capacity be adopted, the majority anticipated to come from a four large-scale (>5MW) technologies (onshore and offshore wind, biomass conversion and dedicated biomass). However, large-scale renewable deployment has consistently under-performed against previous targets and other policy objectives. There are a number of failures that historically and currently act as constraints to RET deployment. This thesis categories those constraints as either internal or external failures. Internal failures are due to the design of the subsidy mechanism used to promote renewable deployment (type of mechanism, how it operates, revenue risk, investment (lender) risk, subsidy support levels and mechanism complexity). External failures are those constraints out-with the direct control of the mechanism (planning, network, public participation and engagement and policy risk). These constraints need to be addressed. This thesis has carried out an evaluation of the current UK approach to large-scale RET deployment to 2020 and beyond by adopting a systemic framework approach to determine whether or not the UK will be successful in addressing the potential constraints – the internal and external failures – to deployment. The systemic approach is based on three key criteria regarding the potential constraints: a comprehensive set of constraints, analysed in-depth and taking into account the interaction of the constraints in a systemic fashion. In contrast, the government approach to dealing with these potential constraints has typically focused on failures in isolation; also government commissioned modelling and existing research does not take into account all of the internal and external failures and/or examine them in-depth. Critically, no research has analysed the systemic interactions. With this approach, this research aims to fill the gap in extant knowledge and analysis due to the absence of existing research meeting the key criteria. This thesis was carried out by a textual analysis of key policy documents and legislation that form the basis of the UK government’s current approach to addressing the barriers to RET deployment. The method of inquiry utilised here is that of the qualitative research approach. The results show that there are significant systemic interactions between the internal and external failures (internal>internal; external>external; and internal to external and vice versa). There are also a number of feedbacks, specifically between grid>planning and public participation and engagement>planning. This creates systemic imbalances and unresolved tensions between the constraints. Importantly, the systemic interactions impact disproportionately on the key RETs, with a particular emphasis on onshore and offshore wind. By not addressing potential constraints from a systemic perspective, the current UK approach discriminates in favour of a system highly dependent on large-scale developments, of a few select RETs by a limited number of developers of a particular type (typically ex-utility, large-scale). This limits the focus on social and behavioural issues, particularly in terms of participation and engagement in ownership, decision-making and reducing the role of small-scale, independent and community group participation. In conclusion, under the current approach, decisions will be made on a separate ad-hoc basis leading to continual reform and adjustment with less clarity of where the risks lie. Increasing deployment year-by-year will only accumulate and intensify the potential constraints with limited options to address this. Effectively, government can only buy or control its way out of the constraints. In contrast, a systemic approach offers policy makers a way out of this. By providing an overview of the system and identification of systemic interactions in an early and novel way, this approach offers the opportunity for pragmatic decision-making at the systemic level leading to more predictable routes to solving problems via focused reforms, thus mitigating risks to a greater extent and redefining the system in a more optimal and resilient way. In other words, it allows government to connect the dots in addressing potential constraints to deployment.

Στην παρούσα έρευνα εκτιμήθηκε η επίδραση του κατά κεφαλήν εισοδήματος, της τιμής του ηλεκτρισμού και της τιμής του ακατέργαστου πετρελαίου στην ζήτηση ηλεκτρικού ρεύματος στην Ελλάδα και συγκεκριμένα στον τομέα των νοικοκυριών. Τα δεδομένα που εισήχθησαν στο οικονομετρικό μοντέλο αφορούσαν την περίοδο 1981 έως 2010. Για την εκτίμηση των βραχυχρόνιων και μακροχρόνιων επιδράσεων των ανεξάρτητων μεταβλητών επί της εξαρτημένης εφαρμόστηκαν δύο μέθοδοι, η Engle Granger two step method και η ARDL . Τα αποτελέσματα που προέκυψαν από την έρευνα έδειξαν ότι οι μακροχρόνιες επιδράσεις όλων των ανεξάρτητων μεταβλητών βρέθηκαν στατιστικά σημαντικές στο επίπεδο σημαντικότητας 0.05. Συγκεκριμένα η επίδραση του εισοδήματος βρέθηκε θετική ενώ των τιμών ηλεκτρισμού και πετρελαίου αρνητικές. Βραχυχρόνια βρέθηκε ότι στη ζήτηση του ηλεκτρισμού επιδρά σημαντικά η τιμή του πετρελαίου σύμφωνα και με τις δύο μεθόδους και το κεφαλήν εισόδημα σύμφωνα μόνο με την μέθοδο Engle Granger. Τέλος οι μακροχρόνιες ελαστικότητες βρέθηκαν μεγαλύτερες από τις αντίστοιχες βραχυχρόνιες. / The present study estimates the effect of GDP per capita, electricity price and oil price on the residential electricity demand in Greece. The annual data that has been used in the econometric model is from the period 1981 to 2010. Two techniques have been used for the estimation of the long run and short run effects of the independent variables on the dependent, Engle Granger two step method and ARDL method. The results that have been found from the study show that long run effects of all independent variables are statistically significant at the 0.05 significant level. The effect of electricity price and oil price has been found negative and the effect of GDP per capita has been found positive. More specifically, in the short run period only oil price elasticity has been found statistically significant according to the two methods and income elasticity has been found statistically significant only according to Error Correction Model. In addition long run elasticities have been found to be larger than the short run elasticities.

The threat of climate change has led to many countries and regions adopting renewable targets. Scotland's is one of the most ambitious, with an aim to generate the equivalent to 100% of its electricity needs from renewable sources by 2020. Scotland has a very large renewable resource, primarily consisting of offshore and onshore wind, tidal stream, wave and hydro power; all of which are characterised by having variable output. Over a long period, such as a year, variability in renewable generation will average out and may meet or exceed total annual demand. This thesis investigates whether matching of demand and generation is possible within a timescale meaningful to electricity system users; that is whether renewable generation can meet electricity demand in any given hour. This was established by using historic data to create an hourly generation hindcast of Scotland's renewable generation over a 30 year climate “normal” period. These outputs are then compared to a hindcast of hourly demand based on observations over the most recent few years. The results demonstrated that it is possible for Scotland to rely entirely upon renewable generation to fulfil demand in any hour of the 30 year hindcast. However, it appears that the renewable capacity and storage currently built or within the Scottish planning system is only sufficient to match demand in 65% of the hours within the hindcast. The hindcast allows judgements to be made as to how 100% of demand could be met most effectively and provides the basis of a coherent planning strategy, with security of supply at its centre. Further wave and tidal stream capacity is shown to be of higher value than additional wind power but in the latter case, addressing the geographical diversity of wind power can enable maximise phasing between sites to increase the security of supply. Importantly this work provides a means of informing decision making about where best to develop wind, wave and tidal resources and what additional storage may be required in order to provide 100% security of supply. The results are also of particular importance to Scotland's renewable generation strategy in the case of assessing where new on- and off-shore wind farms should be developed, as wind is set to dominate Scotland's renewable portfolio for the foreseeable future.

This research considers the motivating factors behind energy use in the residential sector, which in 2011 accounted for more than 26% of overall energy use in the UK. The study took a mixed method approach and considered case studies in both the UK and Australia, two countries with very different energy regimes. UK case studies were analysed using predictive energy modelling, quantitative assessment of actual energy use and thermal comfort, and qualitative interview and focus group assessment of individual motivation around energy use. The Australian case studies were assessed qualitatively and their attitudes compared to the UK core group. Additional perspectives were gained through interviews with UK landlords, a large environmental group, a senior politician, and two senior policymakers from a large energy company. The investigation assesses the implied importance of the key strands developed from previous research in instigating changes in behaviour amongst occupants. These include psychological, social, financial, educational and regulatory factors. In particular, it looks at the ineffectiveness of the Green Deal on energy behaviour in the residential sector. The research offers a reasoned explanation as to why it is important to record predictive, actual, and intended behaviour with regard to energy use. The study concludes that a variety of incentives are necessary to encourage behaviour change, and that the complexity of occupant behaviour makes it difficult to develop a single policy to encourage more sustainable energy use. There is sometimes a disconnect between intention and behaviour. However, there seems to be a certain commonality among the occupants, in that their behaviour around energy is often other than predicted by conventional economics and more likely to incorporate predictions from behavioural economics. This is recognised by the case study participants in both the UK and Australia, and they largely agree on the beneficial role of government in regulating them and "nudging" them in the right direction with regard to influencing their motivations around energy use. Financial incentives are also a key driver in motivating residents to use energy more sustainably, but they need to be carefully aligned to suit a wide range of individuals. Another issue that became clear in the research is that policy focusing purely on energy efficiency can be ineffective, if the policy goal is to mitigate the effects of climate change. The rebound effect is likely to result in a lower demand for residential energy transferring to increased demand for energy elsewhere in the economy. The study recommends that policy should focus on sustainable energy use, using financial and other mechanisms to discourage the use of fossil fuels.

Drastic changes have taken place in UK electricity policy over recent years as government has sought to address the challenges associated with energy security, affordability and commitments to reduce carbon emissions. This study investigates the underlying policy changes between the year 2000 and 2012, particularly the Electricity Market Reform, as the most fundamental transformation in the British power market since liberalisation, almost three decades ago. It illustrates that although this policy had revised the long legacy of market-based and technology neutral electricity policymaking, it was yet to be claimed as a wholesale paradigmatic shift, because, as of 2012, it still suffered from a form of paradigm ambivalence and socio-technical lock-in. Furthermore, this research identifies an accumulative process of policy change explaining how a complex set of dynamics transformed the UK electricity policy mix. The thesis relies empirically on conducting 53 semi-structured interviews as well as scrutinising policy documents and relevant secondary studies. The thesis draws relevant approaches within policy studies that attend to address continuity and change in policy frameworks, in particular the Advocacy Coalition Framework (Sabatier 1999) and Policy Paradigm (Hall 1993) perspectives. The study contributes to this literature in three distinctive ways. First, it questions the adequacy of existing frameworks for conceptualising policy change in ‘large-technical’ and ‘techno-centric’ subsystems, such as electricity policy. In return, it introduces technology preference, as a policy component capturing the socio-technical elements of electricity policymaking. Second, to explain why and how such significant changes had been undergone, it forms a bridge between the characteristics of policy change and the extent that existing policies are perceived as irreconcilable policy failures. By this, it, albeit, moves beyond the conventional typology of change drivers in policy literature. Third, this research extends the emerging concept of negotiated agreement and policy compromise as a pathway to evolutionary changes (Sabatier & Weible 2007). Inspired by Institutional Change theory (Mahoney & Thelen 2010), it proposes that compromised policies are often at the risk of policy reversibility and retrenchment, subject to any shift in the contextual conditions they have originated in. Overall, the thesis provides an understanding of one of the very complex and contemporary cases for studying policy change theories.

Η παρούσα διπλωματική εργασία εκπονήθηκε με σκοπό την δημιουργία ενός μοντέλου του Εθνικού Διασυνδεδεμένου Συστήματος Μεταφοράς για το έτος 2015, στο οποίο θα συμπεριλαμβάνονται όλες οι μονάδες Ανανεώσιμων Πηγών Ενέργειας που γνωρίζομε ή υποθέτουμε ότι θα ενταχθούν στο Σύστημα μέχρι το 2015. Οι υποθέσεις αυτές έγιναν σύμφωνα με τα στοιχεία της ΜΑΣΜ 2010-2014 (όπου αναφέρονται αναλυτικά οι μονάδες παραγωγής ενέργειας συμβατικές και μη, που θα συνδεθούν ή θα αποσυρθούν από το Σύστημα), τις προβλέψεις του Εθνικού Σχεδίου Δράσης για τις ΑΠΕ (ΕΣΔ/ΑΠΕ), την σχετική μελέτη που πραγματοποιήθηκε στο Κέντρο Ανανεώσιμων Πηγών Ενέργειας (ΚΑΠΕ), καθώς από την Ρυθμιστική Αρχή Ενέργειας (ΡΑΕ) από την οποία γνωρίζουμε ποιες μονάδες βρίσκονται στο στάδιο της αδειοδοτικής διαδικασίας και επομένως η ένταξή τους στο Σύστημα είναι πολύ πιθανό να πραγματοποιηθεί στα προσεχή έτη. Η επιλογή του έτους 2015 για την μελέτη έγινε επειδή τα διαθέσιμα μέχρι σήμερα στοιχεία επιτρέπουν πιο ασφαλείς προβλέψεις για την διαμόρφωση του ηλεκτρικού Συστήματος Μεταφοράς. Παρόλο που ο τελικός στόχος από την Ευρωπαϊκή Ένωση τέθηκε για το 2020, μια απευθείας μελέτη διαμόρφωσης του Συστήματος για τότε θα ήταν επισφαλής, καθώς, όπως προαναφέρθηκε, δεν υπάρχει η απαιτούμενη πληροφορία. Άλλωστε το 2015 θα μπορούσε να θεωρηθεί ένας βασικός σταθμός καθώς θα αποτελέσει την βάση για την επίτευξη του στόχου που έχει τεθεί για το 2020. Πιο αναλυτικά η διπλωματική αυτή εργασία χωρίζεται στις παρακάτω ενότητες: ΚΕΦΑΛΑΙΟ 1Ο: ΘΕΩΡΙΑ ΣΥΣΤΗΜΑΤΩΝ ΗΛΕΚΤΡΙΚΗΣ ΕΝΕΡΓΕΙΑΣ Στο κεφάλαιο αυτό στην πρώτη ενότητα αρχικά γίνεται αναφορά στην Ανάλυση Ροής Φορτίου και στο πόσο σημαντικό ρόλο έχει η ανάλυση αυτή για την σωστή σχεδίαση και λειτουργία του ηλεκτρικού Συστήματος. Στη συνέχεια γίνεται η μαθηματική περιγραφή του προβλήματος της ανάλυσης ροής φορτίου καθώς και μια εκτενής αναφορά για τις παραδοχές και τις προϋποθέσεις που πρέπει να τηρηθούν ώστε τελικά να δουλέψει σωστά το Σύστημα ηλεκτρικής ενέργειας που πρόκειται να σχεδιαστεί. Τέλος γίνεται μια μικρή αναφορά στις αριθμητικές μεθόδους που θα χρησιμοποιηθούν ώστε να πραγματοποιηθεί η επίλυση των εξισώσεων που προέκυψαν από την ανάλυση ροής φορτίου. Στην επόμενη ενότητα του ίδιου κεφαλαίου παρουσιάζονται τα στοιχεία του Συστήματος (π.χ. ζυγοί, κυκλώματα, μηχανές, φορτία κλπ.) που περιλαμβάνονται στην βάση δεδομένων του υπολογιστικού προγράμματος που θα χρησιμοποιηθεί για την επίλυση των εξισώσεων της ανάλυσης ροής φορτίου. Στην τελευταία ενότητα αυτού του κεφαλαίου γίνεται μια μικρή παρουσίαση του προγράμματος PSS/E, που είναι και το υπολογιστικό πρόγραμμα που χρησιμοποιήθηκε στην παρούσα εργασία για την επίλυση του Συστήματος. ΚΕΦΑΛΑΙΟ 2Ο: ΕΘΝΙΚΟ ΣΧΕΔΙΟ ΔΡΑΣΗΣ ΓΙΑ ΤΙΣ ΑΠΕ ΚΑΙ ΟΙ ΣΤΟΧΟΙ ΜΕΧΡΙ ΤΟ 2020 Στην πρώτη ενότητα αυτού του κεφαλαίου παρουσιάζεται ποιο είναι το σχέδιο δράσης για τις ΑΠΕ που αφορά την χώρα μας. Στην επόμενη ενότητα αυτού του κεφαλαίου, γίνεται μια αναφορά στις προϋποθέσεις ώστε να επιτευχθούν οι στόχοι που θέτει το εθνικό σχέδιο δράσης για τις ΑΠΕ. Τέλος στην τρίτη ενότητα παρουσιάζονται αναλυτικά οι στόχοι διείσδυσης των ΑΠΕ από το 2010 έως το 2020. ΚΕΦΑΛΑΙΟ 3Ο: ΕΛΛΗΝΙΚΟ ΔΙΑΣΥΝΔΕΔΕΜΕΝΟ ΣΥΣΤΗΜΑ ΜΕΤΑΦΟΡΑΣ Στην πρώτη ενότητα του κεφαλαίου γίνεται μια αναλυτική περιγραφή του υφιστάμενου Συστήματος Μεταφοράς της χώρας. Στην δεύτερη ενότητα γίνεται αναφορά στην δυνατότητα του ηλεκτρικού δικτύου της χώρας να απορροφήσει την παραγωγή των σταθμών ΑΠΕ που πρόκειται να συνδεθούν σε αυτό. Επιπλέον γίνεται αναφορά στην διαδικασία αδειοδότησης και καθώς και στις υπόλοιπες προϋποθέσεις για την διείσδυση των ΑΠΕ στο Σύστημα. Τέλος στην τρίτη ενότητα γίνεται εφαρμογή του σχεδίου δράσης για τις ΑΠΕ στο έτος 2015, που αποτελεί και το έτος μελέτης της παρούσας εργασίας. ΚΕΦΑΛΑΙΟ 4Ο: ΔΙΑΜΟΡΦΩΣΗ ΤΟΥ ΕΛΛΗΝΙΚΟΥ ΔΙΑΣΥΝΔΕΔΕΜΕΝΟΥ ΣΥΣΤΗΜΑΤΟΣ ΜΕΤΑΦΟΡΑΣ ΗΛΕΚΤΡΙΚΗΣ ΕΝΕΡΓΕΙΑΣ ΓΙΑ ΤΟ 2015 Αρχικά στην πρώτη ενότητα παρουσιάζεται η κατανομή φορτίου στους υποσταθμούς του Συστήματος για το 2015. Στη συνέχεια (δεύτερη ενότητα), γίνεται λεπτομερής περιγραφή του Εθνικού Διασυνδεδεμένου Συστήματος Μεταφοράς (ΕΔΣΜ), όπως διαμορφώθηκε για το έτος μελέτης της εργασίας. Τέλος στην τρίτη ενότητα, φαίνεται η μελέτη του μοντέλου του Συστήματος, όπως διαμορφώθηκε για το έτος 2015, για τρία διαφορετικά ακραία σενάρια λειτουργίας. ΚΕΦΑΛΑΙΟ 5Ο: ΣΥΜΠΕΡΑΣΜΑΤΑ ΚΑΙ ΠΡΟΟΠΤΙΚΕΣ Στην πρώτη ενότητα αυτού του κεφαλαίου αναφέρονται τα γενικά συμπεράσματα που προέκυψαν από την προηγηθείσα μελέτη. Στην επόμενη ενότητα, γίνεται αναλυτική παρουσίαση των αποτελεσμάτων στης ανάλυσης ροής φορτίου για κάθε ένα από τα τρία σενάρια που μελετήθηκαν. Ενώ στην τελευταία ενότητα, γίνεται αναφορά στις προοπτικές ανάπτυξης και διαμόρφωσης του Συστήματος για το 2020, βασιζόμενοι στα αποτελέσματα που προέκυψαν από την διαμόρφωση του δικτύου για το 2015. / This thesis, entitled "Study for the development of an electric energy transmission network which incorporates Renewable Energy Sources", was conducted in order to create a model of the National Interconnected Electric Energy Transmission System, which will include all the renewable energy system units that are already known or assumed to join the system by 2015. These assumptions were made according to the data provided by the TSDS 2010-2014 (offering a detailed plan of the all the power plant units, conventional or not, which will be connected to or removed from the system), the provisions of the National Action Plan for Renewable Energy Sources (EA / RES) , the related study conducted at the Centre for Renewable Energy Sources (CRES), and the data of the Regulatory Authority for Energy (RAE), which indicated the units that are under the licensing process and therefore they are likely to be connected to the system in the years to come. Choosing the year 2015 for the study is based on the fact that the available data nowadays allows for more accurate predictions about the configuration of the electric transmission system in two years period. Although the European Union set the ultimate goal for 2020, a direct study of the system configuration at that time would be risky, since, as mentioned above, the required information is not available. Besides that, the year 2015 could be considered a basic year as it will form the basis for achieving the target set for 2020. This thesis is divided into the following sections: CHAPTER 1: SYSTEMS THEORY OF ELECTRICITY In this chapter the first section refers to Load Flow Analysis and how important this analysis is for the proper design and operation of electrical systems. Afterwards, a mathematical description of the problem of load flow analysis is presented along with a comprehensive analysis of all the assumptions and conditions that must be met, in order to guarantee that power system to be designed will finally work properly. The numerical methods used to solve the equations resulting from the load flow analysis are described briefly. The second section of this chapter contains the system components (eg. scales, circuits, machines, loads, etc.) that are included in the database of the computer program which will be used to solve the equations of the load flow analysis. The last section of this chapter is a short presentation of the PSS / E program, which is the computer program used in this thesis in order to solve the problems stated. CHAPTER 2:NATIONAL ACTION PLAN FOR RES AND GOALS SET BY 2020The first section of this chapter is a thorough description of the action plan for Renewable Energy Sources in our country. The next section of this chapter refers to the conditions that should be met in order to achieve the targets set by the National Action Plan for RES. Finally, in the third section the objectives of the adoption of the RES from 2010 to 2020 are discussed. CHAPTER 3: GREEK INTERCONNECTED TRANSFER SYSTEM The first section of this chapter is a detailed description of the existing electric energy transportation system of our country. In the second part we examine the ability of the existing electric energy network to absorb the production of the RES plants that will be to be connected to it. Furthermore, a presentation of the licensing process and all the other requirements for the adoption of RES in the existing system is provided. In the third section the implementation of the Action Plan for RES in 2015, which is the year that we examine in this thesis, is attempted. CHAPTER 4: DEVELOPMENT OF THE GREEK INTERCONNECTED ELECTRIC ENERGY TRANSFER SYSTEM FOR 2015 Initially how the load will be distributed to the system’s substation in 2015 is described in the first section. The second section is a detailed description of the National Interconnected Transmission System (EDSM) which was designed in this thesis for 2015. Finally, assuming three different extreme scenarios for the system operation an analysis of the designed model for the system, as described in the second section, is presented. CHAPTER 5: CONCLUSIONS AND PROSPECTS The first section of this chapter summarizes all the general conclusions drawn from the study conducted in this thesis. In the next section, there is a detailed presentation of the results extracted by the load flow analysis conducted for each of the three scenarios examined in the third section of Chapter 4. The last section discusses prospects for the growth and the development of the system for 2020, based on the results extracted from the network configuration that was done for 2015.This thesis was conducted by the student of Electical and Computer Engineering Department, University of Patras, Melaniti Maria-Anthia with the help of Dr. Sakellaridis Nicholas employee to CRES.

By August 2016, 180 countries have signed the Paris Agreement and committed to holding the increase in the global average temperature to well below 2degC above pre-industrial levels. Abiding by the agreement will require a substantial reduction of emissions over the next few decades and near zero emissions of CO2 and other long-lived greenhouse gases by the end of this century. In this context, the decarbonisation of the global power sector is of strategic importance, because low-carbon electricity has system-wide benefits that go beyond the electricity sector, enabling significant reductions of CO2 emissions in the industry, transport and buildings sectors. To make the necessary changes depends partly on improving the analysis and estimates of the economics of climate change, and for that there is an urgent need for a new generation of models that give a more accurate picture of the potential decarbonisation pathways. The technological transition towards a low carbon power sector depends on many uncertain factors, such as policy efficiency, renewable energy investment and availability of energy resources. The knowledge about how these uncertain factors interact, and the impacts on the technological evolution of the energy sector, are the key to creating successful policies for driving the economy towards a cleaner, low carbon society. In this context, the work presented here provides decarbonisation scenarios of the global power sector, under uncertain drivers of technological change, and in doing so, enables a better understanding of technology diffusion process in the power sector. The scenarios are created using the FTT:Power model, a representation of global power systems based on market competition, induced technological change and natural resource use and depletion. The scenarios analysed in this dissertation are focused on four drivers of technological change: energy policy, energy resource availability, learning and investment. The influence of uncertainty on each of these drivers is analysed in detail, through endogenous emission scenarios of the global power sector between 2016 and 2050. Emission pathways with uncertainty ranges, as well as policy recommendations, are presented as a result of the modelling exercise.

Since the early 1990s electricity reforms across Sub-Saharan Africa have been marked by controversy. Despite the World Bank's major role in driving electricity reform as part of its conditional lending strategy in the electricity sector, its relationship with recipient countries has received little attention within the electricity reform literature. This is surprising given the increasing pressure on the World Bank to improve the effectiveness of its conditional lending more generally. This thesis contributes to filling this gap by exploring how World Bank-recipient country relations shape and constrain the direction of reform. The donor-recipient relationship is commonly espoused in the academic literature as a principal-agent relationship, whereby international aid organisations (principals) delegate authority for implementing their development policies to recipient countries (agents). I develop this framework by incorporating refined concepts of power, partnership, ownership and knowledge, prominent features in development studies literature and recent donor discourse. The analytical framework developed is applied to the process of electricity reform in two countries: Tanzania and Ghana. While the impetus for reform in these two countries was similar, the way in which the reform process unfolded was different. The analysis is based on in-depth, semi-structured interviews and documentary evidence. It uses a process-tracing method, combining within-case and cross-case analysis. A number of insights emerge from the analysis. I find that availability of reform expertise plays a significant role in determining the strength of power relations between donors and recipient countries. It also appears that reform ownership lies within different ‘domains'. Uneven ownership across domains accounts for the inconsistent reform implementation noted in both cases. And knowledge asymmetry provides a useful concept to analyse the impact of decentralised donor staff. In conclusion, this thesis argues that a modified principal-agent framework offers additional insight into the workings of the donor-recipient relationship.