Transition énergétique | EPFL Graph Search

La transition énergétique désigne à la fois l'évolution passée de la répartition des énergies consommées sur la planète (bois, hydroélectricité, charbon, pétrole, gaz naturel, nucléaire, etc.) et, pour l'avenir, l'objectif politique et technique d'une modification structurelle profonde des modes de production et de consommation de l'énergie. C'est l'un des volets de la transition écologique. La possibilité de changer le niveau de consommation d'énergies et sa répartition entre différents modes résulte des évolutions techniques, des prix et de la disponibilité des ressources énergétiques, mais aussi d'une volonté des populations, des gouvernements, des entreprises qui souhaitent réduire les effets négatifs de ce secteur sur l'environnement. Diverses institutions scientifiques, gouvernementales et ONG ont proposé des définitions et scénarios de transition énergétique. Les scénarios envisagés consistent souvent à passer du système énergétique actuel, reposant sur l'utilisation de ressou

Potential and uncertainty of wind energy in the Swiss Alps

Albertus Christiaan Kruyt

Switzerland has committed itself to an ambitious energy strategy. It aims to replace the exist- ing nuclear generation capacity with predominantly indigenous renewable resources. Wind power could play a significant role in this transition, yet the wind resource in the mountainous terrain that makes up most of the country is poorly understood. There are indications that this resource could be significant, but studies undertaken so far acknowledge large uncertain- ties. This is because the complex topography of the mountains influences the flow patterns significantly, and these can become partially decoupled from the synoptic flow aloft. This thesis aims to improve the understanding of the wind resource in highly complex terrain, and thereby contribute to a well informed energy transition in Switzerland. We start out by investigating the characteristics of the Swiss wind resource based on data from two meteorological measurement networks. From the pair-wise correlation between stations, it is concluded that wind farms across the country can be combined to produce a stable power output. It is also shown that elevation plays an important role in the wind resource, with the likelihood of sustained low wind speeds decreasing as a function of elevation, while mean speeds tend to increase with elevation. Next, a state of the art Numerical Weather Prediction model is assessed in its ability to simulate wind speeds over the Alps, and is shown to improve drastically upon existing mean wind speed estimates. This same model is then used to calculate the wind turbine capacity that is required to produce significant amounts of wind power, and it is found that the required capacity can be significantly reduced by allowing for wind turbines to be built at high elevations. In the last part of this thesis, smaller areas of the Alpine domain are simulated at high resolu- tions, to investigate the effect of increased model resolution on the accuracy and height of resource assessments. While it is found that optimal model parameterization is dependent on weather and terrain, strong indications of higher wind power potential are found with high resolution models compared to a model at lower resolution. This is explained by the fact that high resolutions are required to properly resolve the complex topography, which has a significant influence on the flow patterns and therefore, on the potential energy production.

EPFL2019

Socio-technical modeling of smart energy systems: a co-simulation design for domestic energy demand

Matteo Barsanti, Claudia Rebeca Binder Signer, Lionel Guy Gérard Constantin, Pranay Kasturi

To tackle the climate crisis, the European energy strategy relies on consumers taking ownership of the energy transition, accelerating decarbonisation through investments in low-carbon technologies and ensuring system stability and reliability by actively participating in the market. Therefore, tools are needed to better understand an increasingly complex and actor-dense energy system, tracking socio-technical dynamics that occur at its margins and then predicting the effects on larger scales. Yet, existing domestic energy demand models are not flexible enough to incorporate a wide range of socio-technical factors, and to be incorporated into larger energy system simulation environments. Here, a co-simulation design for domestic energy demand modeling is presented and motivated on the basis of four design principles: granularity, scalability, modularity and transparency. Microsimulation of domestic energy demand, through the Python open source library demod, shows that it is possible to achieve high detail and high temporal resolution without compromising scalability. Furthermore, mosaik, an open source co-simulation framework, makes it possible to generate, integrate and orchestrate a multitude of demod-based instances with other independent models, which for the illustrative purposes of this study are represented by a heat pump model. The authors hope that the detailed documentation of the proposed solution will encourage interdisciplinary and collaborative efforts to develop a simulation ecosystem capable of investigating alternative energy transition pathways and evaluating policy interventions through the socio-technical lens.

Springer2021

Torn between international competition and municipal claims: Analysing key influence factors on municipal utilities’ business strategies in the German and Swiss energy transition

Susan Marie Mühlemeier

After the nuclear accident in Fukushima, amongst others Germany and Switzerland decided to accelerate the sustainability transition of their energy systems not only by expanding the share of renewables actively but also by quitting nuclear power. Regarding this political level of ambition, energy companies´ strategies play a decisive role in terms of the implementation, progress and success of the energy supply system’s transition. So far scholars in sustainability transition research working on the role of energy companies for the transition process, mainly focused on two actor types: firstly, big energy utilities, the incumbents which often hinder the transition and secondly, the new entrants, small innovative businesses challenging the incumbents with new technologies or business models. However, hardly any scholarly work studies another important actor group, which lies in between: the municipal utilities (“Stadtwerke”). In Germany and Switzerland, big municipal utilities are part of the ten most powerful energy providers and in Germany they are even seen as the fifth big power besides the “big four”. Hence, the municipal utilities form an important and powerful actor group in terms of the energy transitions’ progress, which need to be studied more in detail. For a better comprehension of this particular actor group, i) we reveal the key influence factors on their business strategies on an economic and socio-political level, ii) analyse how these factors influence different business strategies in particular – on the general firm level and especially in the business area of renewables - and iii) we compare the different socio-political and economic settings in Germany and Switzerland to derive differences and communalities for municipal utilities on a more aggregate level. We employ the triple embeddedness framework (TEF) by Frank Geels, which considers the interaction of firms with their economic and socio-political environment and facilitates an in-depth case study analysis. For empirical evidence, we conduct an explorative case study analysis with four big municipal utilities in Germany and Switzerland in the cities of Munich, Hannover, Geneva and Zurich. This allows not only for an in-depth analysis of the single municipal utilities, its business strategies and local environment but also for an inter-national comparison of different political settings, which are highly important for the municipal utilities. Methodologically, we firstly employ a document analysis on the utilities structural characteristics and business strategies – on the general firm level but also on the specific business area of renewables. Secondly, we conduct explorative expert interviews with researchers and members of associations in the field as well as the CEOs of the four selected utilities to further reveal the specifics of municipal utilities, obtain an improved knowledge on their business strategies and an overview on important influence factors. Thirdly, we conduct semi-structured expert interviews with different members of the four utilities’ strategic management board, the municipal supervisory board and the renewables department in order to validate and discuss the revealed results and analyse the causal interrelations between the influence factors and the utilities’ strategies. These empirical results will be mirrored with findings from scholarly and practical literature. Preliminarily, our studies show that the four chosen cases are the biggest and oldest municipal utilities in each country, established in the end of the 19th century and they are still mainly in the possession of the cities (min. 75%). The legal form of the utilities varies from being a dependent division of the municipal administration, an independent public enterprise, a private company with limited liability or a corporation. Therewith, the influence from the municipal supervisory board and the room for manoeuvre of the firm varies enormously. This is one of the most important influence factors on the municipal utilities’ business strategy and a special feature compared to other actor groups in energy supply. On the other hand, the market liberalisation – which took place in 1998 in Germany and 2009 in Switzerland as partial liberalisation – depict another key influencing factor, since the municipal utilities are forced to compete on the (inter)national market on top of their obligations as a public service provider for their local urban system. Dependent on their binding to the municipality, respectively their form of organisation, the municipal utilities reacted differently to the liberalisation: some invested intensively in renewables all over Europe others strengthened their local energy production, some established strategic allies with other municipal utilities or absorbed other companies. These preliminary results already show, that municipal utilities are complex actors with very specific characteristics embedded in multi-scalar environments full of suspense. With our study, we contribute to a better understanding of this actor type, the important context factors and the utilities’ strategic answers in the context of the energy transition. By revealing the specifics in an international comparison, we enrich not only to the scholarly discussion on key actors in the sustainability transition of urban energy supply systems but also provides decision-makers in policy and economy valuable insights for the future design of sustainable and resilient energy governance systems.

2017