Publications by Annelen Kahl | EPFL Graph Search

Optimized market value of alpine solar photovoltaic installations

Annelen Kahl, Jérôme François Sylvain Dujardin

Solar photovoltaic (PV) is the most rapidly expanding renewable resource worldwide. Yet, its full potential may be hindered by mismatches with market demand and correlated production profiles. In this research, we explore a case study of innovative PV plac ...

Pergamon-Elsevier Science Ltd2022

Sources of Primary Electricity Supply

Michael Lehning, Aleksandra Kim, Annelen Kahl

This synthesis report provides an overview of primary electricity supply sources, including power generation potentials and costs as well as the as- sociated environmental burdens of electricity pro- duction in Switzerland. It gives a synthesis of the main ...

ETH Zurich2022

SWEET-EDGE: Enabling Decentralized renewable Generation in the Alps

Michael Lehning, Annelen Kahl, Jérôme François Sylvain Dujardin

The overall EDGE objective is to fast-track the growth of locally-sourced decentralized renewable energy in Switzerland and to ensure that by 2035 and 2050, when ambitious shares of renewable energy are reached, the Swiss energy system is designed and oper ...

2022

How Forward-Scattering Snow and Terrain Change the Alpine Radiation Balance With Application to Solar Panels

Michael Lehning, Annelen Kahl

Rough terrain in mid- and high latitudes is often covered with highly reflective snow, giving rise to a very complex transfer of incident sunlight. In order to simplify the radiative transfer in weather and climate models, snow is generally treated as an i ...

2021

Synergistic optimization of renewable energy installations through evolution strategy

Michael Lehning, Annelen Kahl, Jérôme François Sylvain Dujardin

With large parts of the world moving toward renewable energies, there is an urgent need to organize this large-scale transition effectively. This paper presents a new methodology to guide the planning and siting of renewable electricity generation for coun ...

2021

Floating PV in mountain artificial lakes: a checklist for site assessment

Annelen Kahl

Floating photovoltaics is a emerging approach to deploy photovoltaics on water bodies. Thanks to its high overall global potential and the extensive experience gained (with more than 2 GWp installed and than 510 plants, up to 2020), it represents a promisi ...

2021

Reich Ernte vom Gipfel

Annelen Kahl

2019

The bright side of PV production in snow-covered mountains

Michael Lehning, Annelen Kahl, Jérôme François Sylvain Dujardin

Our work explores the prospect of bringing the temporal production profile of solar photovoltaics (PV) into better correlation with typical electricity consumption patterns in the midlatitudes. To do so, we quantify the potential of three choices for PV in ...

National Academy of Sciences2019

Charting the course: A possible route to a fully renewable Swiss power system

Pedro Filipe De Almeida Manso, Michael Lehning, Albertus Christiaan Kruyt, Stuart John Bartlett, Annelen Kahl, Jérôme François Sylvain Dujardin

The prospect of a renewable transition seems plausible for many countries, but can be shrouded in risks, costs and challenges. This paper illuminates a path for such a transition with a numerical investigation, aimed at resolving the power dynamics of a co ...

2018

Dataset on PV Production in Snow Covered Mountains

Michael Lehning, Annelen Kahl, Jérôme François Sylvain Dujardin

The SUNWELL Modelling Environment is a combination of data and code that models electricity production from satellite-derived irradiance data and other spatial data sets for all of Switzerland. This ensemble accompanies the publication "The bright side of ...

2018

31 years of hourly spatially distributed air temperature, humidity, and precipitation amount and phase from Reynolds Critical Zone Observatory

Annelen Kahl

Copernicus GmbH2018

Potential contributions of wind power to a stable and highly renewable Swiss power supply

Michael Lehning, Albertus Christiaan Kruyt, Annelen Kahl

Using data from two measurement networks, we analyse the following aspects of wind speeds over Switzerland to assess the possibility of high wind power penetration: spatial correlation, persistent low wind power conditions and the diurnal and seasonal wind ...

Elsevier Sci Ltd2017

Interplay between photovoltaic, wind energy and storage hydropower in a fully renewable Switzerland

Michael Lehning, Albertus Christiaan Kruyt, Stuart John Bartlett, Annelen Kahl, Jérôme François Sylvain Dujardin

As part of its ambitious long term energy strategy, Switzerland plans to phase out nuclear power production and replace most or all of its significant share of national electricity production (40%) by renewables, in particular by photovoltaics (PV) and win ...

Pergamon-Elsevier Science Ltd2017

Spatial estimates of snow water equivalent from reconstruction

Annelen Kahl

Operational ground-based measurements of snow water equivalent (SWE) do not adequately explain spatial variability in mountainous terrain. To address this problem, we combine satellite-based retrievals of fractional snow cover for the period 2000 to 2011 w ...

Elsevier2016

Reliable Averages and Risky Extremes – Analysis of spatiotemporal variability in solar irradiance and persistent cloud cover patterns over Switzerland

Michael Lehning, Juliette Ferial Blanchet, Albertus Christiaan Kruyt, Annelen Kahl

With the perspective of Switzerland’s phase-out from nuclear energy, solar energy potential may take an important role for the country’s future in renewable energy. Based on 12 years of satellite-derived, spatially distributed data of daily average cloud f ...

Elsevier2016

Large Scale Deployment of PV Units in Existing Distribution Networks: Optimization of the Installation Layout

Mario Paolone, Michael Lehning, Jana Darulová, Fabrizio Sossan, Stuart John Bartlett, Annelen Kahl

In fixed PV installations, the azimuth and tilt of the panels are normally chosen with the objective of maximizing the plant capacity factor. In this paper, we show that when considering distribution networks with densely clustered PV plants, there exist i ...

Università degli Studi di Genova, Italy2016

Risks and Reliability in a Fully Renewable Switzerland

Michael Lehning, Albertus Christiaan Kruyt, Stuart John Bartlett, Annelen Kahl

In Switzerland, the government has made ambitious plans for a major energy transition. There is a planned phase out of nuclear facilities by mid-century, their capacity replaced by an expansion of hydroelectric infrastructure, new geothermal installations, ...

2015