Lebenslauf:

seit 01/2025 Universität Duisburg-Essen
Wissenschaftliche Mitarbeiterin am Lehrstuhl für Energiewirtschaft
Postdoktorandin

02/2019 - 12/2024 Universität Duisburg-Essen
Doktorandin im Forschungskolleg “Nachhaltige Energiesysteme im Quartier”
Abschluss: Promotion

10/2016 - 11/2018 Ruhr-Universität Bochum
Masterstudium "Economic Policy Consulting" mit dem Schwerpunkt "Quantitative Methods"
Abschluss: Master of Science

10/2013 - 09/2016 Ruhr-Universität Bochum
Bachelorstudium "Management & Economics" mit den Schwerpunkten "Industrial Organisation and Economic Policy" sowie "Management, Information and Decision Making"
Abschluss: Bachelor of Science

10/2011 - 09/2013 Technische Universität Dortmund
Bachelorstudiengang "Statistik"

Praktische Erfahrung
11/2017 - 02/2018 Praktikantin am RWI - Leibniz-Institut für Wirtschaftsforschung
03/2018 - 08/2018 Studentische Hilfskraft am RWI - Leibniz-Institut für Wirtschaftsforschung
05/2018 - 11/2018 Masterarbeit am Forschungsdatenzentrum Ruhr am RWI

Ehrungen und Auszeichnungen:

• Nachwuchsförderpreis Innovation 2019 der microm Academy für die Masterarbeit "Demographic Aging and House Prices"
• 1. Platz des "RatSWD Posterpreis 2020" bei der 8|KSWD für das Poster "Estimating the effect of energy efficiency on house prices in Germany: Does regional disparity matter?"
• GEE Best Paper Award 2021 bei der 10th INREC für das Paper "Estimating the Impact of Energy Efficiency on Housing Prices in Germany: Does regional disparity matter?"
• 1. Platz beim "Poster Award" der 3rd International Conference on Energy Research & Social Science  für das Poster "Inefficient Markets for Energy Efficiency - Empirical Evidence from the German Rental Housing Market"

Forschungsgebiete:

Energie- und Umweltökonomik

Regionalökonomik mit Fokus auf den Immobilienmarkt

Speziell: Energieeffizienz in Wohngebäuden

Projekte:

Laufende Projekte:

• KliWinBa

Abgeschlossene Projekte:

• QUARREE100

• Forschungskolleg NEQ

Publikationen:

• Sieger, Lisa: Empirical analyses of market outcomes regarding energy efficiency valuation and renewable energy investments (1). Dissertation, Essen 2024. doi:10.17185/duepublico/82306BIB DownloadKurzfassungDetails

  Climate change has become a central focus of political and societal concern, ranking as one of the most important global challenges of our time. To meet the objectives of the Paris Agreement, Germany primarily emphasizes the increasing use of renewable energies and an increase in energy efficiency. The German government's ambitious goal is to reach greenhouse gas neutrality by 2045.To achieve this ambitious goal of a climate-neutral building stock by 2045, further investments in energy-efficient refurbishments and renewable energy technologies (and especially renewable heat) are necessary. 

  In this context, the main objective of this cumulative dissertation is to find empirical evidence for effects of energy efficiency improvements as well as of different heating technologies on real estate sales prices and rents. In addition, regarding renewable energy technologies beyond the aforementioned heating systems, different drivers for the expansion of rooftop photovoltaic (PV) systems are investigated.

• Sieger, Lisa: Investigating inefficiencies in the German rental housing market: The impact of disclosing total costs on energy efficiency appreciation. In: Energy & Buildings, Jg. 312 (2024) Nr. 114183. doi:10.1016/j.enbuild.2024.114183BIB DownloadKurzfassungDetails

  Energy efficiency and renewable energy are key pillars of the energy transition that is high on the political agenda of governments in face of the climate crisis. Germany, however, is underperforming in its emissions reduction goals. There is still room for improvement, especially in the building sector – but this is often associated with high upfront investments. There is evidence that the market for energy efficiency in the German rental housing market is inefficient, resulting in underinvestment. To investigate these inefficiencies, this study estimates a hedonic pricing model combined with a total-cost-of-use perspective based on the observation of warm rents for a sample of 3,903,473 rental offers from 2014 to 2021. In a “perfect world”, the effect of the energy performance score given in energy performance certificates as an indicator of energy consumption or demand, respectively, is expected to be zero, as corresponding costs are already included in the warm rent. If the coefficient is significantly different from zero, it can be interpreted as measure for inefficiencies. The study further investigates whether disclosing heating costs in real estate advertisements could lead to a better appreciation of energy efficiency in the rental market and thus contribute to closing the information gap. Results show that the market for energy efficiency is indeed inefficient; however, the disclosure of full information can help to overcome these inefficiencies. These results lead to several important policy implications.

• Breidenbach, Philipp; Jäger, Philipp; Taruttis, Lisa: Aging and real estate prices in Germany. In: Review of Regional Research, Jg. 44 (2024), S. 383-401. doi:10.1007/s10037-024-00210-2BIB DownloadKurzfassungDetails

  Exploiting regional heterogeneity in population dynamics across more than 10,000 municipalities in Germany, we provide robust empirical evidence that population aging depresses real estate prices and rents. Using millions of individual real estate listings and detailed demographic data at the municipality level, we estimate that average sales prices in 2020 would have been up to 12% higher if the population age distribution had been the same as in 2008. We show that population aging not only reduces prices but also increases the availability of real estate. In addition, we document substantial heterogeneity in price responses across dwelling type, property characteristics, and urban-rural status, suggesting that lower housing demand and life-cycle dissaving are driving our results. We predict that population aging will continue to exert downward pressure on house prices and exacerbate regional disparities in Germany.

• Sieger, Lisa: Investigating Inefficiencies in the German Rental Housing Market: The Impact of Disclosing Total Costs on Energy Efficiency Appreciation, 05/2023. Essen 2023. 10.2139/ssrn.4605912) BIB DownloadDetails
• Stein, Tobias; Sieger, Lisa; Weber, Christoph: Disentangling Small-Scale Solar Photovoltaic Adoption: A Spatial Analysis of Decision Factors and Localized Interactions in Germany, 06/2023. Essen 2023. 10.2139/ssrn.4605917) BIB DownloadDetails
• Sieger, Lisa; Weber, Christoph: Inefficient markets for energy efficiency - The efficiency premium puzzle in the German rental housing market. In: Energy Policy, Jg. 183 (2023) Nr. 113819. doi:10.1016/j.enpol.2023.113819BIB DownloadKurzfassungDetails

  On the market where prospective renters meet dwelling offers, competitive forces and rational behavior on both sides would imply that the monthly basic rent should reflect differences in expected monthly heating costs – other things being equal. We test this hypothesis by specifying a hedonic price model reflecting a total-cost-of-renting perspective. Drawing on 844,229 apartment listings for rent from 2014 to 2020 on a small spatial scale, we find a premium for more energy-efficient apartments; however, it is rather small. If the energy performance score decreases by 10 kWh/m2a, the monthly basic rent increases, on average, by roughly €0.01 per square meter living area. The expected energy cost savings thereby exceed the premium by a factor of three to seven. Rather, we find discounts of up to 9.2 % if apartments use heating technologies that are known to be inefficient. We explore various explanations for these outcomes, considering both landlord and renter behavior.

• Breidenbach, P.; Jäger, P.; Taruttis, L.: Aging and Real Estate Prices in Germany, Ruhr Economic Papers #953. Essen 2022. (ISBN 978-3-96973-117-8) doi:10.4419/96973117) VolltextBIB DownloadDetails
• Taruttis, L.; Weber, C.: Inefficient markets for energy efficiency - Empirical evidence from the German rental housing market, 02/2022. Essen 2022. 10.2139/ssrn.4047715) BIB DownloadDetails
• Taruttis, L.; Weber, C.: Auswirkungen von Energieeffizienz auf Immobilienpreise: Eine Analyse fuer Schleswig-Holstein, Dithmarschen und Heide, 01/2022. Essen 2022. VolltextBIB DownloadDetails
• Taruttis, L.; Weber, C.: Estimating the impact of energy efficiency on housing prices in Germany: Does regional disparity matter?. In: Energy Economics, Jg. 105 (2022). doi:10.1016/j.eneco.2021.105750VolltextBIB DownloadKurzfassungDetails

  The German government is aiming for a climate-neutral building stock before 2050 to meet the defined goals of the Climate Action Plan 2050. Increasing the building stock's energy efficiency is therefore a high priority, and investments by private homeowners will greatly influence this, as around 46.5% of German homes are owner-occupied. To identify the possible monetary benefits of investments in energy retrofits, we investigate whether energy efficiency is reflected in the property values of German single-family homes. Therefore, we examine potential heterogeneous effects across regions. With 422,242 individual observations on a 1 km2-grid level from 2014 to 2018, this study adds to the extant literature by 1) examining the energy efficiency effect on housing values for the entire country and specifically investigating regional disparities in this context, and 2) estimating an energy efficiency value-to-cost ratio to compare housing values' increase with initial investment costs and future energy cost savings. Applying hedonic analysis, we find a positive relationship between energy efficiency and asking prices. If energy efficiency increases by 100 kWh/m2a, prices increase by 6.9% on average. We also find evidence for regional disparities. The effects are significantly weaker in large cities than in other urban areas, whereas the impact in rural regions is much stronger. According to this, housing shortage and higher purchasing power per capita were identified as drivers for low energy efficiency premiums. Finally, there is evidence that about 98% of future energy cost savings are already reflected in a higher housing value under myopic expectations regarding future energy prices.
   

• Neumann, U; Taruttis, L.: Sorting in an Urban Housing Market – Is There a Response to Demographic Change?. In: Review of Regional Research (2021). doi:10.1007/s10037-021-00158-7VolltextBIB DownloadDetails
• Taruttis, L.; Weber, C.: Estimating the impact of energy efficiency on housing prices in Germany: Does regional disparity matter?, 04/2020. Essen 2020. VolltextBIB DownloadDetails

Vorträge:

• Sieger, Lisa: Uncovering Inefficiencies in the Market for Energy Efficiency: The Role of Heating Costs Disclosure, 9|KSWD, 27.03.2023, Berlin. Details
• Sieger, L.; Weber, C.: Inefficient Markets for Energy Efficiency - Empirical Evidence from the German Rental Housing Market, Jahrestagung des Verein für Socialpolitik 2022, 12.09.2022, Basel. Details
• Sieger, L.; Weber, C.: Inefficient Markets for Energy Efficiency - Empirical Evidence from the German Rental Housing Market, 3rd International Conference on Energy Research & Social Science, 20.06.2022, Manchester, UK. Details
• Taruttis, L.; Weber, C.: Estimating the Impact of Energy Efficiency on Housing Prices in Germany: Does regional disparity matter?, 10th International Ruhr Energy Conference 2021 (INREC), 16.09.2021, Essen/online. Details
• Taruttis, L.; Weber, C.: Estimating the Impact of Energy Efficiency on Housing Prices in Germany: Does Regional Disparity Matter, 9th Mannheim Conference on Energy and the Environment, 20.05.2021, Mannheim / online. Details
• Taruttis, L.; Weber, C.: Estimating the impact of energy efficiency on housing prices in Germany: Does regional disparity matter?, VfS Jahrestagung 2020, 28.09.2020, Köln / online. Details
• Taruttis, L.; Weber, C.: The Impact of Energy Efficiency on Housing and Rental Prices - Evidence from North Rhine-Westphalia, REAL CORP 2020 - 25th International Conference on Urban Planning and Regional Development in the Information Society, 17.09.2020, Aachen / online. Details

Lehrveranstaltungen:

Energie- und Immobilienmanagement
Einführung in die Energiewirtschaft

Begleitete Abschlussarbeiten:

• Wirtschaftliche und technische Bewertung von Maßnahmen zur nachhaltigen Energienutzung an einem Industriestandort (Masterarbeit BWL - Energy and Finance, 2023)
• Mögliche Geschäftsmodelle in der Energiewirtschaft auf Basis der neuen Marktrolle "Energieserviceanbieter" am Beispiel der GELSENWASSER AG (Bachelorarbeit Betriebswirtschaftslehre, 2022)
• Relevante Rahmenbedingungen für Quartierspeicher im zukünftigen Energiesystem (Bachelorarbeit Betriebswirtschaftslehre, 2022)
• Bewertung der Fördermodelle für Nachhaltigkeit in der Immobilienbranche in Bezug auf Wirtschaftlichkeit und Nutzen (Bachelorarbeit Betriebswirtschaftslehre, 2022)
• Energy Efficiency policies in China and Germany - Contexts, Concepts and Impacts (Bachelorarbeit Betriebswirtschaftslehre, 2022)
• Eine techno-ökonomische Analyse energetischer Sanierungsmaßnahmen anhand realer Gebäude (Masterarbeit BWL - Energy and Finance, 2022)
• Energiekonsum und Investitionen im Zuge des demografischen Wandels am Beispiel von Deutschland und Bulgarien (Bachelorarbeit Betriebswirtschaftslehre, 2021)
• Kalte Nahwärme und Stromobjektnetze - Quantifizierung der Synergien für die Energieversorgung in Neubauquartieren (Bachelorarbeit Wirtschaftsingenieurswesen, 2021)
• Beeinflussen demografische und sozioökonomische Faktoren und deren Entwicklung die Akzeptanz erneuerbarer Technologien und verhindern Sie nachhaltige Investitionsentscheidungen von Haushalten? (Bachelorarbeit Wirtschaftsingenieurswesen, 2021)
• Analyse von Bewertungskriterien und Bewertungsmethodiken in Strom- und Gaskonzessionsverfahren gem. § 46 EnWG im Hinblick auf die geforderte Diskriminierungsfreiheit und Transparenz der Vergabeentscheidung. (Bachelorarbeit Betriebswirtschaftslehre, 2020)
• Räumlich-statistische Analyse der Verteilung von kleinen Aufdach-Photovoltaikanlagen in Deutschland zwischen 2004 und 2019 (Bachelorarbeit Betriebswirtschaftslehre, 2020)
• Rollout intelligenter Messsysteme in der Wohnungswirtschaft - Bewertung von Use Cases aus der Nachfragerperspektive (Masterarbeit Betriebswirtschaftslehre, 2019)
• Perspektiven der Wärmeversorgung in Wohngebäuden – Eine Marktanalyse für Duisburg (Masterarbeit Betriebswirtschaftslehre)

Mitgliedschaften:

Verein für Socialpolitik (VfS)

Inneruniversitäre Funktionen:

Organisation der HEMF-Talks 2022

Organisation des HEMF-internen Brown Bag Seminars