What criteria should we use to better plan for resilient energy systems? How do socio-economic, technical and climate change related challenges affect sustainable energy systems planning worldwide? What does the situation look like in a region outside the European industrialized perspective? With these questions in mind, four years ago, the research project Energy Modeling for the Real World Transforming Modeling Approaches for Sustainable and Resilient Energy Planning (MEASURES) embarked on an interdisciplinary study, using Ghana as a case study region. The aim was to formulate modeling approaches that yield optimal recommendations for climate-resilient energy planning considering various dimensions – energy demand, infrastructure, climate data, resiliency and robustness of a system and an array of socio-economic factors – that can be applied to cities and countries across the globe.

In their studies, the scientists paid particular attention to issues that are not taken into account in traditional energy models: climate change-induced extreme weather events, climate migration, informal economic systems (i.e., economic activities that are unmonitored and unaccounted for in official GDP figures), unstable currencies, power system failures and suppressed energy demand (e.g., due to poor infrastructure or financial resources). Ghana, in particular, faces these challenges, which makes the region an ideal case study. Thus, Mashael Yazdanie, Group Leader of Macro-Energy Systems at Empa's Urban Energy Systems Laboratory, spearheaded the cross-disciplinary, international MEASURES project, funded by the Swiss National Science Foundation (SNF) between 2020 and 2023.

A specific course of action based on regional characteristics

The researchers examined a range of challenges relevant to energy system planning in Accra. What climate change-related environmental changes are to be expected in the coming decades? How will these affect regional migration? What influence does the informal economy and suppressed energy demand have on strategic energy planning? To what extent will currency depreciation thwart energy planning and the development of sustainable energy infrastructure? Using the open-source modeling framework, OSeMOSYS, they developed an energy system model for Accra and investigated these issues. The model yielded cost-, carbon- and resilience-optimized energy system capacity and operational planning decisions for Accra, considering its unique local conditions.

For example, concerning the deployment of sustainable energy technologies under the threat of currency depreciation, the researchers find that "investments in photovoltaic and wind energy are most affected by rising depreciation in the case of Accra. If PV systems are part of larger sustainability commitments in Accra – as prescribed by Accra's current Climate Action Plan – our results indicate that these investments should take place earlier rather than later in the planning horizon to ensure affordable deployment." According to their study, Accra should additionally focus on efficient waste resource capture and utilization, as well as decarbonization of transportation through fleet electrification for robust and sustainable urban energy system planning.