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Ensuring that electricity systems maintain reliable power supplies is critical to sustaining political support for the low-carbon energy transition. Therefore, it is crucial to analyze the recent electricity disruptions in China and evaluate the government's response. Since 2020, China has faced three unprecedented power outage affecting multiple provinces for weeks. This study investigates the interplay of various factors contributing to China's power crisis and examines the government's policies aimed at addressing immediate issues while advancing broader reforms. Key policy measures involve adjusting the electricity market to allow greater price fluctuations for coal-fired electricity and opening the wholesale market to industrial and commercial users. While this reform is expected to boost market competitiveness, the present market structure falls short of what is likely needed to ensure that power sector dispatch, pricing, and investment can work together to ensure reliable electricity supply in the context of China's transition towards carbon neutrality. To create an advanced, resilient, and flexible renewable energy grid, more intricate reforms across the electricity system, market, regulatory framework, and institutions will be essential. [Display omitted] • Power reliability is critical to keeping political support for energy transition. • A combination of factors led to power curtailments in China in recent times. • Policy responses to address China's power crisis are examined. • Implications of these policy changes are assessed. • An integrated solution framework is recommended. [ABSTRACT FROM AUTHOR]

The purpose of this article is twofold. First, we review model-based analyses that explore the role of power storage in energy systems with high shares of variable renewables. Second, we introduce a new model that is specifically designed for exploring long-term storage requirements. The literature survey focuses on recent contributions in the peer-reviewed energy economics and engineering literature. We compare key characteristics of the different models, provide an overview of model applications, and summarize key findings on power storage requirements. We also evaluate which system values of storage are covered by respective model analyses. Based on the literature survey, we identify common findings and key model features required for a sound assessment of future storage requirements. In order to raise complementary insights, we introduce DIETER, a new dispatch and investment model. The model contributes to the literature by capturing multiple system values of power storage related to arbitrage, capacity, and reserve provision. Further, the model is designed as an open-source tool that can be freely used and modified. Results of a first application of the new model are presented in a companion paper. [ABSTRACT FROM AUTHOR]

Energy scenarios are often used to investigate various possible energy futures and reduce the uncertainty that surrounds energy transition. However, scenario construction lacks consistent and adequate methodological standards, resulting in limited insight into the actual bandwidth covered by current energy scenarios and whether various perspectives on future energy development pathways are all adequately represented. Our research deployed a non-mathematical clustering approach to identify general trends in future energy scenarios and assess the role of Cornucopian and Malthusian oriented world views therein. We found that the futures communicated in quantified future energy scenarios overlap to a large extent and represent only a narrow bandwidth of moderate world views. We argue that the underrepresentation of extreme representations of world views and environmental discourses in energy scenarios skews the overall outlook on possible energy futures. This implies that scenario-informed policy design and decision-making risks bias towards the status-quo. [ABSTRACT FROM AUTHOR]

This study explores the impact of government support and resource endowment (geographical location, climatic conditions, natural resource reserves) on regional energy transitions in China. Thirty regions in China were taken as the study areas, and data samples were selected from 2007 to 2020. The system Generalized method of moments model was employed to outline the path for regional energy transition. The conclusions are as follows. (1) Resource endowment at the national level inhibits energy transition, and the resource endowment in the eastern, central and western regions of China inhibits energy transition. The central region has the strongest inhibitory effect, and the eastern region has the weakest. (2) Policy support can significantly promote energy transition, with the best effects in the central region and the weakest effects in the east. (3) Technological innovation has significantly promoted energy transformation; however, the impact on the western region is not significant. The urbanization level in the eastern region can promote the energy transformation, yet the urbanization level in the central and western regions and the whole country inhibits the energy transformation. Moreover, the tertiary industry will stimulate the energy transformation, and the stimulating effect gradually weakens from east to west. Finally, foreign direct investmentcan promote the energy transition, and the promotion effect of the central region is better than that of the east and west. The research in thiswork provides an important theoretical reference for realizing China's energy transition. Results of government support and resource endowment on energy transition. [Display omitted] • Resource endowment affect energy transition difference in different regions. • Policy support can reduce traditional fossil energy consumption in all regions. • GMM model is used to explore the relationships between variables. • Policy support for regional energy transformation are provided. [ABSTRACT FROM AUTHOR]

In order to achieve the goal of a carbon neutral EU by 2050 and meet the climate targets of the Paris Agreement, a sustainable, efficient, competitive and secure energy system needs to be developed. This paper presents the synthesis of sustainable renewable energy supply networks within the EU-27, proposing a stepwise energy transition in the transport and power sectors, achieving a carbon net neutral target by 2050. A multi-period mixed-integer programming model is developed, with the objective of maximizing sustainability net present value, considering different biomass and waste resources for the production of biofuels, renewable electricity, hydrogen, food and bioproducts, employing different types of technologies. The results show that, with further development of existing technologies, the goal of a carbon-neutral EU can be achieved without compromising food production. Wind farms have proven to be the most promising solution at present for the rapid expansion of electricity generation from renewable energy sources, while the importance of solar photovoltaics is increasing over the years, reaching the 43% share of electricity generation from RES in 2050. Moreover, the energy transition within the EU could have a significant positive impact on the economic, environmental and also social aspects of sustainability, with more than 1.5 million new job opportunities created across the EU over the next 30 years. [Display omitted] • Mathematical programming approach for the transition to carbon-neutral EU by 2050. • Critical review of technologies and synthesis of renewable energy supply networks. • Sustainable multi-period selection of locations, products and types of technologies. • Large economic, eco and social benefits if optimization is carried out at EU level. • Carbon-neutral EU can be achieved through further development of technologies. [ABSTRACT FROM AUTHOR]