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Author Lardies, M.A.; Arias, M.B.; Poupin, M.J.; Manriquez, P.H.; Torres, R.; Vargas, C.A.; Navarro, J.M.; Lagos, N.A.
Title Differential response to ocean acidification in physiological traits of Concholepas concholepas populations Type
Year 2014 Publication Journal Of Sea Research Abbreviated Journal J. Sea Res.
Volume 90 Issue Pages 127-134
Keywords Environmental gradient; Gastropod; Metabolism; HsP70; Gene expression; Phenotypic flexibility
Abstract Phenotypic adaptation to environmental fluctuations frequently occurs by preexisting plasticity and its role as a major component of variation in physiological diversity is being widely recognized. Few studies have considered the change in phenotypic flexibility among geographic populations in marine calcifiers to ocean acidification projections, despite the fact that this type of study provides understanding about how the organism may respond to this chemical change in the ocean. We examined the geographic variation in CO2 seawater concentrations in the phenotype and in the reaction norm of physiological traits using a laboratory mesocosm approach with short-term acclimation in two contrasting populations (Antofagasta and Calfuco) of the intertidal snail Concholepas concholepas. Our results show that elevated pCO(2) conditions increase standard metabolic rates in both populations of the snail juveniles, likely due to the higher energy cost of homeostasis. juveniles of C concholepas in the Calfuco (southern) population showed a lower increment of metabolic rate in high-pCO(2) environments concordant with a lesser gene expression of a heat shock protein with respect to the Antofagasta (northern) population. Combined these results indicate a negative effect of ocean acidification on whole-organism functioning of C. concholepas. Finally, the significant Population x pCO(2) level interaction in both studied traits indicates that there is variation between populations in response to high-pCO(2) conditions. (C) 2014 Elsevier BM. All rights reserved.
Address [Lardies, Marco A.; Belen Arias, Maria] Univ Adolfo Ibanez, Fac Artes Liberles, Santiago, Chile, Email: marco.lardies@ual.cl
Corporate Author Thesis
Publisher Elsevier Science Bv Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1385-1101 ISBN Medium
Area Expedition Conference
Notes WOS:000337854800013 Approved
Call Number UAI @ eduardo.moreno @ Serial 381
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Author Munoz, FD.; Suazo-Martinez, C.; Pereira, E.; Moreno, R.
Title Electricity market design for low-carbon and flexible systems: Room for improvement in Chile Type
Year 2021 Publication Energy Policy Abbreviated Journal Energy Policy
Volume 148 Issue B Pages 111997
Keywords Market design; Electricity; Flexibility; Decarbonization
Abstract Chile was the first country that privatized all generation, transmission, and distribution services, and introduced competition in the generation segment. Nearly four decades after its creation, many features of the original electricity market design remain unchanged. In this paper, we provide a brief history of the Chilean electricity market and explain its main limitations going forward. Some of these include the use of a cost-based mechanism for spot transactions based on a merit-order curve, low temporal granularity of spot prices, missing forward markets to settle deviations from day-ahead commitments, inefficient pricing of greenhouse gas emissions due to administrative rules, and a capacity mechanism that does not reflect a clear resource adequacy target. Many of these limitations are also present in other electricity markets in Latin America that, when privatized, mirrored many features of the electricity market design in Chile. Failing to address these limitations will provide distorted incentives for the efficient entry and operation of resources that could impart flexibility to the system, increasing the cost of decarbonizing the power sector.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0301-4215 ISBN Medium
Area Expedition Conference
Notes WOS:000600550600023 Approved
Call Number UAI @ alexi.delcanto @ WOS:000600550600023 Serial 1284
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Author Rodriguez, R.; Negrete-Pincetic, M.; Lorca, A.; Olivares, D.; Figueroa, N.
Title The value of aggregators in local electricity markets: A game theory based comparative analysis Type
Year 2021 Publication Sustainable Energy Grids & Networks Abbreviated Journal SEGAN
Volume 27 Issue Pages 100498
Keywords Information; Flexibility; Potential game; Adaptive expectations method
Abstract Demand aggregators are expected to have a key role in future electricity systems. More specifically, aggregators can facilitate the harnessing of consumers' flexibility. This paper focuses on understanding the value of the aggregator in terms of aggregation of both flexibility and information. We consider the aggregation of flexibility as the ability to exercise a direct control over loads, while the aggregation of information refers to knowledge of the flexibility characteristics of the consumers. Several game theory formulations are used to model the interaction between the energy provider, consumers and the aggregator, each with a different information structure. We develop a potential game to obtain the Nash equilibrium of the non-cooperative game with complete information and we analyze the system dynamics of consumers using the adaptive expectations method in an incomplete information scenario. Several key insights about the value of aggregators are found. In particular, the value of the aggregator is mainly related to the aggregation of information rather than flexibility, and flexibility is valuable only when it can be coordinated. In this sense, prices are not enough to guarantee an effective coordination.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 2352-4677 ISBN Medium
Area Expedition Conference
Notes WOS:000692827300020 Approved
Call Number UAI @ alexi.delcanto @ Serial 1399
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Author Rosado-Tamariz, E.; Genco, F.; Campos-Amezcua, A.; Markou, G.; Batres, R.
Title Enhanced dynamic simulation approach towards the efficient mining thermal energy supply with improved operational flexibility Type
Year 2021 Publication International Journal Of Energy Research Abbreviated Journal Int. J. Energy Res.
Volume 45 Issue Pages 4265-4284
Keywords combined heat and power; copper mining; dynamic simulation; electrowinning; OpenModelica simulations; operational flexibility; power plant retrofitting
Abstract This paper presents a thermal power plant retrofitting approach focused on improvements in the operational flexibility of existing combined cycle power plants dedicated to providing thermal energy for medium and low-temperature processes in copper mining facilities. The main motivation for this research was aimed at evaluating the operational flexibility of the electrical industry through sector coupling and its effect on solving the energy sector decarbonization issues. The research evaluates the advantages of hybridization systems for supporting the electrical and mining industries to better predict operations. The proposed approach is based on a dynamic simulation scheme that finds the optimal operating parameters of the combined heat and power (CHP) system, such as location, type, and arrangement of each component of the CHP system. The power plant dynamic simulation model was validated against data available in the literature; it was also characterized by real operational data of the San Isidro II power plant installed in Chile. Several alternatives for the cogeneration plant location, as well as the splitter system design, were investigated and then compared. A cogeneration plant design with two heating modules was selected based on the comparative study performed in this work and its CHP system was evaluated for a load reduction case study. The results were compared against a reference model. The proposed CHP system exhibited improved performance: a minimum of 15% of the exhaust gases are required to supply the thermal energy demand of the electrowinning process when a full load is considered. It was also found that an average decrease of 5% of the mechanical power at each steam turbine stage noted. Finally, the proposed CHP system's average thermodynamic efficiency is found to be 19% greater than the power plant average efficiency. Consequently, an average decrease of 32 500 tons of carbon dioxide emissions per year is predicted.
Address [Rosado-Tamariz, Erik; Batres, Rafael] Tecnol Monterrey, Sch Engn & Sci, Ave Eugenio Garza Sada 2501, Monterrey 64849, NL, Mexico, Email: erik.rosado@tec.mx
Corporate Author Thesis
Publisher Wiley Place of Publication Editor
Language English Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0363-907x ISBN Medium
Area Expedition Conference
Notes WOS:000581876000001 Approved
Call Number UAI @ alexi.delcanto @ Serial 1231
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Author Vargas-Ferrer, P.; Alvarez-Miranda, E.; Tenreiro, C.; Jalil-Vega, F.
Title Assessing flexibility for integrating renewable energies into carbon neutral multi-regional systems: The case of the Chilean power system Type
Year 2022 Publication Energy for Sustainable Development Abbreviated Journal Energy Sustain. Dev.
Volume 70 Issue Pages 442-455
Keywords Power system energy planning; OSeMOSYS; Concentrating solar power; Storage; Decarbonization; Carbon neutral; Flexibility
Abstract Reducing emissions from power systems requires enhancing the penetration of non-conventional renewable energy sources (NCRE) in the generation mix. However, such penetration requires high levels of operational flexibility in order to ensure an adequate balance between generation and demand. Concentrating solar power plants with thermal storage (CSP-TES) and battery energy storage systems (BESS) have shown to possess technical characteristics compatible with such high flexibility requirements. However, due to the high capital costs of these technologies, decision-makers must seek for cost-effective configurations and operation modes. This study presents the development of a methodological framework for designing the long-term transition of a multi-regional energy system towards a low carbon emission system. The sought system is characterized by a high penetration of NCRE, and the use of CSP-TES, BESS and electricity transmission settings for providing effective levels of operational flexibility. For this, the transformation of the Chilean electricity system between the years 2018-2050 is studied, using a tailored modification of the well-known OSeMOSYS optimization tool for energy systems planning. The main results indicate that by 2050, and considering a baseline scenario defined for 2016, for most of the scenarios studied the renewable electricity generation would be at least a 90 % and CO2 emissions would be 75 % lower. Furthermore, it is shown that providing operational flexibility to the system requires a mixed generation from hydroelectric reservoirs, CSP-TES plants, BESS, pumped-storage hydropower and natural gas generators. The obtained results allow planning the capacity and operation of CSP and BESS plants, which are adapted to the future flexibility requirements of the Chilean electric power system. Incentive policies like stimuli to growth BESS, would favor primarily the photovoltaic growth of the system at the expense of CSP-TES capacity, while CSP-TES growth incentives would maintain photovoltaic generation levels, but would decrease Wind and natural gas generation.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0973-0826 ISBN Medium
Area Expedition Conference
Notes WOS:000863285300002 Approved
Call Number UAI @ alexi.delcanto @ Serial 1685
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Author Verastegui, F.; Lorca, A.; Olivares, D.; Negrete-Pincetic, M.
Title Optimization-Based Analysis of Decarbonization Pathways and Flexibility Requirements in Highly Renewable Power Systems Type
Year 2021 Publication Energy Abbreviated Journal Energy
Volume 234 Issue Pages 121242
Keywords Power Systems; Planning Decarbonization; Flexibility Optimization; Sustainability; Renewable Energy
Abstract Several countries are adopting plans to reduce the contaminant emissions from the energy sector through renewable energy integration and restrictions on fossil fuel generation. This process poses important computational and methodological challenges on expansion planning modeling due to the operational details needed for a proper analysis. In this context, this paper develops a planning model including an effective representation of the operational aspects of the system to understand the key role of flexible resources under strong decarbonization processes in highly renewable power systems. A case study is developed for the Chilean power system, which is currently undergoing an ambitious coal phase-out process, including the analysis of a scenario that leads to a completely renewable generation mix. The results show that highly renewable generation mixes are feasible, but rely on an effective balance of the key flexibility attributes of the system including ramping, storage, and transmission capacities. Further, such balance allows for faster decarbonization goals to remain in a similar cost range, through the deployment of flexible capacity in earlier stages of the planning horizon.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0360-5442 ISBN Medium
Area Expedition Conference
Notes WOS:000691804300015 Approved
Call Number UAI @ alexi.delcanto @ Serial 1398
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Author Villalobos, C.; Negrete-Pincetic, M.; Figueroa, N.; Lorca, A.; Olivares, D.
Title The impact of short-term pricing on flexible generation investments in electricity markets Type
Year 2021 Publication Energy Economics Abbreviated Journal Energy Econ.
Volume 98 Issue Pages 105213
Keywords Electricity markets; Pricing schemes; Market incentives; Flexibility; Renewable energy
Abstract The massive growth in the integration of variable renewable energy sources is producing several challenges in the operation of power systems and its associated markets. In this context, flexibility has become a critical attribute to allow the system to react to changes in generation or demand levels. Thus, it is critical for market signals at both short and long term scales to include flexibility features, to align agents' incentives with systemic flexibility requirements. In this paper, different pricing schemes for short-term markets are studied, based on various relaxations of the unit commitment problem, including convex-hull approximations, with the aim of representing operational flexibility requirements in a more explicit way. Extensive simulations illustrate the performance of the proposed schemes, as compared to conventional ones, in terms of the capability of the system to properly incentivize flexibility attributes, resulting in better agents' cost recovery and more variable renewable energy utilization. The results show that short-term pricing schemes considered improve the long-term signals for flexible investments but additional changes to market design are still required. Thus, there is a need to revisit historical practices for pricing rules by incorporating additional flexibility-related attributes into them. Several alternatives are discussed and policy recommendations based on these considerations are provided.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Summary Language Original Title
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0140-9883 ISBN Medium
Area Expedition Conference
Notes WOS:000659334500023 Approved
Call Number UAI @ alexi.delcanto @ Serial 1401
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