Investigating the Impact of Carbon Tax to Power Generation in Java-Bali System by Applying Optimization Technique
Java-Bali power system dominates the national installed capacity and will contribute to about 76% of the national CO2 emissions from the electricity sector in the future. Thus, minimizing CO2 emission from the Java-Bali system can help Indonesia to reduce the national CO2 emissions level. We apply optimization approach to investigate this problem by including carbon tax into the cost function. We analyzed data based on electricity generating system in 2008. In general the optimization showed that diesel and gas turbine is not needed in the power plant system. Further, the simulation showed that if Indonesia adopted carbon tax by US$56/ton CO2 - USD 86/tCO2; it will lead to three major changing. First, carbon tax will increase the cost of power plant or equivalently increase tax revenue to about 2.1% of GDP in a year. Second, combine cycle has important role to offset decreasing output in steam power plant. Finally, by implementing carbon tax, daily CO2 can decrease by 77,586 ton per day. By applying sensitivity analysis, we also found a structural break in marginal cost when carbon tax is higher than US$ 50/tCO2. There are some weaknesses from this study such as not use strong assumption for availability factor and generating costs. This study proposed that government needs to optimize utilization of combine cycle power plan to offset steam power and implement carbon tax above US$ 50/ ton CO2, to reduce CO2 emissions significantly.
A Joint Production and Maintenance Optimization of Closed-Loop Production System under Carbon Emission with a Switching Subcontractor Consideration
This study outlines a new forecasting problem of closed-loop production system under environmental aspect by proposing a new solution based on subcontracting. By studying the impact of the carbon tax on decision-making of production optimization, we propose an original economic production and maintenance strategies to minimize the total cost. Additionally, to reduce the total quantity of carbon and its tax, the subcontractor has a role to help either manufacturing or remanufacturing unit during the process of production. Indeed, the principle objectives are to determine the economic production plans for manufacturing, remanufacturing and subcontracting units as well as the optimal maintenance planning characterized by the optimal number of preventive maintenance actions for manufacturing unit, minimizing the total cost of production, inventory, carbon penalty and maintenance.
Performance Evaluation of Fuzzy Routing Algorithms for a New Fuzzy Mixed Metric Approach
Optimizing routing decisions has been an important subject in research of communication networks. The present paper is introducing a new fuzzy mixed metric approach, which takes routing decisions based on fuzzy costs in parallel to crisp cost of other metrics. The present paper evaluates the new fuzzy approach for its performance. The paper first describes the new fuzzy approach and the fuzzy routing algorithms developed for the approach and then the performance is evaluated both in empirical and analytical terms to show its advantages over the previous fuzzy approaches and traditional link- state routing approach. The paper analyzes the performance for different cases to show the efficacy of load on delay. The present paper bargains with three such cases.