Regional Analysis

The possibility of using electricity dispatching strategies to achieve a 50% nitrogen oxide (NOx) emission reduction from electricity generating units was examined using the grid of the Electricity Reliability Council of Texas as a case study. Simulations of a hypothetical policy demonstrate that imposing higher NOx prices induces a switch from some coal-fired generation to natural gas generation, lowering NOx emissions. The simulation is for a day with relatively high electricity demand and accounts for transmission constraints. In addition to the lowering of the NOx emissions, there are co-benefits of the redispatching of generation from coal to natural gas, including reductions in the emissions of sulfur oxides (24%–71%), Hg (16%–82%) and CO2 (8.8%–22%). Water consumption was also decreased, by 4.4%–8.7%. Substantial reductions of NOx emissions can be achieved for an increased generation cost of 4–13%, which is due to the higher fuel price of gas relative to coal (assuming a price of $3.87 per MMBTU (MMBTU: million British thermal units) for natural gas, and $1.89 per MMBTU for coal). However, once the system has reduced NOx emissions by approximately 50%, there is little incremental reduction in emissions due to further increases in NOx prices.

© 2011 IOP Publishing Ltd

We calculate CO2 emissions embodied in China’s net exports using a multi-regional input-output database. We find that the majority of China’s export-embodied CO2 is associated with production of machinery and equipment rather than energy-intensive products, such as steel and aluminum. In 2007, the largest net recipients of embodied CO2 emissions from China include the EU (360 million metric tons, mmt), the U.S. (337 mmt), and Japan (109 mmt). Overall, annual CO2 emissions embodied in China’s net exports totaled 1,177 mmt, equal to 22% of China’s total CO2 emissions. We also develop a global general equilibrium model with a detailed treatment of energy and CO2 emissions. We use the model to analyze the impact of a sectoral shift in the Chinese economy away from industry and towards services, both without and with a decrease in China’s trade surplus, and a tax on energy-intensive exports, which reflect policy objectives in China’s Twelfth Five-Year Plan (2011–2015). We find that without a decrease in the trade surplus, both policies will have a limited impact on China’s net exports of embodied CO2 emissions. The policies have an even smaller effect on global emissions, as reduced production in China is partially offset by increased production elsewhere.

Professors Henry Jacoby and Valerie Karplus (MIT Sloan School of Management) and their collaborator, professor Xiliang Zhang (Tsinghua University; MIT-Tsinghua China Energy & Climate Project) speak at this event. Addressing an audience of COP21 attendees, MIT alumni, current students, and others, they discussed how China’s actions coming out of COP21 could help shape the future global energy system. 

The U.S. National Renewable Energy Laboratory (NREL) is leading a study of renewable electricity futures for the U.S. Department of Energy (DOE) and has enlisted the MIT Global Change Program for analytical support. In addition to the MIT component of the effort, the NREL study involves a set of subject matter experts as well as a broad set of stakeholders including financiers, utilities, system integrators, and equipment manufacturers.

Federal standards for fine particulate matter and tropospheric ozone have become increasingly stringent over the past several decades. States preparing attainment plans will be challenged with accounting for the regional and longer-range transport of these pollutants and their precursors and with the higher marginal costs of additional permanent or annual emissions reductions in the future.

This project will evaluate the economic and technical potential of renewable-based power systems in Africa under a trading regime. Linking hydropower generated in river basins across the continent has the potential to smooth annual and seasonal fluctuations in hydropower output and enable larger penetrations of intermittent renewable energy technologies.

The goal of this project is to study the future climate change of Singapore and surrounding regions. Using the MIT Integrated Global System Model (IGSM) and a 3-D atmospheric and ocean general circulation mode (CESM) coupled with a size- and mixing-dependent aerosols model, among others, we will quantify differences in factors such as convection, precipitation, cloud coverage and surface heat fluxes.

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