Meeting Clean Energy Goals Will Require the Grid of the Future

The transmission grid is the critical superhighway that connects energy supply and demand. But our grid was designed for the power plants of the past—not for the diverse range of resources and technologies of our clean energy future. Over 70 percent of the nation’s transmission infrastructure is more than 25 years old, and in many areas of the country constraints have already been an impediment to renewable power. To meet greenhouse gas reduction goals, we will need to expand electric transmission systems by 60 percent by 2030 and possibly triple the capacity of these systems by 2050. The Infl ation Reduction Act has large loan guarantees to spur grid investment, but hundreds of billions more will be eventually needed

Meeting Clean Energy Goals Will Require the Grid of the Future

The transmission grid is the critical superhighway that connects energy supply and demand. But our grid was designed for the power plants of the past—not for the diverse range of resources and technologies of our clean energy future. Over 70 percent of the nation’s transmission infrastructure is more than 25 years old, and in many areas of the country constraints have already been an impediment to renewable power. To meet greenhouse gas reduction goals, we will need to expand electric transmission systems by 60 percent by 2030 and possibly triple the capacity of these systems by 2050. The Infl ation Reduction Act has large loan guarantees to spur grid investment, but hundreds of billions more will be eventually needed

The SALTENA Experiment: Comprehensive Observations of Aerosol Sources, Formation, and Processes in the South American Andes

International audienceThis paper presents an introduction to the Southern Hemisphere High Altitude Experiment on Particle Nucleation and Growth (SALTENA). This field campaign took place between December 2017 and June 2018 (wet to dry season) at Chacaltaya (CHC), a GAW (Global Atmosphere Watch) station located at 5,240 m MSL in the Bolivian Andes. Concurrent measurements were conducted at two additional sites in El Alto (4,000 m MSL) and La Paz (3,600 m MSL). The overall goal of the campaign was to identify the sources, understand the formation mechanisms and transport, and characterize the properties of aerosol at these stations. State-of-the-art instruments were brought to the station complementing the ongoing permanent GAW measurements, to allow a comprehensive description of the chemical species of anthropogenic and biogenic origin impacting the station and contributing to new particle formation. In this overview we first provide an assessment of the complex meteorology, airmass origin, and boundary layer-free troposphere interactions during the campaign using a 6-month high-resolution Weather Research and Forecasting (WRF) simulation coupled with Flexible Particle dispersion model (FLEXPART). We then show some of the research highlights from the campaign, including (i) chemical transformation processes of anthropogenic pollution while the air masses are transported to the CHC station from the metropolitan area of La Paz-El Alto, (ii) volcanic emissions as an important source of atmospheric sulfur compounds in the region, (iii) the characterization of the compounds involved in new particle formation, and (iv) the identification of long-range-transported compounds from the Pacific or the Amazon basin. We conclude the article with a presentation of future research foci. The SALTENA dataset highlights the importance of comprehensive observations in strategic high-altitude locations, especially the undersampled Southern Hemisphere