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Esri Partners with The Ray to Map Solar Energy Hot Spots

New Tool Enables Departments of Transportation to Analyze Rights-of-Way for Zero-Carbon Electric Grid Expansion

Research published by the Webber Energy Group (WEG) at the University of Texas at Austin, and by The Ray, a nonprofit studying technologies that can transform the transportation sector for a Vision Zero future, documented the efficiency and economic, societal, and environmental benefits of installing solar arrays on interstate right-of-way (ROW) land. The findings revealed that solar panels at these exits could generate up to 36 terawatt hours (TWh) a year—enough to power 12 million passenger electric vehicles—with the value of the energy generated by roadside solar panels estimated at $4 billion per year.

However, simply installing solar arrays at interchanges, exits, rest areas, and visitor centers—which are maintained by state governments—can be challenging due to safety, environmental, and future land-use considerations.

To help address this, The Ray partnered with Esri, the global leader in location intelligence, to configure an ROW solar mapping tool that can help users quickly and precisely analyze how suitable and economically valuable ROW locations might be for solar array placement.

"Since our founding, The Ray has been inspired by the opportunity we saw in the underutilized land along highway roadsides," said Laura Rogers, deputy director of The Ray. "Now, with the support of this cutting-edge solar mapping tool, The Ray can work with transportation agencies across the country to help them envision and plan solar energy projects using their ROW land in a way that simply wasn't available before."

The new mapping tool is also capable of producing precise configurations of solar arrays on all types of ROW, utilizing the state department of transportation's (DOT) own datasets. Built using Esri's ArcGIS software suite, the tool includes advanced 3D modeling, solar radiation calculations based on elevation and surface, and viewshed analysis.

Rogers continued, "What used to take weeks or months to evaluate suitability for roadside solar development, this tool that Esri provided accomplishes at a fraction of the time with much more precision."

With a location built on 18 miles of west Georgia's section of Interstate 85, The Ray also functions as a proving ground for new technologies like solar power, electric vehicle (EV) charging stations, and smart landscape architecture that can serve as a model for sustainable infrastructure management.

"The partnership between Esri and The Ray essentially helps the country rethink the ROW and move toward a stewardship model for the tens of thousands of acres on the highway roadsides," said Allie Kelly, executive director for The Ray. "It goes beyond transportation and explores the highest and best use for state DOTs. For some, the priority may be rural broadband or buried energy transmission lines."

The organization now works within 15 states with over two dozen transportation agencies to replicate their success as a clean highway test bed.

"The Ray is helping state departments of transportation understand the economic and social value of their ROWs for producing renewable energy and making a contribution to our climate challenges, all designed to support a more sustainable transportation future," said Terry Bills, Esri global transportation industry director.

In addition to calculating the economic potential of all the land area within the ROW, Esri's solar tool also enables state DOTs and other transportation agencies to do the following:

  • Anticipate unintended consequences—and their effect on nearby communities—of installing solar panels on the highway roadsides, such as the interruption of a scenic viewshed
  • Engage in preliminary site planning exercises, including having the ability to alter the shape, size, or scope of any solar array in order to address a potential social impact, and compare the economics of various scenarios
  • Plan solar arrays on other ROW areas like rest stops and park-and-ride sites, providing solar canopy as well as feeding clean energy into EV charging stations available for commuters

Kelly continued, "On The Ray Highway, we have demonstrated renewable solar [arrays] on the roadside, and now with Esri, we have the best tools to help other states move quickly to explore, plan, and build out their own ROW projects."

To learn more about how Esri and The Ray are helping departments of transportation make the best use of their rights-of-way, visit theray.org/technology/solar/.

About The Ray

The Ray is a 501(c)(3) nonprofit charity and highway test bed, located on Georgia's I-85 between LaGrange and the Alabama state line. It begins with an 18-mile stretch of interstate named in memory of Ray C. Anderson (1934-2011), a Georgia native recognized as a leader in green business when he challenged his company, Interface Inc., to pursue a zero environmental footprint. The Ray Highway continues that legacy by paving the way for a zero carbon, zero waste, zero death highway system to build a safer and more prosperous future for all.

About Esri

Esri, the global market leader in geographic information system (GIS) software, location intelligence, and mapping, helps customers unlock the full potential of data to improve operational and business results. Founded in 1969 in Redlands, California, USA, Esri software is deployed in more than 350,000 organizations globally and in over 200,000 institutions in the Americas, Asia and the Pacific, Europe, Africa, and the Middle East, including Fortune 500 companies, government agencies, nonprofits, and universities. Esri has regional offices, international distributors, and partners providing local support in over 100 countries on six continents. With its pioneering commitment to geospatial information technology, Esri engineers the most innovative solutions for digital transformation, the Internet of Things (IoT), and advanced analytics. Visit us at esri.com.

Copyright © 2021 Esri. All rights reserved. Esri, the Esri globe logo, ArcGIS, Excalibur, The Science of Where, esri.com, and @esri.com are trademarks, service marks, or registered marks of Esri in the United States, the European Community, or certain other jurisdictions. Other companies and products or services mentioned herein may be trademarks, service marks, or registered marks of their respective mark owners.

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