The World's #1 Renewable Energy Network for News, Information, and Companies.
Untitled Document

Concentrating Solar Power Under Fire: Glaring Planning Oversight or Easily Remedied Issue?

Currently the world’s largest solar thermal plant, the Ivanpah Solar Electric Generating System has been in full operation less than two months and already concerns have been raised about its environmental impacts. Complaints from pilots flying near the concentrating solar power (CSP) plant state that on numerous occasions, the intense reflective glare coming from the plant’s heliostat mirrors has caused pilots to become momentarily blinded. Ivanpah is located roughly 40 miles from McCarran International Airport in Las Vegas, and approximately 25 miles from the Jean Sport Aviation Center in Jean, Nevada.

While it might be easy to dismiss this issue as a “glaring” oversight on the part of its planners (Ivanpah is owned by BrightSource Energy and NRG Energy) further investigation reveals that issues of glint and glare from the plant’s reflective arrays were addressed during the Application for Certification submitted to the California Energy Commission in 2007. The first detailed analysis was included in a 2008 response from CH2M HILL to the CEC’s review of the application.

In their response, CH2M HILL stated that beam safe intensity calculations had been performed and that “the likelihood of random heliostat beam hazard to aircrafts flying in the area is infinitesimally remote.” CH2M HILL is a Colorado-based engineering company contracted by state and federal agencies for design and construction consultation.

Subsequently, the Heliostat Positioning Plan and Tower Luminance Plan, which described even greater analyses of potential glare hazards, was submitted in 2013.

Frank “Tex” Wilkins, executive director of the Concentrating Solar Power Alliance and formerly of the Department of Energy, said the conversation about glare and CSP plants is not a new one. Wilkins took part in discussions in 2009 that looked into the issue. “The FAA convened a panel,” Wilkins said, “where extensive studies were performed on the topic. The final determination was made that glare from CSP plants, in particular glare from power towers, would not create an issue for pilots.”

Cause and Effect

Although it has been reported elsewhere that the incidents may have occurred as a result of pre-launch testing and repositioning of heliostats that took place in August of 2013 — which coincides with the same time frame during which two complaints were filed with the Federal Aviation Administration's Aviation Safety Reporting System — Clifford Ho of Sandia National Laboratories’ Concentrating Solar Technologies Department thinks otherwise.

“I believe some of the glare that’s being viewed is taking place when the heliostats are in a standby mode,” Ho said.

During peak daylight hours, it is common for a number of heliostat mirrors to be taken offline to prevent heliostats from directing more thermal energy to the turbine than it is capable of receiving. Ho said that during standby, these heliostats are focused on aim points next to the receiver, forming a ring of glare above the tower.

According to Ho, the sunlight reflected from heliostats that are in standby mode could be having an exacerbating effect on the amount of reflection being emitted.

In examining photos of the glare taken by passengers flying over the Ivanpah plant, Ho said it’s apparent to him the intense light is emanating from the heliostats not in use. “You can clearly see the difference between what’s just the diffuse reflection from the towers versus one or more heliostats that are in standby mode and reflecting light toward the observer.”

Ho has performed helicopter surveys of heliostats in standby mode at Sandia National Laboratories’ National Solar Thermal Test Facility. “It’s bright,” he said, emphasizing that the Sandia CSP array is much smaller than that of Ivanpah. “When you’re close, it can be like looking into the sun.”

Requests for Remedy and Possible Solutions

On March 10, the Clark County Department of Aviation (CCDOA) sent an official notification of complaint to BrightSource Energy, the California Bureau of Land Management, and the California Energy Commission. In the docket, the CCDOA requested that BrightSource take a number of actions to “respond to and address any complaints about adverse visual impacts to pilots.”

Included in the docket are requests for BrightSource Energy to take measurements of any observed glare and to determine if that glare is within the “maximum permissible exposure.” Ho indicated plans are already in motion to respond quickly.

“We will be doing some additional monitoring of the glare at the site,” Ho said. In addition to helicopter surveys of the area surrounding the Ivanpah plant, ground-based evaluations will also be performed.

One possible solution, as suggested by Ho, is to reposition heliostats that are in standby mode so that they stand vertically — thus reflecting the glare toward the ground instead of upward. Regardless of whether that’s done, Ho believes it is imperative that pilots are briefed on the location of the plant so that they will be aware of potential glare issues.

Ian Gregor, Public Affairs Manager for the Pacific Division of the FAA, concurs. “The FAA is aware of potential glare from concentrating solar plants and is exploring how to best alert pilots to the issue,” Gregor said. “The final Environmental Impact Statement for the Ivanpah project includes mitigation measures that address the issue of glare, which the aviation community raised during the EIS process.”

Sandia National Laboratories currently offers a Solar Glare Hazard Analysis Tool that Ho helped to create, which he says is fundamental to preventing similar issues from arising in future solar development projects. “The solution is to be aware of the potential issues of glare during the planning stage, to ensure it doesn’t become a hazard.”

Lead image: Trekandshoot via Shutterstock

Untitled Document

RELATED ARTICLES

Sunrise in Pakistan as the Country Delves into Solar PV

Robert Harker Pakistan has joined the list of countries that are exploring solar power as a means to bridge critical energy generat...

Global Renewable Energy Roundup: China, Kenya, Turkey, India Seeking More Renewables

Bloomberg News Editors China is being encouraged by three industry groups to double the nation’s solar-power goal for 2020 to make up for sh...

Why Smarter Grids Demand Smarter Communications Networks

Mark Madden

Historically, utility networks and communications networks have had little in common.

The Importance of “Switching Costs” to the US Residential Solar Industry

Paula Mints The DoE and numerous organizations and governments globally are focused on driving down the cost of solar convinced t...

PRESS RELEASES

Appalachian's Energy Center assists counties with landfill gas to energy projects

The Appalachian Energy Center at Appalachian State University recently completed a proj...

Array Technologies’ DuraTrack HZ v3 Continues to (R)evolutionize at SPI

Array Technologies, Inc. (ATI) prepares to showcase its recently launched tracking syst...

Redesigned HydroWorld.com Video Gallery

Hydropower news and information, and interesting promotional announcements are now avai...

30 days to GRC Annual Meeting & GEA Geothermal Energy Expo

The Geothermal Resources Council (GRC) has announced that it is only 30 days to go to t...

FEATURED BLOGS

Appalachian's Energy Center assists counties with landfill gas to energy projects

Activity supported with Z. Smith Reynolds Foundation funding BOONE—The Appalachian Energy Center at Appalachia...

Discounted Room Rates for Geothermal Event end Friday

Discounted room rates for GRC Annual Meeting & GEA Geothermal Energy Expo end Friday Room rates for this prestigi...

3 Reasons To Follow-Up

It’s very important to begin nurturing your relationship with a customer immediately after the project you sold...

Who are the Solar Early Adopters? - the “Tipping Point” is Looming

We all know why people go solar: investment purposes, immediate savings, environmental concerns, and grid independenc...

FINANCIAL NEWS

Vince Font is a freelance journalist specializing in the fields of renewable energy, high tech, travel, and entertainment. Read his blog at www.vincefont.com or follow him on Twitter @vincefont.

CURRENT MAGAZINE ISSUE

Volume 18, Issue 4
1507REW_C11

STAY CONNECTED

To register for our free
e-Newsletters, subscribe today:

SOCIAL ACTIVITY

Tweet the Editors! @jennrunyon

FEATURED PARTNERS



EVENTS

Intersolar North America 2016

Exhibition: July 12 - 14, 2016; Conference: July 11 - 13, 2016 Intersola...

Intersolar South America 2015

Exhibition and Conference: September 1-3, 2015 Intersolar South America ...

Intersolar Europe 2016

Exhibition: June 22-24, 2016; Conference: June 21-22, 2016 Intersolar Eu...

COMPANY BLOGS

Less Is More

When you’re giving a presentation, one of the easiest things to do...

Captivology

One of the biggest challenges we face as efficiency sales professionals ...

How To Optimize Your Meeting Schedule

Do you spend more time in meetings than you do actually working? While m...

NEWSLETTERS

Renewable Energy: Subscribe Now

Solar Energy: Subscribe Now

Wind Energy: Subscribe Now

Geothermal Energy: Subscribe Now

Bioenergy: Subscribe Now  

 

FEATURED PARTNERS