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Wednesday, February 17, 2010

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Balancing Renewables and Natural Resources

NREL Solar Panels - Photo #1
Newly installed solar panels at NREL's National Wind Technology Center face skyward to follow the sun. NREL biologists are experimenting with native seed mixes to reestablish plants and wildlife habitat on the graded site.
National Renewable Energy Laboratory's (NREL) newest source of clean energy—a one megawatt solar array—is supplying laboratory researchers with more than carbon-free electricity. It's also an opportunity to examine a sensitive topic—the potential environmental impacts of large-scale renewable energy projects.

Three-quarters of the U.S. states have adopted aggressive renewable energy mandates to reduce carbon emissions and diminish the environmental damage from more than a century's reliance on fossil fuels.

But utility-scale renewable energy installations also can be significant construction projects—some proposed sites in California and the desert Southwest may cover up to 5,000 acres apiece.

In the West, the U.S. Bureau of Land Management alone has at least 31 renewable energy projects under "fast track" permitting review. And recently, the Secretary of the Interior identified proposed Solar Energy Study Areas where photovoltaic (PV) and solar thermal projects in six Western states are the subject of a special interdepartmental review known as the Solar Energy Development Programmatic EIS.

Some of the nation's best locations for renewable energy are in open, sunny ecosystems such as deserts and shortgrass prairies. These are arid areas where, once disturbed, the vegetation and wildlife may be slow to recover.

"Most plant species in the West have evolved to grow in direct sunlight, and that's where the best resource is for generating solar power," NREL Senior Biologist Brenda Beatty said. "We need to know how shade from PV panels may affect native plant growth and whether those effects will impact wildlife."

NREL Site Operations Project Mgrs. - Photo #2
NREL Site Operations Project Manager Sal Sferrazza and Senior Safety Specialist Michael Stewart of Environment, Health & Safety confer during the final inspection of the solar array field at NREL's National Wind Technology Center.

Collaborating on a Sustainable Installation

At NREL, where construction of both buildings and renewable energy systems is occurring at a rapid pace, environmental experts, construction engineers, and security staff are collaborating to meet NREL's commitment to sustainability and environmental stewardship, while still advancing the U.S. Department of Energy's goals to develop and deploy renewable energy technologies.

PV array fields are typically graded flat and the vegetation removed before installation begins. Soils under PV arrays are frequently sterilized to prevent weed growth, a step that not only introduces chemical agents into the environment, but also prevents the natural revegetation of native plants that could minimize erosion and provide wildlife habitat.

Alternatively, installers spread gravel beneath the solar panels to inhibit weed growth. But gravel can trap heat, which not only can reduce an array's operating life, but also can stress any plants that might grow there.

NREL's newest PV array at the National Wind Technology Center (NWTC) near Boulder, Colorado, is an opportunity to study how ecosystems respond to renewable energy development and develop best management practices that re-establish habitat, minimize weed invasion, prevent erosion, and protect wildlife.

The steps may also help PV companies and utilities reduce long-term operating and maintenance costs.

The NWTC's one megawatt array sits on nearly eight acres near the center's western boundary for which the U.S. Department of Energy has provided an easement to SunEdison. NREL purchases the electricity from SunEdison through a Solar Power and Services Agreement. It's the Laboratory's third sizeable solar array—NREL also has a 94 kilowatt array on the roof of the Science & Technology Facility and a 720 kilowatt array on South Table Mountain, near the lab's Golden, Colorado, campus.

Combined, they are forecast to produce 2.738 gigawatt-hours per year, or about 15 percent of the electricity that NREL is expected to use in fiscal year 2010. The solar renewable energy certificates (RECs) are sold by SunEdison to Xcel Energy to meet Xcel's Renewable Energy Standard solar requirement; NREL purchases replacement RECs, helping NREL to exceed the Energy Policy Act of 2005's goal of 7.5 percent of a federal facility's electricity coming from renewable sources by 2013.

More than a Meadow

Sen. Biologist Brenda Beatty - Photo #3
NREL senior biologist Brenda Beatty is supervising revegetation and wildlife studies at the new solar array field at NREL's National Wind Technology Center.
At the NWTC, most of the vegetation is native shortgrass prairie that includes grasses such as big bluestem; blue gramma and various wheat grasses, forbs such as blanket flower; gayfeather, and Penstemon; and shrubs such as wild rose, hawthorn, and chokecherry.

By studying previous vegetation surveys and walking the site, Beatty and others realized that the NWTC also contains other habitat types that provide critical food and cover for native wildlife species. As part of NREL's sustainability and environmental stewardship commitments, some of these habitats are part of NREL's Conservation Management Area, and are protected from development activities. For example:

  • At the northwest corner of the NWTC, there's a thin ridge of Ponderosa Pine and other montane vegetation typically found at higher elevations.
  • Closer to the array field, a teardrop-shaped seep where groundwater rises and rainwater collects nurtures cattails, rushes, and other wetland plants.
  • On the south edge of the site, there is a small patch of remnant tallgrass prairie. Only one-tenth of one percent of original tallgrass prairie remains in central North America.

Site engineers and Beatty collaborated on ways to adjust the array's layout to avoid these sensitive areas.

In the center of the eight-acre array field, construction crews also left a total of two acres ungraded. This parcel of intact vegetation is meant to serve as a natural source of native seeds, which should help in revegetation efforts.

Crews will also manually reseed graded areas beneath the solar panels in early spring with a blend of native grasses. The composition of the seed blend was formulated to include plants that can tolerate some shading, to help curtail erosion and weed invasion, and to be somewhat fire-resistant.

Under Beatty's supervision, an independent botanist will establish one acre of test plots beneath solar panels, as well as two control plots on similar land away from the solar panels. Data from the test plots will be used to evaluate vegetation success under varying conditions of moisture, seed mixes, mulching, and other treatments.

"The experiments will begin to give us a handle on how PV installations and operations affect vegetation in our portion of the arid West, and the information obtained may be useful for other NREL projects, and for revegetation efforts at other solar installations," Beatty said.

Wildlife Considerations

Solar Power at the Wind Site

  • System Size : 1.16 megawatt dc/ 1 megawatt ac
  • Characteristics : Single axis tracker photovoltaic, ground-mounted
  • Location : National Wind Technology Center
  • Land : 8 acres
  • Start of Operation : December 2009
  • Modules : 6,000
  • Tracker Posts : 2,500
  • System Ownership : SunEdison financed, built, owns, operates, and maintains the system
  • Solar Power and Services Agreement : 20 years with SunEdison, Western Area Power Administration, NREL, and the U.S. Department of Energy

The plant communities at the NWTC attract a variety of animal life from rodents to raptors, including bald and golden eagles. Deer and coyote are the largest mammals commonly found roaming the site, but records show black bears and even mountain lions have appeared at the adjacent Rocky Flats National Wildlife Refuge.

Before the array's installation, Beatty supervised the humane relocation of a black-tailed prairie dog colony from the southwestern corner of the NWTC to another onsite location, in prairie habitat. The relocation was conducted in collaboration with DOE, SunEdison, and other stakeholders.

The prairie dog is a keystone species whose activities are critical to the health of the shortgrass prairie; its burrowing stimulates plant growth and attracts other wildlife, and the colonies provide food for predators.

An independent biologist spent several days mapping the colony and recognizing family groups among the 70 animals. At the new colony, the biologist created artificial burrows by digging trenches four feet deep and 20 feet long and installing irrigation piping to serve as tunnels. After backfilling with dirt, the animals were relocated in family groups. The biologist provided food and water during the two weeks it took the prairie dogs to become acclimated to their new site.

PV isn't the only renewable energy technology drawing the attention of NREL biologists.

At the NWTC, the recent installation of the two largest wind turbines ever tested at the center—a 1.5 megawatt General Electric and a 2.3 megawatt Siemens—have prompted a study of whether individual wind turbines and meteorological towers have an impact on birds and bats there. The program includes weekly bird surveys, surveys of nesting and breeding birds, and weekly searches for dead birds and bats.

At the Laboratory's main campus in Golden, Colorado, NREL senior biologist Tom Ryon is collaborating with stakeholders to establish a wildlife corridor. Such a corridor would allow wildlife to safely move from the top of South Table Mountain to a water source in Lena Gulch, located south of the campus.



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Workshop on Metrology and Standards for Nanoelectronics: More that Moore Applications - Grenoble, France - May 17, 2010

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On the Hill/Around the Nation

02.17.10
NEMA Working on Jobs Bill: During the State of the Union address, President Obama spoke to the issue of jobs creation and pending Senate legislation. NEMA has been working over the past months in promoting provisions in the Senate “Jobs Bill” development. Specific effort has focused on jobs creation by providing tax incentives to retrofit and renovate homes, commercial buildings, and manufacturing facilities with energy-efficient products and technologies. A Senate bill is expected shortly. NEMA is leading efforts to advance public policies to increase deployment of energy-efficient technologies.

Manufacturing Tax Credits Awarded: More than $120 million in manufacturing investment tax credits were awarded by the administration to NEMA members under the NEMA-backed 30 percent manufacturing tax credit funded by the 2009 Recovery Act. The act provided monies for competitively selected projects in advanced energy projects that re-equip, expand, or establish a manufacturing facility. NEMA technologies included lighting, Smart Grid, electrical distribution, transformers, and energy storage. NEMA is leading efforts to promote advanced, energy-efficient technologies and U.S. job creation.

Federal Building Efficiency: As the largest energy consumer in the U.S., the administration announced January 29 that the federal government will reduce its greenhouse gas emissions 28 percent below 2008 levels by 2020 through use of energy-efficient building technologies and renewable energy. By June, 35 federal agencies are required to submit a plan to achieve the reductions, which would save $8 to $11 billion in annual energy costs. NEMA has promoted deployment of energy-efficient technologies to federal agencies and has worked with the agencies to develop recommendations.

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International News

02.16.10
Small Nuclear Reactors Could Close Southern Africa's Energy Gaps
It was in South Africa's interest that its neighbors in the Southern African Power Pool (SAPP) region expand their electricity supply, Stratek Business Strategy Consulting CEO Dr Kelvin Kemm said on Tuesday.

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