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Showing posts from July, 2014

Bridges for Bighorn

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Despite efforts to protect desert habitat in the southwest, major highways criss-crossing the desert are isolating wildlife into smaller pockets and hindering genetic exchange necessary to keep species healthy and resilient.  Desert bighorn sheep are not exempt from this impact; they may be agile and swift, but they are no match for several lanes of speeding cars and semi-trucks, and they tend to shy away from culverts that cross under highways.

Biologists have already noticed that desert bighorn sheep populations in the Mojave and Colorado Deserts are becoming genetically isolated because the region's major highways - such as Interstate 15 and Interstate 40 - and other human developments pose a barrier to sheep movement from one range to another.  According to a 2005 article in Ecology Letters,  biologists found "a rapid reduction in genetic diversity (up to 15%)" among desert bighorn sheep resulting from "as few as 40 years of anthropogenic isolation. Interstate h…

How Much is Too Much Heat for Birds?

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In testimony submitted in advance of California Energy Commission (CEC) evidentiary hearings scheduled for the end of this month, the CEC staff estimates that the impact of heated air above BrightSource's proposed Palen hybrid solar and natural gas project may result in as much as 2.5 times more bird deaths than at the BrightSource's Ivanpah hybrid project (I use the term "hybrid" because Ivanpah will burn nearly 525 million standard cubic feet  of natural gas, annually.  Palen will burn at least 728 million standard cubic feet of gas, annually.  Unlike photovoltaic solar projects, BrightSource's power tower design needs fossil fuels to warm up the boilers that also convert the sun's energy into electricity).
BrightSource has argued that birds are only at risk of death from solar flux (air heated by the concentration of the solar mirror field) in the air space close to the power tower where the heat is most intense.  CEC staff, however, assesses that birds a…

Coolwater-Lugo Transmission Line: A Horse Following the Cart

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Southern California Edison (SCE) is suggesting that interconnection of Abengoa's Mojave Solar project is the primary reason it needs to build the nearly 75 mile Coolwater-Lugo transmission line through the Lucerne Valley, according to the Daily Press, even though Abengoa told the California Energy Commission (CEC) and Bureau of Land Management (BLM) in 2010 that these transmission lines would not be necessary.   Misrepresenting the need for new transmission lines during the CEC and BLM review of the project would have allowed Abengoa to downplay the costs and environmental impacts associated with approving the project.  The Coolwater-Lugo transmission line is likely to cost ratepayers at least 509 million dollars, and bring bulldozers and transmission towers to mostly undisturbed desert.

Without the Abengoa Mojave Solar project as an excuse,  SCE probably could address other distribution needs - such as relieving the transmission bottleneck at Kramer Junction - by upgrading existi…

First Solar Begins Ecosystem Destruction in Ivanpah

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First Solar has begun construction on the 2.6 square mile Stateline Solar project - one of the company's two additional solar projects in the Ivanpah Valley - after a judge turned down a request for an injunction by the Defenders of Wildlife.   First Solar is also expected to begin bulldozing desert habitat for the Silver State South project, which will destroy over 3.7 square miles of tortoise habitat on the Nevada side of the Ivanpah Valley.  Both projects will destroy some of the best quality desert tortoise habitat in the Mojave Desert and, more insidiously, likely sever a habitat corridor linking separate populations of the tortoise.
Tortoises Lose Key Habitat

According to construction monitoring reports,  First Solar has already translocated at least 16 tortoises - 8 adults and 8 juveniles - from the first phase of construction, which may be an area of approximately 500-700 acres (the final environmental impact statement indicated "zone 1" of construction would be …