As California
ponders an increase to its Renewable Portfolio Standard, which would
require the state’s utilities to obtain 50% renewable energy by 2050, a set of
important questions revolves around the size and siting of solar power. Some
believe that the proper solution involves large-scale solar arrays in the
desert, such as Abengoa’s
Mojave Solar Project or the Ivanpah
Solar Array. In contrast, others argue
that the state should favor a distributed power system, with rooftop arrays and
energy storage systems satisfying on-site energy demand.
The Desert Renewable Energy
Conservation Plan, which has been in the works for five years, generally
embraces large-scale development. The Plan is a 10,000-page draft document that
sets out a “landscape-scale
renewable energy and conservation” plan for more than 22 million acres of
desert in seven California counties. The Plan attempts to balance development
of 20,000 megawatts of new renewable energy with conservation goals for desert
landscapes and species. The Plan aims to concentrate projects in “Development
Focus Areas” with strong renewable resources, access to transmission, and
where developers can effectively mitigate environmental impacts.
The Plan’s public comment period closed on February 23,
2015. The four agencies responsible for the Plan (the California Energy
Commission, the California Department of Fish & Wildlife, the U.S. Fish
& Wildlife Service, and the U.S. Department of the Interior) received over
12,000 comments. Prominent commenters include the U.S. Environmental
Protection Agency (EPA) and five of the seven counties in which the Plan would
operate.
The counties are concerned
that the Plan would have disparate impacts on different counties, excessively
burden private land, and could close off private land to other lucrative uses
such as agriculture or mining. Particularly, some counties worry about being
burdened with costly environmental mitigation projects without necessarily enjoying
economic benefits from local projects. Additionally, some counties noted that
the Plan’s Preferred Alternative would designate roughly three times as much
private land as public land for development, while setting aside roughly 1.7
million acres of private land for conservation projects. Inyo County is only 2%
private land, and San Bernardino County is only 25% private land. These
counties thus worry that closing private land for conservation or slating it
for exclusive use by renewable energy development could harm local economies.
As a result, several counties are threatening to withdraw their support for the
Plan.
Meanwhile, EPA has called for a fundamental reconsideration
of the Plan’s goals and means. Its comments
call into question the need for utility-scale solar development, citing “the
sharp decline in the cost of rooftop solar-powered electricity and rapid
deployment of energy storage.” As distributed solar becomes more widespread,
the need for utility-scale solar power diminishes. This line of argument is
popular among environmentalists
as well. EPA also expressed concerns about particulate emissions (mostly dust)
resulting from disturbance of the desert’s surface, about impacts on ephemeral
streams, and on the possible designation of the Silurian Valley (a pristine
natural area near Death Valley, where the Bureau of Land Management recently rejected
a renewable energy project) as a Development Focus Area.
The agencies responsible for the Desert Renewable Energy
Conservation Plan will now have to wade through the more than 12,000 comments
on the current draft. Considering that creating the draft took more than five
years, it is hard to know when they may issue a final plan. (Their schedule is silent on
the issue.)
In the meantime, distributed solar power is continuing a
meteoric rise in California. Under the Go Solar California
initiative, which is a set of state incentives for solar power, homes and
businesses have installed nearly
1,900 MW of solar power. To put that in perspective, the utility-scale
Mojave Solar Project has a capacity of 280
MW, while the Ivanpah Solar array (the largest solar thermal plant in the
world) has a capacity of 392
MW. This comparison suggests that it is quite possible for distributed
solar power to generate enough energy to offset the need for larger,
utility-scale projects.
Using distributed solar power to reduce the need for
large-scale projects is a good idea. Distributed generation offers a whole
suite of benefits that allow utilities—and thus ratepayers—to avoid many types
of costs (including transmission costs, distribution costs, and environmental
compliance costs, to name a few). But more fundamentally, distributed generation
offers a unique opportunity to preserve the natural environment by improving
the built environment. As California ponders how (and whether) to reach 50%
renewable energy by 2050, it should emphasize distributed solar power.
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