The power grid may determine whether we can kick our carbon habit

  • High voltage transmission lines and turbines at the Dry Lake Wind Project near Holbrook, Arizona. The project is operated by Iberdrola Renewables, and all its power is purchased by Salt River Project.

    Jonathan Thompson
  • The 2011 San Diego blackout.

    Sean M. Havvey/U-T San Diego/
  • The Palo Verde Nuclear Generating Station west of Phoenix can crank out more megawatts than any power plant in the nation, and the associated Palo Verde/Hassayampa switchyard is the most active electricity trading hub in the West.

    Jonathan Thompson
  • The switchboard and generator of the world's first single-phase AC power transmission system at the Ames hydroelectric plant near Telluride, Colorado. The plant, now owned by Xcel Energy, continues to feed up to 3.75 MW into the grid.

    Library of Congress, HAER COLO,57-AMES.V,2A-6
  • The Alhambra control center of the California Independent System Operator, which manages about 80 percent of the state's grid and the mix of energy going into it.

    California Independent System Operator
  • Wind turbines line the ridge above the John Day Dam on the Columbia River. When water levels are highest, the Bonneville Power Administration may force wind generators to shut down, to avoid overwhelming the grid. Courtesy

    Samuel M. Beebe/Ecotrust
  • Contractors watch last April as a helicopter places a lattice tower for the Sunrise Powerlink, the controversial 117-mile, 500-kilovolt electric transmission line that runs from Imperial County to San Diego, California.

    Sam Hodgson/Bloomberg via Getty Images
  • High-voltage transmission line in Arizona.

    Jonathan Thompson

Page 5

As the spark that lit the San Diego Blackout hurtled full-throttle across the electrical landscape, various lines, substations and generators tripped off-line, throwing the system out of balance. Grid operators tried to extinguish the flare-ups by cranking up peak generators, but they weren't quick enough. Meanwhile, the various collapses in the system forced virtually all of San Diego's electricity onto one set of power lines, running from San Onofre Nuclear Generating Station southward into the city. At 3:38:21 p.m., the lines tripped, and San Onofre's reactors shut down. Milliseconds later, all of Southern California was without power.

The ensuing 12 hours of darkness cost the city and its businesses an estimated $100 million for everything from spoiled food to lost productivity to government overtime. Officials at San Diego Gas & Electric quickly used the failure to their political advantage, speculating that if the Sunrise Powerlink -- a controversial power line bringing solar and wind power 120 miles from the Imperial Valley west to San Diego -- had been in operation, it might have prevented the outage or helped facilitate a quicker recovery. (The Powerlink started carrying wind power from the also-controversial Ocotillo wind farm this January.)

It took regulators six months to sort through what had happened, and in spring 2012, they released a report detailing the to-the-millisecond timeline, and assigning blame for the outage on poor communication, bad procedures and sloppy planning. Grid-oriented greens were at least somewhat validated: Had better "real-time situational awareness," or a smarter grid, been in place, the whole thing might have been avoided, according to the report. A good energy imbalance market might have given grid operators quicker access to backup, alleviating some of the pain.

One thing is certain: More blackouts will occur. California grid operators worry they could come this summer: San Onofre has been offline for repairs (unrelated to the 2011 outage) since January 2012, and no one can be certain when it will be back in service.

But perhaps the biggest, most insidious threat is our warming climate, which is already attacking the grid on many a front, according to the report, Global Climate Change Impacts in the United States. Weather-related outages have increased tenfold in the last two decades, and it's only bound to get worse. Hotter days mean bigger peak loads; higher loads and higher temperatures strain power lines, causing them to lose more of the electricity flowing through them and to sag into vegetation: The West's biggest outage thus far put some 7.5 million people across seven states into the dark when, during a triple-digit heat wave, a line near Portland sagged into a filbert tree, sparking a cascading outage. And of course, heat and drought exacerbate wildfires, which can take out major power lines as happened in 2007 in San Diego, as well as diminish hydroelectric capacity from reservoirs. Meanwhile, it's our fossil-fueled electricity system that emits the largest share -- some 40 percent -- of greenhouse gases.

We may have reached the point at which adaptation is the best approach. While shopping malls across San Diego shut down entirely, and Hooters turned away customers, some bars fired up generators to keep the lights on, and the customers poured in. An Albertson's grocery store kept the coolers humming with a natural gas-powered fuel cell and had a banner day. They had all effectively thumbed their noses at the 20th century's finest engineering achievement and instead gone back in time to the days of the ultra-local Ames micro-grid. By doing so, they breezed right through what so many others experienced as a catastrophe.

On Sept. 8, 2011, Sasha Seyb, a freelance decorative artisan in her late 30s, who has lived in downtown San Diego for several years, was driving from work on the coast to her home when the outage hit. She first noticed that streetlights were blinking, and then realized that neither her radio nor her cellphone worked. Her first reaction was to panic, thinking some sort of major catastrophe had hit. But after she got home, and the news circulated that it was merely a technical glitch way over in Arizona, she and her whole neighborhood simply breathed a sigh of relief.

"Everybody was outside, the kids were all eating ice cream, adults were drinking their beer and grilling steaks," she says. "It was a giant block-party barbecue. It was a really neat vibe, a nice feeling. And that night, you could actually see the stars for once."

Jonathan Thompson is a senior editor at High Country News. He pursues his unhealthy obsession with esoteric topics out of Durango, Colorado.

This coverage is supported by contributors to the High Country News Enterprise Journalism Fund.

Howard Johnson
Howard Johnson Subscriber
May 28, 2013 11:48 PM
Great article, continue to follow the ACC, as it is critical for AZ to push solar ! !
Jonathan Thompson
Jonathan Thompson Subscriber
May 30, 2013 10:42 AM
Editor's note: A comment was deleted from this thread because the commenter, after reading the rest of the story, retracted the comment (realizing the story actually did address the issue that he thought it had overlooked).
Toby Thaler
Toby Thaler
Jun 04, 2013 04:00 PM
"There is probably no other five-square-mile patch on the planet with more electrical generating capacity." Well...

Palo Verde nukes = 3.3 Gw; Arlington Valley gas turbines = 0.6 Gw; solar in area= 0.5 Gw(?)

Grand Coulee Dam generates 6.8 Gw. Three Gorges Dam in China = 22.5 Gw. In fact, it looks like there are a dozen or more hydro projects that generate more than the entire Palo Verde hub area, unless I am missing some large generators (it's not an area I'm familiar with). See[…]/List_of_largest_hydroelectric_power_stations

Palo Verde does not even appear to be close to the largest generator of thermal power. See[…]/List_of_largest_power_stations_in_the_world

Please don't put inaccurate factual puffery into your reporting; it detracts from the high quality of the article.
Jonathan Thompson
Jonathan Thompson Subscriber
Jun 04, 2013 09:30 PM
Toby: Thanks so much for keeping me on my toes. We love our readers for that very reason. I'll confess that when I wrote that, I did not consider those giant dams -- and certainly not Three Gorges in China, which dwarfs just about everything. As for the generating capacity for the Palo Verde hub area, here are my numbers: Palo Verde Nukes: 3,800 MW (SRP figures); Mesquite natural gas plant: 1,250 MW; Arlington Valley Solar: 250 MW; Red Hawk natural gas: 1,060 MW; Arlington Valley Natural Gas plant: 577 MW; Mesquite Solar: 150 MW. For a grand total of 7,087, which is greater than Grand Coulee Dam, and collectively makes it the largest generator in the nation (not the planet! It is my understanding, though, that the Kashiwazaki-Kariwa nuke plant in Japan, which would be bigger, is shut down for "inspections" following the Fukushima disaster, but may never reopen because it lies on a fault). And the Palo Verde energy park, if you can call it that, continues to grow: The Mesquite Solar facility will be 700 MW when it's finished (and I may have missed more solar facilities. To be honest, it's hard to keep track). All of which to say, you're right: the Palo Verde area collectively adds up to have the biggest generating capacity in the nation, but not the planet. A handful of giant dams have that distinction. Thanks again for pointing that out.
Toby Thaler
Toby Thaler
Jun 05, 2013 01:33 PM
And thank you very much for the more detailed list of generating plants in the area. That's 54% nuke, 41% fossil thermal, and 6% renewable. Not a pretty picture as we move onto the down slope of peak fossil fuels.

And, as wiki points out, "Since the nuclear fuel cycle is effectively not closed, Hubbert peak theory applies." The analysis of this aspect of nuclear power is very unsettled. See

Good reporting, thanks.