Severe weather is the leading cause of major power outages across the United States, according to an Associated Press analysis of industry data.
About 130,000 Public Service Company of Oklahoma customers experienced power outages at some point during the recent post-Christmas winter storm, PSO spokesman Stan Whiteford said this week.
The majority of the outages were concentrated in western Oklahoma, the portion of the state hit the hardest by icy conditions. But outages affected approximately 27,000 across the Tulsa area and rest of the state during the weather event as well.
Oklahomans were affected by 25 reports of power incidents and outages between 2002 and 2013, according to a federal database that tracks electric disturbance events across the country.
Of the disturbance events listed, the majority were weather-related.
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Looking at the data in terms of the number of customers affected, the two most severe were ice storms. The top event was a Jan. 30, 2002, storm that data says knocked out power to 1,881,134 Oklahoma Gas & Electric customers. An ice storm that hit Tulsa on Dec. 10, 2007, left a total of 256,663 PSO customers without electricity, data show. Service wasn’t restored for everyone until more than a week later on Dec. 19, data show.
Of course, weather-related outages aren’t unique to Oklahoma, or its utility providers. The number of weather-related power outages has climbed over the last decade, with the greatest spikes in 2008 and 2011, according to the AP analysis and independent studies.
When Hurricane Katrina’s punishing storm surge plowed ashore, it swamped seven of Coast Electric Power Association’s substations, vital to powering thousands of Mississippi homes and businesses. The facilities have long since been repaired, but a decade after the storm they remain at the same elevation, and just as vulnerable to catastrophic hurricanes.
That leaves Coast Electric and other utilities across the country struggling to balance customer costs with the need for improvements to counter the rising number of violent storms, floods and droughts threatening the U.S. power grid’s core infrastructure.
Katrina damage: The eye of Katrina ripped through the coastal city of Waveland in late August 2005, leveling neighborhoods, destroying infrastructure and knocking out power to Coast Electric’s entire coverage area.
Facing sweltering summer heat and $110 million in damage, the small nonprofit cooperative focused on restoring power to customers as quickly as possible, said vice president of engineering Scott Brown. The old substations that flooded were repaired to pre-storm conditions — at the time, it would have been impractical to raise them or move them elsewhere.
“We’re only a few feet above sea level right here,” Brown said during a recent visit to a Waveland substation.
Coast Electric was able to make some major improvements post-Katrina; it used a large mound of dirt to elevate a new substation 18 feet above sea level. But raising the old substations that flooded would cost Coast’s 68,160 customers millions of dollars, Brown said.
Hundreds of companies own and manage the equipment that makes up the U.S. power grid. They range from large investor-owned companies like New York’s Consolidated Edison to small municipal utilities and cooperatives like Coast Electric, and each faces a unique set of challenges.
When Hurricane Irene hit the Northeast in 2011, it marked the first time in the history of Con Ed that more than 200,000 customers lost power from a storm. Superstorm Sandy struck just 14 months later, quickly followed by a devastating Nor’easter, leaving 1.1 million customers in the dark.
“It was clear to us that weather patterns were changing fundamentally. Severe weather events were becoming more frequent and devastating,” Allan Drury, a Con Ed spokesman, said in an email.
Con Ed is spending $1 billion to harden its system. Drury said the utility has been able to afford all the upgrades it wants.
The test will be when the next powerful storm hits.
Expensive outages: There’s no doubt that improvements are costly for utilities and the customers they serve, but so are outages. A 2013 report by the White House said weather-related blackouts cost the U.S. economy an annual average of $18 billion to $33 billion, when adjusted for inflation, from 2003 to 2012.
They can also be deadly. The report said 50 deaths in the aftermath of Sandy were attributed to power outages, including senior citizens who died from hypothermia and others poisoned by carbon monoxide from generators.
There are funds available from the Federal Emergency Management Agency to help utilities rebuild after catastrophes. The Mississippi cooperative received about $100 million in FEMA public assistance grants, but the money allowed it only to repair the flooded substations to pre-storm conditions.
FEMA offered more funds that would have been used to raise the flooded substations, but the co-op did not apply — cost effectiveness assessments and environmental considerations would have taken too much time, Brown said, and would have delayed getting the lights back on.
Once the work began, Coast Electric could not change the terms of the grant to improve the sites, Brown said. So the seven substations swamped by Katrina were built back at the same elevation — at a time when scientists were already warning of rising sea levels and the threat of more frequent and extreme severe weather.
A study published in the journal Risk Analysis in May found that the U.S. power grid is increasingly blacking out when hit with severe weather, and lags behind other developed nations in terms of reliability.
“I think it is an open question as to whether utilities are investing enough in the infrastructure needed to harden the system against storms, and on simple but effective things like tree trimming,” said Roshanak Nateghi, the report’s lead author and a professor at Purdue University.
Last year, regulators in drought-stricken California ordered the state’s investor-owned utilities to set priorities for inspecting and removing dead and sick trees near their power lines, warning that “climate change has facilitated and exacerbated numerous wildfires” that have damaged and threatened their facilities. Utilities could ask the California Public Utilities Commission for additional funds to address wildfire threats, regulators said.
But after a wildfire killed two people, destroyed 475 homes and scorched 70,000 acres in the tinder-dry Sierra Nevada foothills in September, homeowners and their attorneys are asking whether San Francisco-based Pacific Gas & Electric Co. did enough to clear dry trees flanking its power lines.
PG&E spokesman Joe Molica said the company had spent $260 million to prepare for extreme weather and drought. This year alone, he said, PG&E hired 350 arborists and 19 foresters to inspect and remove dead trees and brush near the utility’s 134,000 miles of lines, and also bought cameras for fire lookout towers and funded rural fire safe councils.
State fire officials are still investigating the cause of the blaze, which officials recently said was the second-most devastating fire in a drought year that so far has seen more than 6,000 wildfires, about one-third more than the recent average.
Repairs and reinforcements: Data detailing the amount repairs following severe weather events in Oklahoma have cost PSO wasn’t available Thursday, but Whiteford said the totals the utility company spends responding to some weather events can climb into the millions.
Whiteford said PSO also does what it refers to as “system hardening” on a regular basis where it makes infrastructure upgrades like replacing wooden structures with steel structures.
OG&E spokeswoman Kathleen O’Shea said following the December 2007 ice storm the energy corporation developed a circuit hardening program in cooperation with the Oklahoma Corporation Commission. The program was a response to the extensive damage and long outage times caused by the ice storm.
The circuit-hardening process consisted primarily of bringing distribution circuits up to current standards by replacing wood pins arms with steel pin arms and replacing open-wire service drops with wrapped cable, she said. It also included strengthening support structures such as poles and guy wires, and replacing conductors.
The program hardened 103 circuits, directly affecting more than 100,000 customers over 700 route miles of distribution lines, O’Shea said. The circuit hardening program cost approximately $45.4 million and took 4½ years to complete.
Lack of data: Nationally, fragmented data collection makes it difficult to gauge whether utilities have adequately hardened their systems against more extreme weather. Many companies are not required to provide regulators with data related to how often outages occur or how long they last.
AP largely adopted the methodology used by independent research organization Climate Central to chart the latest growth in the number of weather-related outages. Climate Central’s previous study, spanning 2003 to 2012, found weather-related outages were becoming much more frequent.
In a study published in August, researchers at Lawrence Berkeley National Laboratory and Stanford University surveyed a sample of 195 utilities and found that from 2000 to 2012, increasingly severe weather was tied to longer-lasting outages.
Utilities spent $20.1 billion in 2012 to upgrade their distribution infrastructure, but even so, the number of minutes that customers have been without power has been on the rise, researchers found.
“A significant number of the minutes that customers experience having their lights out are still the result of big storms,” said Joseph Eto, the lead author and researcher at Lawrence Berkeley National Laboratory.
World Business Writer Casey Smith contributed to this report.