From the August 29, 2017 issue of Public Power Daily
Originally published August 28, 2017
Electric utility crews, including those at public power
utilities, have been at the ready over the last few days to help
with the disaster unfolding in Houston, but so far, the
situation in the biggest city in Texas looks more like a matter
of saving lives than of getting power restored. Texas Gov. Greg
Abbott said Monday that he had activated the entire Texas
National Guard of 12,000 to help with the severe flooding caused
by Hurricane Harvey.
As of Monday, Aug. 28, 2,000 or more people had already been
rescued from floodwaters, and it was expected that many
thousands more would be forced to seek shelter. Both of
Houston’s airports were closed, as were roads, schools and
hospitals. President Trump is scheduled to visit the region on
Tuesday. Over the weekend, at least 18 counties in Texas were
declared a federal disaster area.
Brock Long, head of the Federal Emergency Management Agency,
said on Monday that he expected more than 30,000 people to need
emergency shelters. People who own boats or high-water vehicles
were asked to help with rescue efforts.
On Sunday morning, Aug. 27, Houston Mayor Sylvester Turner said
that “most major thoroughfares and their feeder roads” were
impassible.
Hurricane Harvey made landfall at Corpus Christi, Texas, on
Friday, with high winds and pounding rain, then became a
tropical storm over the weekend. But it refused to move away,
and the relentless rain has already set records and driven many
people from their homes. Roads turned into canals.
Roughly 300,000 electricity customers were out of power in the
Houston area on Monday. Those outages were mostly in the service
territories of CenterPoint, an investor-owned utility based in
Houston, and Texas AEP. A number of rural electric
cooperatives also had outages. In many cases, the outages were
in homes that were flooded, and officials said that power could
not be restored until the floodwaters subsided.
“Restoration efforts cannot begin until weather conditions
are safe and high rainfall total and flooding could extend
restoration times in many affected areas,” the Department of
Energy said in an Aug. 26 briefing on the aftermath of Hurricane
Harvey. “Before equipment in flooded areas can be reenergized,
waters will need to recede and equipment at substations will
need to dry out and be inspected for damage.”
The Electric Reliability Council of Texas late in the day
Aug. 28 said that the ERCOT grid continues to be in stable
condition following Hurricane Harvey. However, several
transmission lines remain out of service, especially near Corpus
Christi and Victoria where Hurricane Harvey made landfall, the
grid operator said on a
webpage that
provides updates on the hurricane and its impact on the grid.
ERCOT reported that two major 345-kV transmission lines
serving the Gulf Coast area were still out of service, along
with many other high-voltage transmission lines. As of mid-day
Aug. 28, a little more than 6,700 megawatts of generation
capacity, including a very small percentage of renewables, were
offline for reasons related to the storm.
Electricity demand in the days since landfall has been about
20,000 MW below typical August electricity use, peaking at less
than 44,000 MW, due to a combination of structural damage along
the coast and cooler temperatures in much of the region, the
grid operator said.
"ERCOT operations will continue to focus on overall grid
reliability during the restoration process, while transmission
and distribution providers make repairs to power lines and
electrical equipment. Additional engineers have been on site
around the clock throughout the hurricane and tropical storm to
support these operations and stay in constant communication with
transmission and generation suppliers," ERCOT went on to say.
It said that system restoration times will vary depending on
the extent of damage and location of the outage, as well as
weather conditions in the coming days.
Public power utilities finish restoring power
For the most part, public power utilities were spared the full
impact of Hurricane Harvey, said Walt Baum, executive director
of the Texas Public Power Association, in an Aug. 28 interview
with the American Public Power Association. TPPA is based in
Austin, Texas.
Robstown, a city-owned utility that was in the storm’s direct
path, was hit by strong winds, but had 95 percent of its
customers back by Sunday evening, Baum said. The City of Cuero,
which serves about 3,500 meters, had lost 1,000 of its customers
because of the storm, but by Monday had pared that number down
to 300, he said.
CPS Energy of San Antonio had 35,000 outages over the weekend,
and had restored power to everyone by Monday, Baum said. Austin
Energy had about 25,000 outages, and was still working to
restore power to roughly 4,000, he said.
“We’ve been very impressed with the outreach from APPA, and from
municipal systems throughout the country,” who have expressed
eagerness to help their fellow utilities, Baum said. As of
Monday afternoon, there was no need for mutual aid crews, he
said.
APPA’s Mutual Aid Program was activated on Friday, said Mike
Hyland, the Association's senior vice president for engineering
services.
“The response from the national public power mutual aid
network is amazing," Hyland said. "We hold daily calls with the
affected utilities inside the Harvey footprint, and we use that
information to inform our federal partners" at the Department of
Energy, Department of Homeland Security and FEMA, he said.
"Having this ‘boots on the ground’ understanding of the
issues facing our members in the impacted area is critical to
the Mutual Aid Program success.”
Weather service: ‘all impacts unknown’
The National Weather Service said that 30 inches of rain or more
had fallen already in some places in the Houston area, and that
another 20 inches of rain or more could be on the way over the
next few days, for a potential total of 50 inches.
“This event is unprecedented & all impacts are unknown and
beyond anything experienced,” the weather service said in a
tweet.
We are seeing catastrophic flooding, and this will likely expand
and it will likely persist as it’s slow to recede,” Louis W.
Uccellini, the NWS director, said Monday morning.
“You could not draw this forecast up,” FEMA chief Long said at
the briefing. “You could not dream this forecast up.”
Houston residents were asked not to call the overburdened 911
number unless they either needed immediate medical attention or
needed to be evacuated. They also were urged not to take refuge
in attics, if flood waters rose, but rather to go to their
rooftops where they could be seen. Chopping a hole in the roof
with an axe became a safety measure.
“When escaping flood waters in your home DO NOT get trapped in
your attic,” the National Weather Service tweeted. “Get on the
roof and call 911.”
The Army Corps of Engineers began releasing water from two
reservoirs west of Houston because the dams were under too much
pressure.
“A flood of this magnitude is an 800-year event and it exceeds
the design specifications of our levees,” said County Judge
Robert Hebert.
NERC: Bulk power system ‘stable’
The North American Electric Reliability Council, or NERC, issued
a statement on Aug. 28 saying that although there have been
“some generation and transmission outages, the bulk power system
has remained stable throughout this devastating, long-lasting
storm.”
“We recognize that distribution systems in southeast Texas have
been greatly impacted and utilities are coordinating with
federal officials to restore power when and where possible, as
ongoing rain and flooding creates a hazardous restoration
environment,” NERC said. “Ensuring safety is a top priority as
crews work to assess damage and restore power as quickly and
safely as possible.”
NERC noted that the Department of Energy is issuing situation
reports based on restoration activities that can be found on
the Office of Electricity Delivery and Energy Reliability
webpage.
Worries about flooding in Louisiana
In Texas and in Louisiana, those living near rivers kept a
nervous eye on rainfall forecasts and river levels. On Monday,
President Trump declared “emergency conditions” in Louisiana.
“Flooding is the major concern,” said Greg Labbe, transmission
and distribution operations supervisor for the Lafayette Utility
System in Lafayette, Louisiana, in an Aug. 28 interview with the
American Public Power Association.
As of midday on Monday, LUS has had only a few outages, Labbe
said.
“We’ve been lucky so far,” he said.
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