The $3 Billion Plan to Turn Hoover Dam Into a Giant Battery

.. Now it is the focus of a distinctly 21st-century challenge: turning the dam into a vast reservoir of excess electricity, fed by the solar farms and wind turbines that represent the power sources of the future.

.. wants to equip it with a $3 billion pipeline and a pump station powered by solar and wind energy. The pump station, downstream, would help regulate the water flow through the dam’s generators, sending water back to the top to help manage electricity at times of peak demand.

The net result would be a kind of energy storage — performing much the same function as the giant lithium-ion batteries being developed to absorb and release power.

.. The Hoover Dam project may help answer a looming question for the energy industry: how to come up with affordable and efficient power storage
.. when solar and wind farms produce more electricity than consumers need, California utilities have had to find ways to get rid of it — including giving it away to other states — or risk overloading the electric grid and causing blackouts.
.. The target for completion is 2028, and some say the effort could inspire similar innovations at other dams.
.. Using Hoover Dam to help manage the electricity grid has been mentioned informally over the last 15 years. But no one pursued the idea seriously until about a year ago, as California began grappling with the need to better manage its soaring alternative-electricity production — part of weaning itself from coal-fired and nuclear power plants.
.. estimated that utility-scale lithium-ion batteries cost 26 cents a kilowatt-hour, compared with 15 cents for a pumped-storage hydroelectric project. The typical household pays about 12.5 cents a kilowatt-hour for electricity.
.. engineers propose building a pump station about 20 miles downstream from the main reservoir, Lake Mead
.. “Hoover Dam is ideal for this,” said Kelly Sanders, an assistant professor of civil and environmental engineering at the University of Southern California. “It’s a gigantic plant. We don’t have anything on the horizon as far as batteries of that magnitude.”
.. “With lithium-ion batteries, you have durability issues,” Mr. Narayan said. “If they last five to 10 years, that would be a stretch, especially because we expect to use these facilities at full capacity. It has to be 10 times more durable than it is today.”
.. its proposal would increase the productivity of the dam, which operates at just 20 percent of its potential, to avoid releasing too much water at once and flooding towns downstream.

A Bigger Problem Than ISIS?

The Mosul Dam is failing. A breach would cause a colossal wave that could kill as many as a million and a half people.

 For a statement written by diplomats, it is extraordinarily blunt. “Mosul Dam faces a serious and unprecedented risk of catastrophic failure with little warning,” it said. Soon afterward, the United Nations released its own warning, predicting that “hundreds of thousands of people could be killed” if the dam failed. Iraq’s leaders, apparently fearful of public reaction, have refused to acknowledge the extent of the danger. But Alwash told me that nearly everyone outside the Iraqi government who has examined the dam believes that time is running out: in the spring, snowmelt flows into the Tigris, putting immense pressure on the retaining wall.
.. If the dam ruptured, it would likely cause a catastrophe of Biblical proportions, loosing a wave as high as a hundred feet that would roll down the Tigris, swallowing everything in its path for more than a hundred miles. Large parts of Mosul would be submerged in less than three hours. Along the riverbanks, towns and cities containing the heart of Iraq’s population would be flooded; in four days, a wave as high as sixteen feet would crash into Baghdad, a city of six million people. “If there is a breach in the dam, there will be no warning,” Alwash said. “It’s a nuclear bomb with an unpredictable fuse.”
.. successive teams of geologists reached the same conclusion: no matter where they looked, the prevalence of gypsum would make maintaining a dam difficult.
.. “The engineers wanted to show Saddam that they could build something huge,”
.. Iraq’s leaders feared that they were due for another flood, which would strand the Army. “It was of the utmost importance to begin construction of the dam as quickly as possible,”
.. Nasrat Adamo, a former senior official at the Iraqi Ministry of Irrigation, told me that a consortium of Swiss firms hired to oversee the process assured government officials that the gypsum problem could be managed. “We listened to the top experts,” he said. “Everybody agreed that this would not be too serious.”
.. the Iraqis should have been more cautious: the Swiss explained clearly that the site was problematic, and geologists working in the area had raised concerns for decades. They also noted that Soviet and French companies bidding on the project had asked for further surveys and been told that there wasn’t time. Iraqi officials were terrified of disappointing Saddam. Adamo told me that the Minister of Irrigation feared for his life: “If the dam failed, he would be hanged.”
.. Today, a stone memorial on top of the dam commemorates nineteen Chinese nationals who died during its construction; the memorial, inscribed in English and Chinese but not in Arabic, does not give the cause of their deaths.
.. Iraqi officials rushed to build a second dam, near a town called Badush, which could help prevent flooding in case the Mosul Dam collapsed. By 1990, just six years later, the new dam was forty per cent complete. Then Saddam sent his Army into Kuwait, sparking the Gulf War, and he ordered all the earthmoving equipment stripped from the Badush site and sent to the front lines. When the United States and its allies arrived to expel the Iraqis from Kuwait, they bombed all the equipment. After the war, inspectors from the International Atomic Energy Association discovered stockpiles of nuclear materials near Badush, apparently part of Saddam’s secret weapons program. The U.N. imposed economic sanctions on Iraq, impoverishing the country for a decade. Work on Badush never resumed.
.. “In terms of internal erosion potential of the foundation, Mosul Dam is the most dangerous dam in the world,”
.. A senior American official who has spent years working in Iraq confided that the deal may have stalled after Trevi refused an Iraqi demand for a kickback.
.. Mohsen al-Shammari, then the Minister for Water Resources, told reporters that there was no chance that the dam would collapse: “Whoever is saying it’s about to collapse is only talking.” Shammari is a follower of Moqtada al-Sadr
.. In private, some Iraqis pose conspiracy theories. “I know a lot of Iraqis who think this is just a big psyops operation by the U.S. government—senior officials, not just Iraqis on the street,”
.. Part of the problem, he argued, is a tradition of inertia, begun during Saddam’s dictatorship, in which officials live in fear of being penalized for taking initiative. “Iraqis will ignore the problem until the day the dam collapses,” he told me. “I’ve seen it over and over and over again. If the boss says there’s no problem, then there is no problem. And the day there is a problem, it’s, like, ‘Help!’ ”
.. The potential disaster has presented American officials with a public-relations quandary: the people they are trying to help won’t publicly concede that there’s a problem.
.. “We don’t want to publicly embarrass the Iraqis,” the senior American official told me.
.. Since the dam opened, in 1984, engineers working in the gallery have pumped close to a hundred thousand tons of grout—an average of ten tons a day—into the voids below.

.. “The grouting work stopped for eighteen months.”

..

A “tsunami-like wave” would rush through Mosul, carrying away everything in its path, including bodies, buildings, cars, unexploded bombs, hazardous chemicals, and human waste. The wave would almost certainly catch most of the people trying to outrun it. Residents of Mosul, scrambling on foot and by car through a citywide traffic jam, would need to travel at least three and a half miles to survive. In less than an hour, those who remained would be under as much as sixty feet of water.

.. The wave, the Embassy’s report predicted, would move rapidly through the cities of Bayji, Tikrit, and Samarra, wiping out roads, power stations, and oil refineries; damage to the electrical grid would probably leave the entire country without power. At least two-thirds of Iraq’s wheat fields would be flooded.

.. “Less than six inches of moving water is strong enough to knock a person off his feet,”

.. Within four days, the wave would reach Baghdad, depositing as much as sixteen feet of water in many areas of the city, probably including the airport and the Green Zone, the site of government buildings and most of the embassies.

.. By the time the flood wave rolled past Baghdad and exhausted itself, as many as one and a half million people could be dead. But, some experts told me, the aftermath would prove even more harrowing. “I am not really worried about the dead—because they’re dead,” Alwash said. “What worries me is everyone else. How do you feed six million people in Baghdad when it’s flooded? How do you give them electricity? Where do they go?”

.. A third option, which has lately gained currency, is to erect a “permanent” seal of the existing dam wall—a mile-long concrete curtain dropped eight hundred feet into the earth. This would cost an estimated three billion dollars.