Michelle P. Bourg, who is responsible for transmission at Entergy’s Louisiana operations, told regulators that because it was too expensive to make the entire network resilient, Entergy pursued “targeted programs that cost effectively reduce the risks to reliability.”

In a statement, Entergy said its spending on transmission was working, noting that Ida destroyed or damaged 508 transmission structures, compared with 1,909 during Laura and 1,003 in Katrina. The company added that its annual investment in transmission in Louisiana and New Orleans has increased over the last eight years and totaled $926 million in 2020, when it spent extensively on repairs after Laura. The company spent $471 million on transmission in 2019.

“The facts of this storm support that we have made substantial progress in terms of resiliency since the storms that hit our system in the early 2000s — both generally and with respect to transmission in particular,” said Jerry Nappi, an Entergy spokesman.

The company declined to provide the age of damaged or destroyed transmission structures and an age range for the damaged distribution poles and equipment. Mr. Nappi acknowledged that distribution poles suffered widespread destruction and were not built to withstand winds of 130 to 150 m.p.h.

“Substantial additional investment will be required to mitigate hardship and avoid lengthy outages as increasingly powerful storms hit with increasing frequency,” he said in an email. “We are pursuing much-needed federal support for the additional hardening needed without compromising the affordability of electricity on which our customers and communities depend.”

The company’s plea for more help comes as President Biden is pushing to upgrade and expand the nation’s electricity system to address climate change as well as to harden equipment against disasters. Part of his plan includes spending tens of billions of dollars on transmission lines. Mr. Biden also wants to provide incentives for clean energy sources like solar and wind power and batteries — the kinds of improvements that community leaders in New Orleans had sought for years and that Entergy has often pushed back on.

Susan Guidry, a former member of the New Orleans City Council, said she opposed the construction of the new natural gas plant, which was located in a low-lying area near neighborhoods made up mostly of African Americans and Vietnamese Americans. Instead, she pushed for upgrades to the transmission and distribution system and more investment in solar power and batteries. The council ultimately approved Entergy’s plans for the plant over her objections.

“One of the things we argued about was that they should be upgrading transmission lines rather than building a peaking plant,” Ms. Guidry said.

In addition, she said, she called for the company to replace the wooden poles in neighborhoods with those built with stronger materials.

Robert McCullough, principal of McCullough Research, said it was hard to understand why Entergy had not upgraded towers and poles more quickly.

“Wood poles no longer have the expected lifetime in the face of climate change,” he said. “Given the repeated failures, it is going to be cost-effective to replace them with more durable options that can survive repeated Category 4 storms — including going to metal poles in many circumstances.”

Had Entergy invested more in its transmission and distribution lines and solar panels and battery systems, some green energy activists argued, the city and state would not have suffered as widespread and as long a power outage as it did after Ida.

“Entergy Louisiana needs to be held accountable for this,” said one of those activists, Logan Atkinson Burke, executive director of the Alliance for Affordable Clean Energy.

Entergy has argued that the natural gas plant was a much more affordable and reliable option for providing electricity during periods of high demand than solar panels and batteries.

Jennifer Granholm, Mr. Biden’s energy secretary, said that Ida highlighted the need for a big investment in electric grids. That might include putting more power lines serving homes and businesses under ground. Burying wires would protect them from winds, though it could make it harder to access the lines during floods.

“Clearly, as New Orleans builds back, it really does have to build back better in some areas,” Ms. Granholm said in an interview this month.

Mr. Nappi, the Entergy spokesman, said that distribution lines in some parts of New Orleans and elsewhere are already underground but that burying more of them would be expensive. “Distribution assets can be made to withstand extreme winds, through engineering or under grounding, but at significant cost and disruption to customers and to the community,” he said.

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Hurricane Ida Exposes Grid Weaknesses as New Orleans Goes Dark

Most of New Orleans went dark on Sunday after Hurricane Ida took out transmission lines and forced power plants offline. It was an all too familiar scene in a city that has often lost power during big storms.

But this was an outage that was never supposed to happen. The utility company Entergy opened a new natural gas power plant in the city last year, pledging that it would help keep the lights on — even during hot summer days and big storms. It was one of two natural gas plants commissioned in recent years in the New Orleans area, the other one hailed by Gov. John Bel Edwards last year as a “source of clean energy that gives our state a competitive advantage and helps our communities grow.”

The storm raises fresh questions about how well the energy industry has prepared for natural disasters, which many scientists believe are becoming more common because of climate change. This year, much of Texas was shrouded in darkness after a winter storm, and last summer officials in California ordered rolling blackouts during a heat wave.

More than a million residential and commercial customers in Louisiana were without power on Monday afternoon, and Entergy and other utilities serving the state said it would take days to assess the damage to their equipment and weeks to fully restore service across the state. One customer can be a family or a large business, so the number of people without power is most likely many times higher. In neighboring Mississippi, just under 100,000 customers were without power.

some of California’s largest and deadliest wildfires.

impossible for Texas to import power by keeping the state grid largely isolated from the rest of the country to avoid federal oversight.

add more transmission lines to carry more solar and wind power from one region of the country to another. But some energy experts said the increasing frequency of devastating hurricanes, wildfires and other disasters argues against a big investment in power lines and for greater investment in smaller-scale systems like rooftop solar panels and batteries. Because small systems are placed at many homes, businesses, schools and other buildings, some continue to function even when others are damaged, providing much-needed energy during and after disasters.

Susan Guidry, a former member of the New Orleans City Council who voted against the Entergy plant, said she had worried that a storm like Ida could wreak havoc on her city and its energy system. She had wanted the city and utility to consider other options. But she said her fellow Council members and the utility had ignored those warnings.

“They said that they had dealt with that problem,” Ms. Guidry said. “The bottom line is they should have instead been upgrading their transmission and investing in renewable energy.”

Numerous community groups and city leaders opposed the gas-fired power plant, which is just south of Interstate 10 and Lake Pontchartrain, bordering predominantly African American and Vietnamese American neighborhoods. Nevertheless, the City Council approved the plant, which began commercial operations in May 2020. It generates power mainly at times of peak demand.

About a year earlier, Entergy opened a larger gas power plant in nearby St. Charles Parish. Leo P. Denault, Entergy’s chairman and chief executive, last year called that plant “a significant milestone along the clean energy journey we began more than 20 years ago.”

Some utilities have turned to burying transmission lines to protect them from strong winds and storms, but Mr. Gasteiger said that was expensive and could cause its own problems.

“Generally speaking, it’s not that the utilities are not willing to do it,” he said. “It’s that people aren’t willing to pay for it. Usually it’s a cost issue. And undergrounding can make it more difficult to locate and fix” problems.

Big changes to electric grids and power plants are likely to take years, but activists and residents of New Orleans say officials should explore solutions that can be rolled out more quickly, especially as tens of thousands of people face days or weeks without electricity. Some activists want officials to put a priority on investments in rooftop solar, batteries and microgrids, which can power homes and commercial buildings even when the larger grid goes down.

“We keep walking by the solutions to keep people safe in their homes,” said Logan Atkinson Burke, executive director of the Alliance for Affordable Energy, a consumer group based in New Orleans. “When these events happen, then we’re in crisis mode because instead we’re spending billions of dollars every year now to rebuild the same system that leaves people in the dark, in a dire situation.”

Some residents have already invested in small-scale energy systems for themselves. Julie Graybill and her husband, Bob Smith, installed solar panels and batteries at their New Orleans home after Hurricane Isaac blew through Louisiana in 2012. They lost power for five days after Isaac, at times going to their car for air-conditioning with their two older dogs, said Ms. Graybill, 67, who retired from the Tulane University School of Medicine.

“We would sit in the car about every hour,” she said. “My husband said, ‘We are never doing this again.’” Mr. Smith, 73, who is also retired, worked as an engineer at Royal Dutch Shell, the oil company.

The couple have set up a little power station on their porch so neighbors can charge their phones and other items. Only a few other homes on their street have solar panels, but no one else nearby has batteries, which can store the power that panels generate and dispense it when the grid goes down.

“We’re told we’re not going to have power for three weeks,” Ms. Graybill said. “The only people who have power are people with generators or solar panels. We lived through Katrina. This is not Katrina, so we’re lucky.”

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