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NEW YORK — America’s power grid is like an old car.

It gets the job done, even if its performance is slipping. But the repair bills go up every year, and experts say only a major overhaul will reverse its decline.

An Associated Press analysis of utility spending and reliability nationwide found that electric customers are spending 43 percent more than they did in 2002 to build and maintain local electric infrastructure. Since then, power outages have remained infrequent; but when the lights do go out, it now takes longer to get them back on.

Neither the spending nor the reliability trends are dramatic on their own. But experts say the combination is revealing: It suggests that the extra money from electric customers isn’t being spent wisely — or that utilities aren’t investing nearly enough to upgrade fragile equipment that is increasingly threatened by major storms.

“The electric system is the critical linchpin of our society, and we are operating the overall system closer to the edge,” said Massoud Amin, a grid-security expert and professor of electrical and computer engineering at the University of Minnesota.

The diminishing returns on investment reflect several trends:

• The grid is getting old, making it more expensive to maintain service at current levels of reliability.

• Day-to-day weather and major storms have become more extreme, meaning wires, poles and transformers have to be replaced more frequently.

• When utilities replace aging or broken equipment, they are not always upgrading to modern technologies common in other industrialized nations.

Expenses passed on

When utilities spend on equipment, regulators allow the companies to pass those expenses on to customers. In recent years, this portion of customer bills — the cost of delivering power — has been rising, pushing bills higher even though the cost of the power itself has fallen dramatically.

With the help of Ventyx, a software- and data-services firm that works with electric utilities, and the utility consulting firm PA Consulting Group, The Associated Press compared reliability statistics with the spending of 210 utilities across 24 categories of local distribution equipment.

In 2011, the most recent year for which annual data are available, the average U.S. electric customer was without power for 112 minutes, according to PA Consulting. That’s a 15 percent increase since 2002 and the highest level in 10 years.

The number of outages decreased slightly, from an average of 1.2 per year to an average of 1.1, but that statistic has shown no improvement since 2004.

Over that same period, annual spending per customer on local distribution equipment and maintenance rose about twice as fast as the rate of inflation, from $163 to $232, according to Ventyx. That does not include spending on power plants or major transmission lines.

The number of outages and added time needed to restore power doesn’t take into account major blackouts such as the recent Northeast blizzard or last year’s Superstorm Sandy.

The grid — an interconnected web of power plants, substations, transformers and wires spanning the continent — is often described as the world’s biggest machine. Within it, there are three major regional grids — Western, Eastern and Texas. And within those are thousands of local grids controlled by hundreds of different companies.

Because of this, and because U.S. geography is so diverse, reliability varies wildly.

In parts of the West, where vegetation is sparse and thunderstorms are rare, outages can be extremely rare, too.

In dense urban environments, where power lines are underground, customers can go years without losing power.

Frequent failures

In much of the Northeast and Southeast, where storms are common and vegetation is dense, customers often must survive without power for a few days every year.

Overall, the nation’s reliability improved steadily from the 1950s through the middle of the 1990s as utilities installed automatic switches that prevented small failures from affecting large numbers of customers, according to Mark McGranaghan, vice president of power delivery at the Electric Power Research Institute (EPRI).

Then reliability leveled off. Utilities and regulators, having reached a relatively high level of service, turned their attention away from the grid. From 1994 through 1998, spending on local grid equipment shrank. It then started to rise slowly.

Despite the higher levels of spending over the past decade, service is getting no better, and evidence is mounting that it may be getting worse.

Experts say this is a sign that the grid is less stable and in need of significantly more — and smarter — investment.

Every day, 500,000 Americans lose power for an hour or more, said Amin, the grid-security expert. Outages cost the economy $80 billion to $188 billion per year.

Old systems

Across the country, some utilities don’t know if a customer has lost power unless that person calls to complain. Many utilities still rely on paper maps of their systems that become outdated quickly. In short, they struggle to find and repair problems.

Smart grids have sensors that can sniff out problems with equipment even before it fails, offering a chance to make repairs before an outage.

But the old analog equipment has worked well enough for decades.

“From the utility’s perspective, the safest thing they can do to get their money is to do what they’ve always done,” said Rich Sedano, who directs a nonprofit advisory group called the Regulatory Assistance Project.

Promoters of the smart devices say the new technology, if implemented, could lead to a wave of improvements the same way automatic switches strengthened reliability beginning in the 1950s.

Jay Apt, a professor at Carnegie Mellon University and director of the school’s Electricity Industry Center, said money could be better spent ensuring that communities can function better when the power goes out, such as backup power equipment in mass-transit systems and in apartment buildings.

But whether it’s better to protect the grid or help customers endure blackouts, it all still costs money that nobody wants to spend.

“Every time you put a rate increase through,” said Seth Hulkower, a former Long Island Power Authority executive, “customers go crazy.”