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US Energy Secretary Ernest Moniz has stressed that there is much work to do to modernise the nation's outdated system for moving oil, natural gas and power.

"It is the right time, maybe it's a little after the right time, for us to make these kind of investments in energy infrastructure," Moniz said.

Nationwide, new pipelines must be built, old ones repaired and electric grids and transformers insulated from storms and terrorist attacks.

Those urgent needs are spotlighted in the government's first quadrennial energy review (QER), a sprawling, nearly 500 page analysis released last week that offers a US$15 billion road map for updating US energy infrastructure and making it more resilient against man-made and natural threats.

America黑料社檚 natural gas pipelines in particular are a critical weak link in the nation黑料社檚 sprawling electric grid, Moniz also said.

黑料社淭he natural gas system, the distribution pipes, are a big issue,黑料社� Moniz said, speaking at a breakfast hosted by the Christian Science Monitor. 黑料社淎bout half of the distribution pipes in the country are 50 years old or older, so that黑料社檚 a very obvious area.黑料社�

High-volume transmission pipelines, which carry gas from wells to refineries and storage facilities, remain 黑料社渦nderutilised黑料社� and still have room to spare, Moniz said, but smaller distribution lines 黑料社� which carry gas to customers 黑料社� are ageing and at capacity, harming the environment and putting consumers at risk of explosions.

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