Story highlights The energy sector is facing ever-increasing cyber and physical attacks on the nation's electric grid, industry experts said

Such attacks hit the nation's electric grid once every four days, according to estimates

Washington (CNN) The energy sector is calling for improvement in notification and information sharing from the federal government in the face of ever-increasing cyber and physical attacks on the nation's electric grid, industry experts said before a House panel on Wednesday.

Such attacks hit the nation's electric grid once every four days, according to estimates, Rep. Randy Weber, a Texas Republican, said at the House Subcommittee on Research and Technology hearing. The session was focused on better protecting the nation's power grid and identifying its vulnerability to cyberattacks.

"In over 300 cases of significant cyber and physical attacks since 2011, suspects have never been identified," Weber said.

America's electric grid is being modernized through an increased use of "smart grid" technology which includes more digital IT technology. However, a more modernized system also means more interconnectivity and more access points for intruders.

Brent Stacey, an associate lab director at the Idaho National Laboratory, told lawmakers there has been a "32% increase in the number of attacks on the energy sector" and it continues to increase.

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