New York’s top energy utility regulators admitted Thursday there’s a gas shortage — even as they slammed National Grid for imposing a moratorium and denying hook-ups to new customers because of supply problems.

The acknowledgements of a shortage came during a Public Service Commission meeting where officials discussed a legal order pushed by the Cuomo administration that prodded National Grid to restore service to 1,157 customers with inactive accounts.

PSC Commissioner Diane Burman said it’s easy to blame the utility but Albany is also at fault for failing to make the tough decisions to boost the energy supply.

“The most important thing is to keep the lights on,” said Burman, who emphasized the state needs to rely on a variety of energy sources before transitioning to cleaner, renewable energy sources such as solar, wind and thermal.

“Those who say ‘no new pipelines’ should look at what the ramifications are,” Burman said.

National Grid said in May it would not approve new applications for gas service in the downstate metropolitan region until the Williams Co. $1 billion Northeast Supply Enhancement pipeline from Pennsylvania to New York receives the state permits it needs to get built. The Cuomo administration, through the state Department of Environmental Conservation, has blocked the permits.

“We’re acknowledging the need for gas,” Burman said.

Burman also warned that limited gas supplies will force utilities and customers to rely on dirtier “environmentally harmful or environmentally unfriendly” alternatives — particularly oil.

PSC Commissioner Tracy Edwards, who accused National Grid of holding customers hostage, said, “We have capacity issues.”

She said it’s still unclear how “big” the gas shortage is and whether it could be addressed with or without building a new pipeline downstate.

But she added, “I believe there is a capacity issue.”

Commissioner John Howard chimed in, “This short-term reaction was, `We need more gas.’ That’s an undeniable fact.”

In a letter to the PSC, National Grid NY president John Bruckner requested that the “Commission acknowledge the current supply constraints require a moratorium on new gas connections in the interest of public safety and, absent long-term solutions to address the current supply demand imbalance, the moratorium must remain in effect.”

Brucker also urged the PSC staff to release a long-awaited analysis of supply needs that he believes will confirm a serious gas shortage that needs to be addressed.