The Trump administration is blocking more than 150 onshore wind farms across the United States by delaying military reviews that were once considered routine, according to a leading industry trade group.

The delays, which companies said worsened significantly in recent weeks, are the latest escalation in President Trump’s efforts to stop wind power, a technology he detests. Several of the administration’s moves to thwart the construction of wind farms on land and in the ocean have been struck down by courts over the past few months.

Now the administration has held up a large number of onshore wind projects under development on private land, citing national security concerns. These wind farms typically have to undergo a review by the Pentagon before being built to ensure that their turbines won’t interfere with military radar or flight paths. In the past, those reviews have been fairly straightforward, but they have ground to a halt in recent weeks, and the Pentagon has canceled some meetings with developers.

“The Department of War is currently making it almost impossible to build a new wind project in the United States,” said Jason Grumet, chief executive of the American Clean Power Association, which represents renewable energy companies, using the administration’s preferred name for the Defense Department. “It’s a challenging moment to be blockading domestic energy,” he added, noting that demand for electricity is rising fast.

The stalled projects together would have about 30 gigawatts of electric generating capacity if they were built, Mr. Grumet said. One gigawatt can provide enough electricity for more than 300,000 homes, although wind turbines can’t produce power at all hours.

In a statement, a Pentagon spokesman said that the agency was evaluating all onshore wind projects to ensure that they do not impair national security or military operations and that it was a time-consuming process requiring coordination with different agencies.