The Biden administration announced Wednesday that it is providing $600 million in funding to produce new at-home COVID-19 tests and is restarting a website allowing Americans to again order up to four free tests per household — aiming to prevent possible shortages during a rise in coronavirus cases that has typically come during colder months.

The Department of Health and Human Services says orders can be placed at COVIDTests.gov starting Sept. 25, and that no-cost tests will be delivered for free by the United States Postal Service.

The tests are designed to detect COVID variants currently circulating, and are intended for use by the end of the year. But they will include instructions on how to verify extended expiration dates, the department said.

Dawn O’Connell, assistant secretary for preparedness and response at HHS, said that though some portions of the public may be tired of the pandemic and its implications, at home-testing remains a key way to slow the spread of new cases.

“Whether or not people are done with it, we know the virus is there, we know that it’s circulating. We know, if past is prologue, it’ll circulate to a higher degree and spread, and cases will go up in the fall and winter seasons,” said Dawn O’Connell, assistant secretary for preparedness and response at HHS. “Anticipating that that would be true again, or something similar, we want to make sure the American people have these tools.”

O’Connell said the website will remain functional to receive orders through the holidays and “we reserve the right to keep it open even longer if we’re starting to see an increase in cases.”

“If there is a demand for these tests, we want to make sure that they’re made available to the American people for free in this way,” O’Connell said. “But, at this point, our focus is getting through the holidays and making sure folks can take a test if they’re going to see Grandma for Thanksgiving.”