Comcast’s usage caps are back for customers in three states.

Comcast has decided usage caps are in the future for more of its broadband customers.

Effective Sept. 1 XFINITY Internet Service will be capped to 300GB of monthly usage in central Kentucky, Savannah, Ga., and Jackson, Miss. Comcast says the plan provides “additional choice and flexibility.”

We’re uncertain how it does that, exactly.

Comcast will have the additional choice of slapping a $10 overlimit fee for allowance offenders for every extra 50GB of data consumed.

But the company says it will be initially flexible in how it penalizes those heavy users.

“In order for our customers to get accustomed to the new data usage plan, we will be implementing a program that gives you three courtesy months for exceeding the 300GB in any 12-month period,” writes Comcast in a new FAQ. “That means you will only be subject to overage charges if you exceed the 300GB for a fourth time in a 12-month period. On the fourth (and any subsequent occurrence), you will be notified that you have exceeded your 300GB via an email and in-browser notification, that an additional 50GB has automatically been allocated to your account, and that applicable charges will be applied to your bill.”

Choice and flexibility for the customer or Comcast’s bottom line?

Customers with questions and concerns about Comcast’s expanding Internet Overcharging scheme can call Comcast Customer Security Assurance at 1-877-807-6581. Customers might want to assure Comcast if they are going back to usage caps, they will start shopping for a different provider. Stop the Cap! recommends customers in these areas protest the usage caps firmly and loudly.

“There are no legitimate engineering or economic justifications for these caps,” notes consumer group Free Press. “But Comcast’s new Internet Overcharging scheme and its discriminatory treatment of competitors’ video offerings do pose a grave threat to future video competition.”

And to your wallet.

Analysts have estimated that Comcast’s profit margins on broadband service are at least 80 percent or higher. In 2008, Sanford C. Bernstein & Co. analyst Craig Moffett estimated Comcast’s data margins at 80 percent, and Credit Suisse reported in fall 2010 that Comcast’s gross margins on high-speed data had grown to 93 percent.

Since withdrawing a nationwide cap of 250GB in 2012, Comcast had tested usage caps only in Nashville, Tenn., and Tucson, Ariz.

Stop the Cap! thanks reader “MrPaulAR” for the news tip.