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People playing the slot machines at Plainridge Park Casino (Staff photo by Martin Gavin)

 PLAINVILLE — For months, Penn National Gaming executives have been telling everyone to relax about declining revenue at its Plainridge Park Casino.

Revenue often dips at new casinos after an initial burst of business and then stabilizes, they repeatedly said.

Tuesday there was a glimmer of evidence that they may have been right.

The newest report on revenue at the slots parlor in Plainville showed it bumped up in January to $12.5 million, a 10 percent increase over the $11.2 million figure in December.

The figure is still below the staggering $18.1 million Plainridge took in during its first full month of operations in July, but still it was good news for the owners, Penn National.

“January revenues for Plainridge Park Casino are a good example of what we have previously suggested, which is that activity ebbs and flows after a new facility is opened and that it will be sometime before that pattern evens out,” Plainridge General Manager Lance George said in a statement.

The upturn was also good news for the state of Massachusetts.

Taxes paid to the state, including an account to promote horse racing, was $6.1 million in January, an increase of about $600,000 over December’s level, according to the state Gaming Commission.

Plainridge has now paid $49.4 million in taxes to the state since opening June 24.

The state taxes slot machine revenue at 40 percent for an account that goes to cities and towns and another 9 percent for the horse-racing development account.

Gross gaming revenue is the amount of money paid into slot machines, minus the money paid out in winnings.