Contractors for the Los Angeles Department of Water and Power used ratepayer funds to pay for Las Vegas prostitutes, hotel rooms and booze, Los Angeles City Attorney Mike Feuer alleged Thursday.

In a Los Angeles County Superior Court filing, Feuer states PriceWaterhouseCoopers employees working on the DWP’s billing system engaged in a “three-year long conspiracy to defraud the City and LADWP by submitting falsified time records and invoices” from 2011 to at least 2013.

The consulting firm denied the charges Thursday, calling the city’s allegations a “crude attempt to disparage PwC.”

Feuer’s filing was made as part of the city’s ongoing lawsuit against PwC. Los Angeles officials sued the firm in 2015 for its role in working on the DWP’s new billing system. The system ultimately produced thousands of inaccurate bills, and the city lost tens of millions of dollars, according L.A. officials.

The motion filed Thursday seeks to amend the 2015 lawsuit to add allegations of fraud.

PwC and several senior-ranking PwC managers falsified and artificially inflated time cards, the filing states. The lawsuit also cites the spending of ratepayer money on the services of prostitutes and escorts, and two separate bachelor parties.

One PwC partner who led the “fraudulent billing conspiracy,” according to Feuer’s office, boasted of how ratepayers were going to pay for his own Las Vegas bachelor party. According to court filings, the man stated: “We are going to cover a lot of this trip with LADWP money.”

The filing alleges the PwC group paid for a $6,497 poolside cabana party at the Hard Rock Beach Club, and a $2,184 “bottle service” party at the Vanity Nightclub in the Hard Rock Hotel & Casino.

Daniel Thomasch, outside counsel to PwC, denied the charges made in Thursday’s filing and blasted the utility.

“PwC never submitted falsified time records to LADWP and never received a single dollar from LADWP to which it was not due,” Thomasch said. “LADWP’s amended complaint is not provoked by concerns over a subcontractor’s billing practices -– it is a crude attempt to disparage PwC because PwC has had the audacity to stand up to LADWP’s much-hyped, but baseless, lawsuit.”

The consulting firm has also denied the city’s allegations of its role in the DWP’s botched billing system rollout.