The public authorities that run New York’s mass transit, toll highways, power plants and more are opening up since a landmark accountability law took effect this year, yet concerns remain about no-bid contracts and protection for whistle blowers.

The head of the state authorities budget office, David Kidera, told an Assembly committee Monday that many of the measures required by the law as of March 1 are in place.

But he said not all state and local authorities have policies yet to protect whistle blowers who report corruption and waste. There’s also a question about the legality of numerous no-bid contracts worth millions of dollars.

Assemblyman Richard Brodsky said it’s a rough start for the law enacted after decades of scandal in some of the authorities which were investigated for waste while raising tolls and fares and political corruption.

“This is a major shake-up in a system that needed a shake-up and it’s off to a bumpy start,” said Brodsky, a Westchester Democrat who sponsored the bill five years in the making. “We had a cautionary note today.”

The law requires the Metropolitan Transportation Authority, the Thruway Authority and hundreds of other entities to open their books for independent audits. It also makes board members accountable to their authority and the public, rather than the governors and mayors who appoint them. Critics have called authorities a shadow government, with too little accountability to the public.

“I think that it’s a very positive improvement over the former law,” Kidera said. He reported that several of the accountability measures required by the law will be implemented in coming months.

Brodsky is seeking the Democratic nomination for attorney general with several other candidates, including former Insurance Superintendent Eric Dinallo, Sen. Eric Schneiderman of Manhattan, and Nassau County District Attorney Kathleen Rice.