An Arizona official is threatening to cut off Los Angeles' electricity supply in response to a proposed boycott over the state's new immigration law.

The Los Angeles City Council voted last week to boycott Arizona by suspending official travel there and ending future contracts with state businesses.

The boycott requires approval from L.A. Mayor Antonio Villaraigosa, who has already said he supports it.

Gary Pierce, a commissioner on the five-member Arizona Corporation Commission, wrote a letter in response to the decision, ridiculing Villaraigosa.

"I received your message; please receive mine. As a statewide elected member of the Arizona Corporation Commission overseeing Arizona's electric and water utilities, I too am keenly aware of the 'resources and ties' we share with the city of Los Angeles," Pierce wrote.

He continues to say that approximately 25-percent of the electricity consumed in Los Angeles is generated by Arizona power plants.

"If an economic boycott is truly what you desire, I will be happy to encourage Arizona utilities to renegotiate your power agreements so Los Angeles no longer receives any power from Arizona-based generation. I am confident that Arizona's utilities would be happy to take those electrons off your hands," Pierce wrote. "If, however, you find that the City Council lacks the strength of its convictions to turn off the lights in Los Angeles and boycott Arizona power, please reconsider the wisdom of attempting to harm Arizona's economy."

Pierce has said he was speaking for himself and not the entire commission.

SB 1070 makes it a crime for illegal immigrants to be in Arizona and requires police to check immigration papers during investigation of a crime. Critics contend the law will lead to racial profiling.

The boycott would involve suspending travel to the state, avoiding new contracts and reviewing current contracts for possible termination.

The city has about $52 million in investments with Arizona, including contracts for airport, harbor and trucking services.

However, only about $7 to $8 million in contracts would probably be affected, according to Councilwoman Janice Hahn, who co-authored the resolution with Ed Reyes.

"We will be asking to terminate contracts that we currently have with businesses in Arizona and restrict travel of city staff to Arizona," Hahn told KTLA.

Hahn also encouraged Angelenos to refrain from traveling to Arizona for vacation or business, if at all possible.

"We want to send a strong message that we think the law they just passed is discriminatory, it's wrong and it's not the answer to the immigration problem that we have in this country," she said.

Hahn conceded that some deals with Arizona would be impossible to cancel.

"US Airways is based in Arizona and they certainly fly in and out of Los Angeles," she said. "It would be infeasible to end those flights."

West Hollywood, Oakland, San Diego and San Francisco have already passed resolutions to boycott Arizona.

The Harbor Department and Los Angeles World Airports have expressed concern about possible termination of their contracts with Arizona businesses.

The Harbor Department has four contracts with Arizona firms worth a total of $25.6 million, mostly involving a clean truck incentive program.

"The program has been phenomenally successful," said Arley Baker, a port spokesman. "We don't recommend rescinding the contracts due to adverse effects on the environment and public health."

Los Angeles World Airports has three equipment and maintenance contracts worth $77,000 and receives $22 million in revenue from two Arizona-based airlines -- US Airways and Mesa Air.

The Los Angeles Department of Water and Power is researching how the boycott would affect its operations. The city has wind farm and nuclear energy contracts in Arizona, but it wasn't immediately clear how much the contracts were worth or how much energy those companies provide to Los Angeles.

Lawmakers hope they could turn around and give the canceled contracts to California suppliers.