Obamacare premiums in California will increase in an average of 4.2 percent in 2015, state officials said Thursday.

Covered California, the state's health insurance exchange, announced on Thursday that it negotiated major insurers about the increase in the insurance premium.

Peter Lee, Covered California's executive director, said the new rate is low considering that other healthcare plans increase in two-digit rates.

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Lee said the current trend in healthcare cost will be beneficial for Californians because many will be able to afford it.

The positive response of Americans to Obamacare during the enrollment period from October to April was the basis of state officials and insurers for the modest 4.2 percent increase.

Robert Laszewski, a healthcare consultant in Virginia, said the actual cost of the Obamacare is not yet certain because there are still a lot of factors to be considered.

Also, for the first three years of implementation, insurance companies are subsidized by the government, so the cost of Obamacare cannot be ascertained, Laszewski said.

Dave Jones, insurance commissioner of California, said that the moderate premium increase is beneficial for policy holders but it was just a result of Proposition 45, a state statute that requires insurance companies to justify their rates to the public initiative.

Jones said the modest premium hike may just be temporary break in the previous double-digit increases practiced before.

The U.S. healthcare law have encountered challenges in recent weeks, but the minimum rate increase for the Obamacare premium is promising for Americans, according to Jones.

From a 22 percentage of Californians who do not have insurance in 2013, as of June 2014 it went down to 11 percent.

Covered California said that since the launch of Obamacare, 1.2 million California residents have enrolled during the initial sign-up period alone,  which makes up 15 percent of all the people who signed up in the United States.

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