Donations to the National Party from coal seam gas companies have risen tenfold in four years, but the party is not required to disclose the majority of donations it receives from the gas industry under electoral funding laws.

In the past two years, the Nationals accepted more than $25,000 from Santos, the company that wants to supply a quarter of NSW's gas needs through CSG.

Political funding figures released by the Australian Electoral Commission on Monday show the Nationals also got donations from Queensland-based Arrow Energy, Chevron and the industry's peak body, the Australian Petroleum Production and Exploration Association, totalling nearly $95,000.

In the previous two years, the oil and gas industry had donated just $4950 in total.