At his maiden roadshow here, Kejriwal claimed he was in possession of a letter purportedly written by Modi recently to the Centre, asking for such a hike.
"The motive behind hike in prices of gas by three times was to extend benefit to Ambani as he owns wells of oil," he said adding that "by hiking gas prices the cost of fertilisers too will increase and this will lead to inflation and ultimately Ambani will be benefited."
Kejriwal took a dig at both BJP and Congress accusing them of working for Ambani.
"Both Modi and Rahul use aircraft of Ambani to travel... they extend benefits to Ambani," he said.
Sharpening his attack against Ambani, he claimed that the industrialist funded both Modi and Rahul during polls.
Hitting out at the BJP's prime ministerial candidate, he said that there was no Modi wave in the country.
"I have travelled several places...I didn't see Modi wave ...This illusion is a creation of media," he said.
He also accused Haryana Chief Minister Bhupinder Singh Hooda of "acquiring lands of poor farmers" and giving it to Ambani and Vadra (son-in-law Sonia Gandhi).
"I raised the land scandal involving Vadra 18 months back," he said questioning as to why BJP refrained from raking up the issue.
Hooda government was in news last year for alleged allotment of land in upscale regions of the state, including Gurgaon, favouring Vadra.
