Kejriwal asked Delhi residents not to pay "illegal" power and water bills, promising that any legal action against them would be revoked once his party comes to power in the city.
"From today, we are beginning this fast. From today, I am not going to pay my water and power bills. These are illegal and fake bills. The Delhi government is hand in glove with discoms," he said.
Kejriwal earlier had announced that his family residing in Uttar Pradesh will not pay the bills in solidarity with the protest.
"The aim of my fast is to rally more and more people against the illegal bills. If I fast, then people will get encouraged. This time we are not asking anything from the government, this time I appeal to Delhiites not to pay bills," he said.
Kejriwal said if more and more people join the "civil disobedience" movement, government and the discoms won't take against against them.
AAP National spokesperson Manish Sisodia said there are protests in 264 other places in the capital.