Made in Cardiff has today become the eighth local TV station to go live.
It follows the launch earlier this month of Made in Bristol.
Some 28 local TV licences have been awarded by Ofcom over the last couple of years under the government scheme.
And Made in Cardiff today joins stations for Grimsby (November 2013), Norwich (March), London (March), Nottingham (May), Glasgow (June), Brighton (August) and Bristol (October) in launching.
Made in Cardiff station manager Bryn Roberts said: "The buzz around our launch is growing as more and more people hear about it and we cannot wait to show people what we can offer. My plan is for this time next year,
everyone in Cardiff will have either been on one of our shows or know someone who has been."
The station said it will be working from the Wales capital's centre and has employed "around 20 full-time staff".
Made in Cardiff news editor, Jeff Collins – formerly of ITN, Sky and the BBC – said: "We can be successful because we are bringing something different to the table. ITV and BBC Wales have to cater for the whole nation. Their agenda is different to ours. It must reach out and touch people in north, south, east and west Wales. The difference with Made In Cardiff is that we will totally focus on Cardiff. Viewers in the city will be able to see what's going on it their home town."
Shows to be broadcast by the station include "What's Occurin'", a magazine show compared to the One Show, cookery show Turning Tables, various sports programmes, a chat show and an interview programme called 1-2-1.
Made in Cardiff is one of several stations part of the Made TV group. Made in Bristol went live on 8 October, and stations for Leeds and Tyne and Wear are expected to launch next month.
Made TV has said its network will cover more than 11m people by the end of November.
As well as Made in Cardiff being available on freeview channel 23 in the area, it launches on Virgin channel 159 on 21 October and Sky channel 134 on 24 November. It also has an online catch-up service.