The "big six" energy firm blamed the hike on the increased costs of supplying electricity and defended the move, claiming it had shielded customers from rises since November 2013, but could no longer offset the cost.
The average bill cost will rise by £76 and Centrica, the owner of British Gas, has said it will give a £76 credit to more than 200,000 vulnerable customers to protect them from the increase.
Such announcements are highly sensitive because they can affect share prices.
Centrica's price increase also comes despite steep losses in customer accounts as many switch to rivals and new market entrants who often offer cheaper tariffs.
But Iain Conn, chief executive of Centrica, told the programme that while the commodity price of electricity had come down it was facing "significant cost pressure" on transmission, distribution and costs associated with Government policy.
If you don't know your energy consumption details then don't worry, the comparison sites will allow you to answer a few questions about your lifestyle to provide you with a personal estimate.
Research suggests that British Gas should be cutting bills, not putting them up, as the wholesale cost of energy has been falling.
"British Gas hasn't had a price rise for almost four years".
A spokeswoman for the Department for Business, Energy and Industrial Strategy said: "Energy firms should treat all their customers fairly and we're concerned this price rise will hit many people already on poor-value tariffs".
British Gas has installed more than 4 million smart meters so far.
The owner of British gas, Centrica, has admitted that more than three million utilities customers will be affected by this energy price hike.
Centrica noted that its direct like-for-like headcount reduced by 1,058 in the first half of 2017 and it remains on track to achieve its targeted reduction of 1,500 for the full year, which will take the total reduction since the start of 2016 to almost 5,000.
Handily, Ofgem breaks down that 15% cost increase into what has caused costs to rise.
"On the face of it, it does not appear to be justifiable at all from where the market is going", he said.
The hike will be introduced in September and will impact 3.1 million people.
In the run up to the June General Election, the Conservatives promised and energy price cap, in a supposed departure from traditional Tory liberal economics which rejects state interference in the market. This followed a government request to set out plans to help those placed on the poorest-value tariffs.
"And that means if, as is possible, we see another batch of rises this coming winter, its customers will feel like they've been price-slapped twice in rapid succession".
There is major news breaking in the world of golf this morning, as Rory McIlroy is splitting with caddy JP Fitzgerald. The 10-year partnership of Rory McIlroy and JP Fitzgerald is over after the Irishman sacked his caddie.
His rival for the striker's position, Alvaro Morata, made his first start for the club before making way during the second half. In the 53rd minute, Inter went 2-0 up thanks to Manchester United target Perisic's smart angled-finish.
The park came under increased scrutiny after the documentary "Blackfish" featured Tilikum, who killed a trainer in 2010. . SeaWorld stated attention would now turn to Takara and providing care to the rest of the orca pod.
On Aug. 21, a celestial event will occur across the continental United States , moving from the coast of OR (at 10:15 a.m. In this method, you don't look directly at the sun, but at a projection on a piece of paper or even the ground.
"I will fight every iteration of this bill on the floor that would threaten the health care for millions of Americans". The vote-a-rama will likely last into the wee hours of Friday morning, or until "people get exhausted ", said Sen.
The Oppositions act of pointing out the mistakes committed by the government is part of the democratic tradition of the country. Earlier, the house was adjourned till 2.30 p.m.as the opposition members protested against the suspension of Congress members.
Prop. 57, passed by California voters previous year , increases parole chances for felons convicted of nonviolent crimes. Nicandro and Gloria Sanchez have said they're still "numb" and don't know how to feel.
Mark Zuckerberg also announced that 250 million use Whatsapp Status every day , which, to be honest, is a bit of a surprise. A Twitter user has even posted a screenshot of the alleged recall feature on the WhatsApp Web version number 0.2.5370.
The Sims 4 , the latest entry in Electronic Arts' iconic life-simulation franchise, first debuted for the PC back in 2014. Despite featuring powerful hardware specifications, Microsoft claims the Xbox One X is its smallest console.
Schooling had admitted after the race that Reese had warned him that this would happen if he took time off from the pool. Dressel becomes the first person to win three gold medals in one day in either Worlds or Olympic competition.
Security forces stand guard outside the Israeli embassy in the residential Rabiyeh neighbourhood of the Jordanian capital Amman . Following the attack, the Israeli deputy ambassador remained in Cairo; 85 staff members and their families returned to Israel.
This was, according to Mithali, her fifth and probably final World Cup. The players were felicitated by Fadnavis at Vidhan Bhawan.
Milan has 18 rival bids to land EMA
The European Commission will assess each of the cities based on criteria approved by the 27 member states remaining in the union. The Minister for Health, Simon Harris has today claimed that Dublin is the ideal new home for the European Medicines Agency .
Tesla Model 3 Performance version due in 2018
Naturally, the study points out that Tesla owners are "fanatical", regardless of where they live or what model they bought. American automaker, Tesla has unveiled the Tesla Model 3 , described as the world's cheapest fully electric vehicle .
Mike Pence force China saying should do more on North Korea
In Georgia, officials said Pence will highlight USA support for the Caucasus nation's sovereignty and territorial integrity. The remarks come two days after North Korea tested a ballistic missile that it claims can reach all of the United States.
Vive's first standalone VR headset aimed at China
The new headset needs no smartphone or PC to function, something that should make it cheaper and easier to adopt for many users. The collaboration with Qualcomm lends the device a Snapdragon 835 chip , based on Qualcomm's all-in-one reference design.
In US first, scientists edit genes of human embryos
Many critics are anxious that the practice could lead to " designer babies " that are engineered with genetic enhancements. But many are opposed to these types of experiments over concerns it could be used to create " designer babies ".
Barbara Sinatra Dies At Age 90
John Thoresen, director of the Barbara Sinatra Children's Center, reported to CNN that Sinatra died of natural causes. They divorced, and her son eventually adopted the name of her second husband, Zeppo Marx of the Marx Brothers.