The final decision on replacing the UK's four aging nuclear subs is due to be made in 2016, with Prime Minister David Cameron being a strong backer of continuing the country's at-sea nuclear deterrent.
The British government had said earlier that the purchase of new Vanguard-class vessels, which are capable of carrying Trident missiles, would require around 15-20 billion pounds, without specifying estimated maintenance costs.
However, Minister of State for Defense Procurement Philip Dunne said on Friday that the price tag for the state-of-the-art submarines will come in at around 25 billion pounds.
The new figures were revealed in Dunne's written parliamentary response to fellow Conservative party lawmaker Crispin Blunt's request.
According to the response, the in-service costs would amount to about 6 percent of the annual defense budget, which now stands at around 34 billion pounds, over the vessels' lifetime.
BREAKING: UK to order 4 new Trident nuclear submarines - Cameron http://t.co/s2RenfLWX1 #CPC15 pic.twitter.com/uh6VHuvBWV
— RT (@RT_com) October 7, 2015
Blunt used the data provided by the Defense Ministry to calculate the total cost of the project, which he said will be "167 billion pounds."
"My office's calculation based on an in-service date of 2028 and a missile extension until 2060," the MP told Reuters.
"The successor Trident program is going to consume more than double the proportion of the defense budget of its predecessor... The price required, both from the UK taxpayer and our conventional forces, is now too high to be rational or sensible," Blunt stressed.
The lawmaker's figure was based on the presumption that the UK will spend 2 percent of its annual GDP on defense, as Cameron has promised, and a forecast that the country's GDP will grow 2.48 percent on average every year between 2020 and 2060.
Reuters said that they had repeated the calculations using the same numbers and conditions and also come to the same result - 167 billion pounds.
The Defense Ministry defended the rise in cost, saying that there was no alternative to the Trident-based nuclear deterrent in terms of both price and capability.
"At around 6 percent of the annual defense budget, the in-service costs of the UK's national deterrent ... are affordable and represent an investment in a capability which plays an important role in ensuring the UK's national security," the ministry stressed.
However, there is strong opposition to prolonging the Trident program in Britain, with critics suggesting that the money would better spent on families facing austerity.
The main Labour Party remains split on the issue, as its new leader, Jeremy Corbyn, doesn't share the majority's support for replacing the nuclear subs.
In late-September, Corbyn said he was "opposed to using nuclear weapons" and wouldn't use the Trident system even if it was at his disposal.
The leader of the Scottish Nationalist Party (SNP), Nicola Sturgeon, has said that the renewal of Trident "is unjustified. It is unaffordable. It is immoral."
"Be in no doubt. The SNP will stand against Trident - today, tomorrow and always," Sturgeon promised at the party's conference earlier this month.
Last year, a poll by the Guardian newspaper revealed that 79 percent of British voters believe that UK shouldn't renew its Trident program.
Comment: Earlier this year thousands marched in London opposing the replacement of the Trident nuclear defense system stressing 'welfare not warfare'.
With the budgets of three million working class families about to be plundered by an average of £1,300 per year under the 'austerity axe' of Chancellor of the Exchequer, George Osborne; this decision indicates where the real priorities of the so-called 'compassionate' Conservatives really lay.
Despite the pro-austerity rhetoric from Westminster, we are not "all in this together". In Britain today, the richest are 105 times better off than the poorest in society. It is the "European capital of inequality", worse even than the United States! Studies show that these obscene, unnecessarily harsh austerity measures are having devastating repercussions among those most vulnerable, as people go hungry, forcing dependency on food banks.
In May this year, Prime Minister David Cameron told MP's that he 'will not waste a single moment with getting on with the task' of reshaping Britain, and of 'building something special'. We are beginning to see just what sort of psychopathic, elitist reality he is intent on building!