Britain could have built a sovereign wealth fund worth £1 trillion by investing its North Sea oil revenues, according to Treasury modelling that highlights the scale of a missed economic opportunity under successive governments.
The calculation, reported by the BBC’s economics editor Faisal Islam, estimates that the UK could have accumulated a vast national investment fund had it saved the proceeds from North Sea oil and gas rather than using them to support government finances.
Treasury officials reportedly modelled what would have happened if around £200 billion in historical oil and gas revenues had been invested and allowed to grow at a rate comparable to Norway’s sovereign wealth fund.
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The findings raise fresh questions about the legacy of Margaret Thatcher’s economic policies, which saw North Sea revenues used to help reduce public borrowing and fund tax cuts rather than being systematically saved for future generations.
While the money helped successive governments manage the public finances, Britain missed the opportunity to turn a finite natural resource into a lasting source of national wealth.
Norway took a markedly different approach. Its Government Pension Fund Global, established in 1990 and first funded in 1996, channels petroleum revenues into investments around the world.
The fund has since grown into one of the world’s largest sovereign wealth funds, worth trillions of pounds. Its investment returns help support Norway’s public finances, while strict rules limit how much the government can withdraw.
Had Britain followed a similar model, the country could now possess a substantial financial asset capable of generating returns long after North Sea oil production declines.
Such a fund could have provided an additional source of money for public services, infrastructure and investment, potentially easing pressure on taxpayers and reducing reliance on government borrowing.
Instead, successive administrations spent the proceeds as they arrived, leaving Britain without a comparable financial cushion.
The £1 trillion figure is a hypothetical estimate rather than a guaranteed outcome. Establishing such a fund would have required governments to forgo some immediate spending or tax reductions, while its eventual value would have depended on investment performance and withdrawals.
The Treasury’s calculations nevertheless underline the potential long-term cost of failing to preserve the proceeds of Britain’s natural resources.
The government has now announced a new £2 billion Energy Wealth Fund, intended to reinvest North Sea revenues into renewable and low-carbon energy projects.
It represents a belated attempt to ensure the country’s remaining energy wealth delivers lasting benefits. But with decades of oil revenues already spent, the question remains how much more secure Britain’s public finances might have been had that principle been adopted from the beginning.