--Government scheme available for around GBP50 billion projects

--In three parts including GBP6 billion pipeline due to proceed in the next 12 months

--Experts question extent of projects that will qualify for the guarantees

(Adds comment, background.)

By Ainsley Thomson

LONDON--U.K. Chancellor of the Exchequer George Osborne will announce Wednesday his latest plans to stimulate the recession-hit U.K. economy that will see government guarantees provided on around GBP50 billion ($78 billion) of private investment in infrastructure projects and exports.

The plan, called U.K. Guarantees, is designed to use the strength of the public sector balance sheet to accelerate major infrastructure projects that have stalled because of difficulty accessing private finance under the tough credit conditions.

"Britain's credibility has been hard-won and involved difficult decisions, so I want to make sure its benefits are passed on to the whole economy," Mr. Osborne is expected to say when he unveils the plan in London Wednesday, according to a transcript of his announcement speech.

The use of state guarantees is one of the few measures the government can use to stimulate the economy that doesn't affect its primary goal of tackling the budget deficit.

As the economy, which fell back into recession in the first quarter, continues to deteriorate, the government has come under increasing pressure from opposition lawmakers, along with some business groups and economists, to ease its aggressive austerity measures.

But Mr. Osborne and the government have vowed to stay the course on their plans to eliminate the country's structural budget deficit over the next five years, which means their credibility may be dented if the pace of the spending cuts is slowed or if the country borrows more to instigate a tax break.

As a result, the government is hamstrung in the measures it can use to boost growth.

Crucially, the use of the government guarantees doesn't add to the U.K.'s budget deficit because the guarantees are regarded as "contingent liabilities," liabilities that may or may not be incurred in the future, and are not included on the national accounts.

The U.K. Guarantees plan comes after the Treasury and Bank of England launched a joint initiative last month to offer U.K. banks unprecedented access to central bank funds if they vow to keep lending to households and businesses. It's hoped the plan, called funding for lending, will result in an extra GBP80 billion of credit flowing into the economy.

In addition, the government is expected to announce plans to use government guarantees to help the housing sector in the coming weeks.

The coalition government has made no secret of the fact that it views the U.K.'s creaking infrastructure as a major impediment to the country's future economic prosperity.

The project Mr. Osborne will announce Wednesday will potentially kick-start around GBP40 billion of infrastructure projects in a range of sectors including transport, utilities, energy and communications.

In order to be eligible for the government guarantees, projects must be ready to start construction within 12 months from the guarantee being given. The projects must also be financially credible and be of good value to the taxpayer, the Treasury said.

A Treasury official said the specific nature of the government guarantee would vary between projects.

Mr. Osborne will also announce a new temporary lending program to help major infrastructure projects that combine both public and private investment, but that are struggling to secure the required amount of private lending to go ahead.

The Treasury said an estimated GBP6 billion worth of public-private projects are due to proceed in the next 12 months that could be eligible for the program.

The final component of the U.K. Guarantees plan is a GBP5 billion exports-refinancing facility to provide long-term loans for overseas buyers of U.K. exports at competitive rates by guaranteeing a series of short-term bank loans

Industry experts questioned how many projects would benefit from the scheme because of the criteria that have to be fulfilled to get access to the funds.

"Infrastructure fund managers claim that banks, especially the government-owned ones like RBS and Lloyds, are quite willing to provide finance for infrastructure projects already," said Stephen Peters, Investment Trust analyst at Charles Stanley.

"And even if government money is accessed under the scheme it is unclear how this will affect the interests of existing debt holders and the equity shareholders," he added.

The Government is also sketchy on details of the guarantees it will give--the usual attraction of any Private Finance Initiative, PFI, or Public Private Partnership, PPI, is that its operators provide a steady return generated from inflation-linked, government-backed revenue.

"We need more detail on what this GBP40 billion pipeline of projects ready to go comprises--as far as I am aware there is no paralysis in lending for projects," said Giles Frost, director of listed infrastructure fund International Public Partnerships Ltd. (INPP.LN).

"It may include more risky projects, such as nuclear power programs, which many managers wouldn't invest in," he added.

(Marietta Cauchi in London contributed to this article.)

Write to Ainsley Thomson at ainsley.thomson@dowjones.com

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