Refuelling the motor industry
What Peter Mandelson will announce this afternoon is guarantees for borrowings by manufacturers of cars and construction vehicles, as well as their suppliers.
Many of these companies were too big to qualify for the guarantees from taxpayers made available to small and medium size companies by the Business department earlier this month.
But these substantial employers are having terrible difficulty borrowing from banks and financial markets. So the taxpayer will now stand behind a portion of their debts.
These new guarantees are expected to underpin several billion pounds of fresh bank loans for the industry.
The state support is expected to be directed towards investment by the motor industry in low-carbon technologies - which may prevent the measures falling foul of a European Union prohibition on state support for particular industries.
The motor industry has been desperate for help with research and development into a new generation of "green" cars.
The funds for all this will involve some new money from the Treasury and some re-allocation for other elements of the Business department's budget.
The Business secretary is also expected to announce support for the retraining of motor-industry employees who have been made idle in recent weeks as the big carmakers have temporarily shut down production lines.
The measures are likely to be seen as a particular boon for Jaguar Land Rover, the subsidiary of India Tata Motors, which has been anxious about whether it would be able to refinance a huge loan when it falls due in June.
What will probably be announced at a later date is the use of government guarantees for the issue of bonds created out of personal loans to car-buyers - which would be a way of ending the drought of credit for those wanting to buy a motor.
UPDATE, 16:05PM: The scale of the support for the motor industry announced by Peter Mandelson this afternoon is not enormous, but is pretty green.