France aims to spend 100 billion euros to pull its economy out of one of Europe's worst slumps, under a fast-moving recovery plan that revives President Emmanuel Macron's pro-business reforms with a greener tinge.

The $118 billion stimulus equates to 4% of gross domestic product, meaning France is plowing proportionally more public cash into its coronavirus-ravaged economy than any other big European country, an official said.

The two-year package is focused on supporting growth for companies, which Prime Minister Jean Castex said would receive funds on a use-it-or-lose-it basis.

It earmarks 35 billion euros to make the economy more competitive and 30 billion to promote greener energy policies.

The rest will go on supporting jobs, training and broader social initiatives with the aim of creating at least 160,000 jobs next year.

"Economically and socially it is infinitely better to temporarily worsen the pubic finances to invest, re-arm the economy and move forward than to sink into austerity and let unemployment and human drama explode," Castex told journalists.

France is on course for one of Europe's worst recessions and its deepest since World War Two, with an 11% drop in GDP forecast for 2020 as a whole following a 13.8% second quarter contraction that coincided with a coronavirus lockdown.

Macron is banking on returning the euro zone's second biggest economy to pre-crisis levels of activity by 2022 - re-election year should he decide to run again - and ING economist Charlotte de Montpellier said the plan would need to be implemented quickly to succeed.

However, it does little to directly support the traditional engine of French growth, consumer demand. By contrast, neighboring Germany launched a 130 billion euro stimulus in June with a cut in value-added sales tax.

Instead, France is betting that, by supporting jobs, the plan will give consumers the confidence to start spending the 100 billion euros in extra savings that they built up during the two-month coronavirus lockdown.

With already flagged cuts in business taxes worth 10 billion euros in both 2021 and 2022, its timeline would restore Macron's record on the economy while putting back on track a pro-business agenda that has foundered under a pushback by powerful unions and, latterly, the coronavirus crisis.

GREENING THE ECONOMY

The government wants the plan's funds to be plowed into the economy as soon as possible and Castex said companies that failed to make quick use of their share would see the money redeployed.

Focused on the industrial, construction and transport sectors, all of which suffered during one of Europe's strictest lockdowns, much of the new investment seeks to accelerate a transition away from fossil fuels.

Macron has made that a priority since his ruling party suffered losses to environmentalists in municipal elections this year.

"It's good but this can't be limited to two years, we need to keep it up for 10 years," said lawmaker Mathieu Orphelin, who left Macron's party last year to set up a more environmentally focused party.

About 6 billion euros is slated for making public buildings and homes better insulated.

The hydrogen industry - used to store and transport energy created by wind turbines and solar panels - will get 2 billion euros over two years, a sector that Germany is also betting heavily on with plans to invest 9 billion euros by 2030.

ING's de Montpellier said that, for France, speed was of the essence.

"It remains to be seen whether the amounts will be quickly released and if this plan will quickly have effect," she wrote in a research note. "This ... will ultimately determine (its) success or failure."