An international agency promoting clean energy called Sunday for investments in renewable energy projects to be more than doubled, redirecting funds from fossil fuels.

The Abu Dhabi-based International Renewable Energy Agency (IRENA) also said that electricity output from renewable sources would more than double over the next decade.

"The agency's data shows that annual renewable energy investment needs to double from around $330 billion today to close to $750 billion to deploy renewable energy at the speed required," it said in a report.

"Much of the needed investment can be met by redirecting planned fossil fuel investment," IRENA said.

It estimated as much as $10 trillion worth of investments are planned in non-renewables-related energy projects by 2030, risking failure to meet the goals of fighting global warming.

Some $2.6 trillion had been invested in renewable energy projects by end 2019, according to the United Nations Environment Programme.

IRENA director general Francesco La Camera told reporters on the sidelines of its annual assembly in Abu Dhabi that renewable energy programmes must be accelerated.