The UK has lobbied hard to have the mandatory 2030 target watered down, saying it would drive up energy bills.
The EU executive will also outline a goal on emissions cuts for 2030, set to be 35 or 40% below 1990 levels.
Green groups said the proposals lacked ambition and were the acts of a "burnt out" Commission.
Seven years ago, the EU set out a three-pronged energy and climate strategy for 2020.
Emissions of greenhouse gases were to be cut by 20%, energy efficiency was to be improved by a similar amount and one fifth of all energy had to come from renewable resources.
The binding renewables target has been embraced by countries like Germany where a decision to get out of nuclear in 2011 meant a focus on wind and solar.
Other countries, including the UK and Poland, have argued strongly that the mandatory target approach was too restrictive, and was preventing them cutting emissions in the most financially efficient way.
each country needs autonomy having the flexibility to cut emissions in the most cost effective way.
A source within the Commission said that going forward, there would be a EU wide target on renewable energy for 2030, but it was likely that there would not be binding national targets.
The Commission is also set to unveil a more modest carbon emissions cut target, expected to be either 35 or 40%, reflecting the changed economic circumstances since 2007.