Wales is becoming one of the UK's biggest cheap energy producers and will be generating an increasing amount of electricity using renewable energy in the foreseeable future.
According to Wales' assembly government, the region has the potential to generate twice its electricity needs from renewable sources within the next 15 years.
Environment minister Jane Davidson is expected to make a statement setting out the future of Wales' sustainable cheap energy usage this week.
The assembly previously set a target of generating seven terawatt-hours of green energy by 2020 but the potential is now far greater.
"I am confident that considerable additional capacity will come on line over the coming years to significantly exceed the 2020 7TWh target," Ms Davidson said.
However, Gordon James, president of Friends of the Earth Cymru, labelled the target "unrealistic".
He pointed out that the biggest obstacle to the goals is that permission for generating more than 50 megawatts through a wind farm for example, currently lies with Westminster and not the Welsh assembly government.
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