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The official was speaking during a special national assembly committee meeting.
The environmental impact report has not been presented because it must include the indigenous consultation which has been a complicated process, an assembly release quoted Obregón as saying.
He added that despite the slow advance, close to US$150mn has been invested in the US$3bn project.
Diquis is one of three routes outlined in ICE's 2014-35 power generation expansion plan. The other two are renewables and LNG.