Just came across this useful review of Guyana's energy sector in Kaieteur News. It is definitely incomplete but there is a problem getting documentation in many areas.
There have been many solar panels put in place in the hinterland but how many are still functional and in use is a question. A learning experience.
There are plans to increase hydropower but not yet on the scale needed. The future of the Amaila hydropower project is still being considered.
A useful page is that at the Caricom Energy Program which has links to further resources.
The GEA has a Strategic Plan for 2014-2017 on its web site - more on this later.