I didn't find much information about this reservoir in English language resources, but I found one in Russian Wikipedia, so I will try to translate it here:
Algeti reservoir is a reservoir on the river of Algeti, located in the territory of Georgia in Tetri Ttskaro district, near the village of Tbeti.
The total volume of the reservoir - 65 million m³, useful - 60 million cubic meters. It's is planned to build a hydroelectric power station "Algeti HPP" with a capacity of 1.1 MW on Algeti reservoir.
Water from the Algeti reservoir is used in the irrigation system of Tbisi-Kumisi, which supplies water to villages of Jorjiashvili, Asureti, Borbalo, Koda, Marabda, Khaishi, Dundruki, Kasalari and other villages in Marneuli region.
Down at the Algeti Reservoir
Scenic view to Algeti Reservoir
You can drive down and park your car
Though I would not recommend doing that - the road down to the reservoir is pretty bad and with many pits, you can be stuck easily on that road. If you are going down - make sure you have an SUV at least.
Tremendous view of Algeti reservoir
This view recalls me a scene from the movie 'Michael Clayton' with George Clooney, when he drives his car in a dawn through a fog and stops after seeing horses in a meadow... he goes closer to take a better look and ... boom his car explodes.
Algeti reservoir in Georgia
A dam on Algeti Reservoir
I'm eager to return to this place in summer and would like to float a boat here or to test my eventually new drone to film this place from above.