My question is about differences between reservoir-hydropower and run-of-river power plants. Are run-of-river plants less efficient? what would be an approximate guess of the differences? (assuming they are placed in the same catchment). Would annual capacity factors (% of time in operation) differ? by how much?
This answer makes me think that reservoir hydropower would be more efficient because it can capture a larger % of the kinetic energy than wind power. Arguably the run-of-river plants would be in a similar situation, because they are less able to slow down the water flow in comparison with reservoir hydropower. Obviously water and air are very different fluids and I can't just translate the efficiencies from windpower.
Regarding capacity factors, in principle I have no reason to think ROR has lower capacity factors. Water throughput would depend on the catchment area and I guess both have similar maintenance requirements. However, all these are intuitions, I have not found real data to corroborate my hypothesis.