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Functionality of the RPS constraint
I am finding it hard to understand the functionality of the RPS constraint. In my model, results under the RPS scenario, I see that the percentage share of generated electricity with renewable sources is well above the minimum RPS percentage defined in the scenario file. To confirm if my model has an issue, I did run the Starter model, and its results showed the same trend.  Kindly help me understand why this behaviour?
I assume the RPS input file defines the minimum percentage share of electricity that should be generated with renewables, and once this minimum share is achieved, the model should pick the other cheaper non-renewables. As an example, if RPS = 30% then we should have:

Total electricity generated with renewables >= 0,3 * Total electricity generated such that once the 30% renewable share is achieved, the rest of the share will come from the more competitive sources (like those prioritised under BAU) and not the expensive renewables. 
Is this correctly understood?
Also, running the Starter model's RPS (without the UC-90 constraint) gives total generated electricity lower than that generated in the Reference scenario. I am not sure why it should be like this?
Best Regards,

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