Ramp rate nuclear energy

[martinhjel]

According to OECD NEA A the ramp rate of nuclear reactors are 3-5% per min. So why is the ramp rate for nuclear defined as 30% per hour in the europe_v51 dataset?

Suggest updating this to 85%, comparable to Gas CCGT or extend Empire to handle minimum production level for thermal plants and set it to 100%.

Additional resource:
Factsheet Load following capabilities of nuclear power plants

[martinhjel]

First task could be to check how big impact the ramp rate has on the results, and perhaps make it an optional feature of empire.