Hi Polarman! 1. I've not decided wich generator to buy yet, but I think it will be an 3 phase self magneting. So I don't have to regulate the voltage. 2. pelton turbine 3. Yes there is a flywheel 4. I need to adjust 100% of the total load The turbine is an old pelton with a very slow gravity regulator, and it will not bee good enough even with the flywheel when on isolated grid. The reason I can not deliver the unused power to the grid is because it is nearly 15km away. My idea on solving this is to measure the load in all three phases and use this to decide when in the half period to use the triac or tyristor. Then I can also avoid unbalanced load. Another way to do it is to measure the speed of the generator with a tachometer, but this will not adjust eventually unballanced load. Do you have any meanings on what configuration of tyristors/triacs and resistors to use. I found a webpage about this, but I'm not sure what to use. http://www.ccipower.com/support/load.php