Not sure how a large capacitor affects the load, but I have heard/read talk of using capacitors rather than batteries for storing solar/wind made electricity. Here's a top link that popped up on a search of "large scale capacitor storage from generators".
ScienceDirect - Electric Power Systems Research : Super-capacitor based energy storage system for improved load frequency control
Maybe put your generator load into an electrolytic cell? Give it something to do and collect some Hydrogen and/or Oxygen if you want at the same time.
