Possible Clues:

• Don Quixote's "foe"
• Suspicion pepper-grinder is child’s toy
• Old flour supplier Will keeps changing mind
• Misfortune after success with dam losing a generator
• Quixote adversary
• Building for grinding grain
• Source of green power
• Mind-set in Last Testament creates its own energy in turn
• Mind-bending in the middle of last testament from Don Quixote's foe
• Strength of character includes independent mind initially not too big for Don Quixote to have a go at