A vegetable-based dielectric fluid comprising in weight percent of triglycerides based on the weight of the fluid: A. Greater than 0 to 100% of at least one of C14:1 or C16:1 fatty acids and at least one of: B. No more than (≦) 10% of C18:1 fatty acids C. No more than (≦) 12% of one or more polyunsaturated fatty acids and D. No more than (≦) 7% of one or more saturated fatty acids. The dielectric fluid is a useful transformer oil.
