Hi there. Are you asking what the fees are when it comes to NRGY? They would be 0.49%, or $4.90 per $1000 invested every year.
These fees are pretty much right inline with most oil and gas ETFs here in Canada. In fact they're a little cheaper. It just depends if you want to go with an equal weight fund from all of the major producers or you want a capped energy fund like XEG which prioritizes the larger companies with more weighting to a certain degree.
Because of the volatility in terms of the major producers results, NRGY has been the better performer over the last decade but by a pretty slim margin. For energy exposure, I don't think you can go wrong with either of these.