For starters if this is a FERC regulated line, you have no say, so take it all in stride. Secondly, allowing them to survey does not mean you'll end up with a right of way on you. Third, it'll be good $ if it does go through. You won't be entitled to "royalties", but will receive compensation for signing a right of way agreement and/or damages.
Here's my advice: Let them do the survey. Don't be "that guy" and stand in the way of progress. Our country needs jobs and no other industry is providing them like oil and gas right now. If you get to the point where you start talking specifics on contracts and money, call me and I'll help you any way I can. That's what I do for a living, so I'll make sure you don't get swindled. As for money, it should be upwards of $40 per foot if they don't low ball you or go with eminent domain. My guess is IF this line gets approved and IF it gets built, it will be federally regulated which means you won't have much say in it, so get off on the right foot and play ball on the surveying front. If you decide to be Tommy Toughguy now, it could seriously bite you in the ass later on.