Yes, happy days. I can remember getting my first billion blasting NPCs in the Haz RES at 10 million an hour with the level 5 PP bonus. That's not rally worth it these days. If combat is your thing, CZs with massacre missions will get you more money, but I wouldn't recommend that without sorting out engineering first. It's also got a lot tougher since they introduced the special ops ships.
You get 10 times a s much money now doing either mining or sightseeing missions form Robigo.
i never got up to a billion, only like 200 million, doing like you, power play farming, then bounty hunting farming. somewhere in there i started grinding towards a cutter, just stacking up planetary missions where you'd board flip to get a bunch of missions, then fly around the planet, blow up a base, then hand back in, doing it over and over. got close, then one week missed rank 5 in power play (back then undermining meant interdicting npc's for 40 million hours a week, i've learned alot this past week), and i basically quit playing grinded too hard.
i played for a few weeks a year since then, enough to get a decent bit of engineering one year, then came back around when void opals came out and got my net worth to 500 million. now void opals seem to worth nothing, they used to be 16 million i think. but i didn't want to mine so i'm trying to bounty hunt. 10 million an hour - i'm not up there, can't handle the wings very well yet. last night i beat an anaconda with 2 smaller ships (cobras or vipers or something), and that was like 10 minutes of my life that was pretty nerve wracking lol, barely lived. i think with power play double bounty i get like 600k...
sigh
inara is down and coriolis won't produce a link shortener
A ship builder, outfitting and comparison tool for Elite Dangerous
coriolis.io
edit
oh that's neat, the forum resolved the link into a clickable image link