My interstellar empire is powered by a quasar.
Or at least it will be once I finish my scheme.
See that cloud of glowing dust? That's called the quasar's accretion disc. When stuff falls into the centre, most of it is gobbled up by the collapsing star. But due to conservation of something I can't remember, about six percent of the mass energy is converted into kinetic energy and shot back out at the speed of light (the fastest speed there is) as radiation. That's the beam.
The quasar is in the middle of the inhabited part of the galaxy. There are hundreds of loosely confederated planets and artificial habitats within dozens of lightyears of the Zar.
The Zar. That's what I call the quasar by the way. Or what I will call it, once I have finished my scheme. Once I am Emperor, or Tzar (pronounced Zar) as my subjects will call me. It's a pun. You are allowed to make puns when you are Emperor.
The plan is to turn the Zar into the best and most efficient power plant in the galaxy. Once I have driven my competitors out of business, and established a galactic monopoly on cheap clean energy, I can demand anything I want. Fail to comply and the lights in your houses go out. Fail to comply and the lights in your swimming pools and hospitals go out.
The project is already half complete. I have finished construction of the Unobtanium shell around the outside of the Zar, and I have coated the interior surface with shiny tinfoil. When I want energy I chuck more matter into the hole. The outgoing radiation gets reflected and concentrated into a beam that I can split and shoot across the galaxy to power the worlds in my empire.
I am now accepting bids from any interested parties for the following project:
What is the most reliable way to transmit a beam of energy from my stellar powerplant to the various worlds in the empire?
My original plan was to split the Main Beam and shoot one minibeam to the giant beam catcher on each world. But my team of Eggheads has informed me that many of the worlds in my empire like to move around. Some of the planets orbit their stars. This makes a fixed beam a big no-no. Some of the worlds revolve while orbiting their stars. So even if we move the minibeam to follow the orbit, the beam catcher will point the wrong way most of the time and we end up beaming the planet in half.
The Eggheads also say it is hard to predict the motion of things at this scale. You do not shoot the beam at the planet. You shoot the beam where the planet will be in six years. The planets are very small and very far away and due to a "chaotic system" as they call it, we cannot predict with enough accuracy. Again we either miss the planet entirely or chop it in half. Not good for business.
Hence I come to you, talented investor. Bids are now open for a state-of-the art beam delivery system. The ideal system will provide an effectively unlimited and supremely reliable supply of power to each world in my fledgling empire.
Interested parties are informed that money and resources are no object, as I have recently received a small loan from my father. The successful bidder will have full access to the company fleet as well as our cutting-edge Star Foundries and nano-labs. Please include in your bid an enumerated list of any starships, megacruisers, satellites, artificial habitats, repurposed planetoids, genetically-engineered beings, or works of seminal art you will require.
Other benefits include free Deliveroo breakfasts and lunches for you and your team for the duration of the contract; access to the company parking lot, gym, swimming pool and sauna; complementary haircuts; and free tea and coffee in the break room. Each applicant will receive a goody bag consisting of a company tote bag, lanyard, t-shirt, pen and journal.
Inspired by this answer