**Electrical Power:**

Because of the vast distances from the sun New Horizons will operate at Solar power is impractical. At the elliptical orbit of Pluto the strength of the sun varies from [0.0012 to 0.0004][1] times what we get on Earth. 

Instead of trying to collect the tiny amount of sunlight available New Horizons uses a [Radioisotope Thermal Generator][2] (RTG). Specifically, a General Purpose Heat Source — Radioisotope Thermoelectric Generator (GPHS-RTG) manufactured by General Electric Space Division (now part of Lockheed Martin).
![enter image description here][3]

The GPHS-RTG that New Horizons carries is actually a spare from the [Cassini mission][4]. It provided about 250W at launch, and the decay of the Plutonium causes the power output to drop by approximately 5% every four years, meaning that by now the RTG should be providing about 200W of power.

This graphic shows the position of the RTG on New Horizons.

![enter image description here][5]

For some more reading on New Horizons power systems see [The Pluto-New Horizons RTG and Power System Early
Mission Performance][6], Geffrey K. Ottman and Christopher B. Hersman. (source of the above graphic)

**Propulsion:**

Until someone solves the [N-body problem][7] every spacecraft needs some kind of propulsion to correct its course during the mission. New Horizons uses a [Hydrazine][8] based [propulsion system][9] including four 4.4 N main thrusters and twelve 0.9 N attitude control thrusters. Its 77 kg fuel tank allows a total  post launch delta-v of somewhere over 290 m/s (650 mph).

New Horizons has carried out [several course corrections][10] since its launch. The last at the time of writing was [only a few weeks ago][11].


  [1]: http://blogs.discovermagazine.com/badastronomy/2012/03/15/bafact-math-how-bright-is-the-sun-from-pluto/#.VaS2iflVhBc
  [2]: https://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator
  [3]: http://i.stack.imgur.com/9xbCX.jpg
  [4]: https://en.wikipedia.org/wiki/Cassini%E2%80%93Huygens
  [5]: http://i.stack.imgur.com/pZB6h.jpg
  [6]: http://www.boulder.swri.edu/~tcase/Ottman-Hersman_IECEC_paper.pdf
  [7]: https://en.wikipedia.org/wiki/N-body_problem
  [8]: https://en.wikipedia.org/wiki/Hydrazine
  [9]: https://en.wikipedia.org/wiki/New_Horizons#Propulsion_and_attitude_control
  [10]: https://en.wikipedia.org/wiki/New_Horizons#Trajectory_corrections
  [11]: http://pluto.jhuapl.edu/News-Center/News-Article.php?page=20150630