answer: #Person1# tells #Person2# #Person1#'s managed to reduce energy consumption by a heat recovery system and explains how it works.
documents: #Person1#: We've managed to reduce our energy consumption in our factory by about 15 per cent in the last two years.
  #Person2#: That's excellent. How have you managed that?
  #Person1#: Mainly because we've invested in a heat recovery system.
  #Person2#: What does that mean exactly?
  #Person1#: Well, we use the exhaust gases from our printing presses to provide energy to heat our dryers.
  #Person2#: What other sources of energy do you use?
  #Person1#: We don't use any fossil fuels. Most of our power comes from hydro-electric plants. We're hoping to use even more energy from alternative sources in the future - perhaps even wind power.