\frametitle{Preview: Investment optimisation}

  Preview for next time:

  Next time we will also optimise \alert{investment} in the \alert{capacities} of generators,
  storage and network lines, to maximise \alert{long-run efficiency}.

  We will promote the capacities $G_{i,s}$, $G_{i,r,*}$, $E_{i,r}$ and
  $F_{\ell}$ to optimisation variables.