[R] ggplot incorrect legend

[jcrosbie]

Thank you, that was very helpful. 

Would it be possible to rename the legend values as well. Example 1 as
Biomass, 2 as coal, 4 as gas, 5 as hydro?

ggplot(data=tempTable, aes(x=Bands8, y=AvailableMWNewFormat,
fill=as.factor(FuelTypeNum))) +
  geom_bar(position="stack", stat="identity")+
  guides(fill = guide_legend(title = "Fuel Type", title.position = "top"))+
  xlab( "Price Bands")+
  ylab("Available MW") 

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