         .attr("data-tooltip-text", (d) ->
           html = "Installed capacity: #{Metric.autoscale_value(d.value_x(), 'MW', 2)}
                   <br/>
-                  Operating costs: #{Metric.autoscale_value d.original_y_value(), 'euro', 2}"
+                  Operating costs: #{Metric.autoscale_value d.original_y_value(), 'euro', 2}
+                  <br/>
+                  Availability: #{d.availability_value()}
+                  "
           if d.get('key') == 'must_run'
             html += '*<br/>* Must run plants do not participate in merit order'
           html

      k = @get 'key'
      @gquery_x = new ChartSerie
        gquery_key: "merit_order_#{k}_capacity_in_merit_order_table"
      D3.merit_order.series.push @gquery_x
      @gquery_y = new ChartSerie
        gquery_key: "merit_order_#{k}_operating_costs_in_merit_order_table"
      D3.merit_order.series.push @gquery_y

    value_x: => @gquery_x.safe_future_value()


      if @get('key') == 'must_run' then 0 else @original_y_value()

    original_y_value: => @gquery_y.safe_future_value()

    availability_value: -> Metric.ratio_as_percentage @gquery_availability.safe_future_value()

    label: => @get('label') || @get('key')

