642
N. Nakatsuka et al.
Fig. 42.6 Annual cost when
varying the selling price of
electricity
Annual Cost yen/year
% of original electricity selling price
0
5,000,000
10,000,000
15,000,000
20,000,000
25,000,000
30,000,000
35,000,000
40,000,000
45,000,000
50,000,000
0
20
40
60
80
100
120
Annual cost
(Scenario A)
Annual cost
(Scenario B)
Scenario A = Scenario B
87.6% (35 yen/kWh + tax)
scenario A will be equal to that of scenario B when the selling price of electricity is
approximately 88% (35 yen/kWh + tax) of the original 40 yen/kWh + tax value.
Figure 42.7 shows the total annual cost when varying woodchip price from 0 to
200% of its original value. As indicated, the annual cost of scenario A is equal to
that of scenario B when the woodship price is approximately 130% (18 yen/kg) of
its original 14.3 yen/kg value.
Figure 42.8 shows the influence of woodchip price and electricity selling price on
the annual cost of the two scenarios. Note that the solid line indicates the condition in
which the annual costs for the two scenarios are equal. As described here, the annual
cost in the original condition for scenario B is slightly lower than that in scenario A.
As a matter of economic sustainability, it is possible to raise the woodchip price by
Fig. 42.7 Annual cost when
varying the woodchip price
Annual cost yen/year
% of original woodchip price
-5,000,000
0
5,000,000
10,000,000
15,000,000
20,000,000
25,000,000
30,000,000
0 20 40 60 80 100 120 140 160 180 200
Annual cost
(Scenario A)
Annual cost
(Scenario B)
Scenario A = Scenario B
127.3% (18.2 yen/kg)