Table 1.

The expected total cost for$\beta =0.3$, usage rate (u) = 500 and.$\alpha =0.1,0.3,0.5$.

τ (months)	$k$	ETC ($)
		$\alpha =0.1$	$\alpha =0.3$	$\alpha =0.5$
1	36	1421	1464	1499
2	24	895.749	976.809	1048
3	12	731.344	850.606	942.031
4	9	657.732	810.018	904.5
6	6	601.91	795.817	899.055
9	4	593.072	812.607	940.019
12	3	609.81	860.069	932.335
18	2	651.268	898.54	904.144

ETC, expected total cost.