Long-Term Investments

12 Months Ended

Sep. 30, 2017

Long-Term Investments [Abstract]

LONG-TERM INVESTMENTS

8.  LONG-TERM INVESTMENTS

Long-term investments consist of cash held in trust by the AER which bears interest at a rate of prime minus 0.375% and has no stated date of maturity. These investments are required by the AER to ensure there are sufficient future cash flows to meet the expected future asset retirement obligations and are restricted for this purpose.