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REVENUE - TIMING OF REVENUE RECOGNITION - BALANCE SHEET (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | --- | --- | ---
Customer accounts receivable |  |  |  |
Billed | $ 268,043 | $ 212,838 | $ 205,482 | $ 134,173
Unbilled revenues | 15,032 | 10,351 | 12,663 | 9,226
Customers' credit balances and deposits | (22,216) | (32,586) | $ (22,699) | $ (25,934)
Customers accounts receivables & Customers' credit balances and deposits | 260,859 | 190,603 |  |
Operating Segments | Natural Gas Distribution |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 113,072 | 54,514 |  |
Unbilled revenues | 11,653 | 8,427 |  |
Customers' credit balances and deposits | (22,216) | (32,586) |  |
Customers accounts receivables & Customers' credit balances and deposits | 102,509 | 30,355 |  |
Operating Segments | Clean Energy Ventures |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 5,613 | 5,534 |  |
Unbilled revenues | 3,379 | 1,924 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 8,992 | 7,458 |  |
Operating Segments | Energy Services |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 141,495 | 147,087 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 141,495 | 147,087 |  |
Operating Segments | Storage and Transportation |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 5,775 | 3,956 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | 5,775 | 3,956 |  |
Home Services and Other |  |  |  |
Customer accounts receivable |  |  |  |
Billed | 2,088 | 1,747 |  |
Unbilled revenues | 0 | 0 |  |
Customers' credit balances and deposits | 0 | 0 |  |
Customers accounts receivables & Customers' credit balances and deposits | $ 2,088 | $ 1,747 |  |

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