CONTRACT ASSETS

6 Months Ended

12 Months Ended

Jun. 30, 2023

Dec. 31, 2022

Contract assets [abstract]

CONTRACT ASSETS

11. CONTRACT ASSETS

		December 31,			June 30,
		2022			2023			2023
		CNY			CNY			US$
		(Audited)			(Unaudited)			(Unaudited)
Non-current
Service concession assets	(a)		89,740			89,112			12,286
Less: impairment allowance			(27	)		(27	)		(4	)
			89,713			89,085			12,282
Current
Service concession assets	(a)		7,423			7,423			1,023
Other contract assets	(b)		14,930			14,671			2,023
Less: impairment allowance			(706	)		(4,252	)		(586	)
			21,647			17,842			2,460
Total			111,360			106,927			14,742

(a) Service concession assets bearing an imputed interest of 7% arose from the Group's revenue from construction service under a build-own-transfer ("BOT") arrangement rendered by the Group's subsidiary, Shaoguan Angrui Environmental Technology Development Co., Limited ("Shaoguan Angrui"). The facilities that the service concession arrangement relate to were under construction phases from June 2018 to December 2020 and commenced operation in January 2021.

The amounts for the service concession arrangement are not yet due for payment and will be settled by revenue to be generated during the operating periods of the service concession arrangement. Amounts billed will be transferred to trade receivables.

As of December 31, 2022, and June 30, 2023, the Group’s concession rights associated with the environmental water projects (comprising intangible assets, contract assets and trade receivables) with aggregate gross carrying amounts of CNY139,060 and CNY144,415, respectively, were pledged to secure bank loans from the Bank of Communications with outstanding balances of CNY74,000 and CNY72,500, respectively. Please refer to Note 18 for further details.

(b) The balances as of December 31, 2022 and June 30, 2023 comprised contract assets arising from performance under certain water treatment plant construction service contracts. Such contracts include payment schedules that require progress payments over the service periods when milestones are reached.

The movements in the provision for impairment of contract assets are as follows:

	Year Ended December 31,		Six Months Ended June 30,
	2022		2023		2023
	CNY		CNY		US$
	(Audited)		(Unaudited)		(Unaudited)
Beginning of the year/period		562		733		106
Provision for expected credit loss, net		171		3,546		484
End of the year/period		733		4,279		590

An impairment analysis is performed at each reporting date using the probability-of-default approach to measure expected credit losses. The probability of default rates is estimated based on comparable entities with published credit ratings. The calculation reflects the probability-weighted outcome, the time value of money and reasonable and supportable information that is available at the reporting date about past events, current conditions, and forward-looking credit risk information. As of December 31, 2022 and June 30, 2023, assumed the default rate ranged from 0.03% to 43.51% and from 0.03% to 76.00%, respectively.

15. CONTRACT ASSETS

		December 31,
		2021			2022			2022
		CNY			CNY			US$
Non-current
Service concession assets	(a)		91,062			89,740			13,010
Less: impairment allowance			(27	)		(27	)		(4	)
			91,035			89,713			13,006
Current
Service concession assets	(a)		7,423			7,423			1,076
Other contract assets	(b)		8,443			14,930			2,164
Less: impairment allowance			(535	)		(706	)		(102	)
			15,331			21,647			3,138
Total			106,366			111,360			16,144

(a) Service concession assets bearing an imputed interest of 7% arose from the Group's revenue from construction service under a BOT arrangement rendered by the Group's subsidiary, Shaoguan Angrui. The facilities that the service concession arrangement relate to were under construction phases from June 2018 to January 2021 and commenced operation in January 2021.

The amounts for the service concession arrangement are not yet due for payment and will be settled by revenue to be generated during the operating periods of the service concession arrangement. Amounts billed will be transferred to trade receivables.

As of December 31, 2021 and 2022, the Group’s concession rights and assets associated with the environmental water projects (comprising intangible asset, contract assets and trade receivables) with aggregate gross carrying amounts of CNY129,437 and CNY139,060 (US$20,160), respectively, were pledged to secure bank loans from Bank of Communications with outstanding balances of CNY77,000 and CNY74,000 (US$10,728), respectively. Please refer to Note 21 for further details.

(b) The balances as of December 31, 2021 and 2022 comprised contract assets arising from performance under a water treatment plant construction service contract. Such contracts include payment schedules that require progress payments over the service periods when milestones are reached.

The movements in the provision for impairment of contract assets are as follows:

	December 31,
	2021		2022		2022
	CNY		CNY		US$
Beginning of the year		205		562		81
Provision for expected credit losses, net		357		171		25
End of the year		562		733		106

An impairment analysis is performed at each reporting date using the probability-of-default approach to measure ECL. The probability of default rates are estimated based on comparable entities with published credit ratings. The calculation reflects the probability-weighted outcome, the time value of money and reasonable and supportable information that is available at the reporting date about past events, current conditions and forward-looking credit risk information. As of December 31, 2021 and 2022, the assumed default rate ranged from 0.03% to 55.93% and from 0.03% to 43.51%, respectively.