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CONTRACT ASSETS (Tables)
 12 Months Ended
Dec. 31, 2022
Contract assets [abstract]  
Schedule of 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.

Schedule of the movements in the provision for impairment of contract assets
             
   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