It is a calculated and intentional economic inefficiency, which is deemed worth the cost, in order that the CCP plenum may avoid getting their heads lopped by people with nothing to lose because all of their progeny died of autoimmune reaction to inhaling coal ash.
The poly solar business will die, but only when a sufficient amount of economically productive, greener generation cap is available to provide an reasonable level of insurance against such an outcome, or the reins of power are seized by a new dynasty with post-urban social engineering agenda.