Can Greentree Inn have electricity without a room card?

You can't. Greentree Inn official website introduced that Greentree Inn cannot use electricity without a room card, and hotel rooms cannot use electricity without a card. The hotel will give two room cards, one can be taken out and the other can be inserted in the slot to use electricity. GreenTree Inn Hotel Management Group is a high-grade and cost-effective business hotel chain founded by Mr. Xu Shuguang and several American companies in China. It is a wholly foreign-owned economy hotel chain in China market and one of the five largest economy hotel chains in China.