Citigroup published a research report, announcing the commencement of a 30-day upward catalyst observation period for $ENN ENERGY (02688.HK)$ It envisions the chairman actively communicating with investors, clarifying its business strategy to rebuild investor confidence, believing that the current price valuation and dividend yield are attractive, reiterating a 'buy' rating, and predicting a dividend yield of 5% this year, with a target price of 66 Hong Kong dollars.