Enbridge shares are up 15% in the past six months, easily beating the broader energy sector. Is there still value here?Enbridge (ENB 1.57%) is an $85 billion midstream giant with a business that spans across North America. Its dividend yield is 6.7%, which is multiples of the 1.2% yield you'd collect from the S&P 500 index and the 3.1% on offer from the average energy stock, using Energy Select Sector SPDR ETF (XLE 0.37%) as an industry proxy.The only problem is that Enbridge's shares have rallied strongly ...