Energy stocks were mixed Friday afternoon, with the NYSE Energy Sector Index fractionally lower and the State Street Energy Select Sector SPDR ETF (XLE) up 0.4%.

The Philadelphia Oil Service Sector Index was climbing 2.8%, and the Dow Jones US Utilities Index increased 0.1%.

Front-month West Texas Intermediate crude oil fell 4.1% to $88.43 a barrel, and the global benchmark Brent crude contract dropped 4.6% to $96.07 a barrel. Henry Hub natural gas futures shed 0.6% to $2.90 per 1 million BTU.

In corporate news, NextEra Energy (NEE) shares were down 0.5%. The company reported Q2 adjusted earnings Friday of $1.15 per share, up from $1.05 a year earlier. Analysts polled by FactSet expected $1.11. Operating revenue for the quarter ended June 30 was $7.53 billion, up from $6.70 billion a year ago, but below analysts' estimates for $8.11 billion.