By Dan Weil The S&P; 500 Utilities index has climbed 2.3% so far this year, while the overall S&P; 500 has dropped 14%. Utilities have provided an oasis of stability inside a volatile stock market in recent months. The S&P 500 Utilities index has climbed 2.3% so far this year, while the overall S&P 500 has dropped 14%. Wells Fargo analysts have offered commentary on four of their overweight utility names who are in the midst of holding analyst days. NextEra Energy (Analyst Day: June 14)“What a difference a year makes” for NextEra (NEE) – Get NextEra Energy Inc. Report, the analysts wrote in a …