It's very hard to judge the trend in your Grid bill when there are so many factors that go into monthly usage, but I think my consumption is down along with the bill as a result of a big changeover to LED lighting both in and outside of my Pearl Street buisness.
While a bit pricey, the bulbs and fixtures do provide lots of light for less money.
I would recommend conversion, paticularly of outdoor fixtures. In a year or so, the prices will become even more attractive.
Energy Saving Lighting Alternatives: LEDs, CFLs & OLEDs – T. Rowe Price