FPL is changing their GSDT (General Service Demand Time of Use) rate. The demand measurement window is going from 15-minute to 30-minute intervals starting in October. This could significantly impact demand charges for customers with short-duration peaks.
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Florida Power & Light Schedule GSDT changes - demand window adjustment
This is huge for my Phoenix clients with FPL sister companies. 30-minute windows typically lower demand charges by 10-15% for customers with brief spikes. Equipment startup loads get averaged out over the longer period.
I've got a food processing plant in Jacksonville that's going to love this. They have compressor startups that create 5-minute demand spikes of 200kW above their normal load. The 30-minute window should cut their demand charges substantially.
Not everyone wins though. Customers with sustained peaks over 30 minutes won't see much benefit. And there's a small increase in the per-kW charge to offset FPL's revenue loss from the window change.
The per-kW increase is only $0.35/kW. For most customers, the demand reduction from the longer window will more than offset that. I'm estimating 8-12% savings for customers with spiky loads.
Just ran the numbers for a client. Their August bill would have been $1,240 lower with the 30-minute window. The change is definitely customer-friendly for most load profiles.