Palm Canyon has hookups, but is very hard to get into, especially when the wildflowers are blooming (End of Feb. - March). Nice CG. Make reservations as soon as you know. Otherwise there are a couple RV resorts in Borrego Springs and limited dry camping areas in the state park.
Anza-Borrego Desert State Park(R) does have hook-ups at the Borrego Palm Canyon campground. You may make reservations thru www.reservecalifornia.com.
I'd say 99% is dry camping.
There are hookups in select camps. Most are "primative camps" meaning no hookups
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