I have a solar system, yet I was able to cut my pump electricity costs IN HALF from around $1400 to $700 per year (at high marginal 40 cents per kilowatt-hour rates) when I switched from a 1 HP (1.65 SF) Jandy HHP pump and a 3/4 HP booster pump (for the Letro Legend pool sweep) to an IntelliFlo VF pump. Most of the savings comes from the fact that even when I'm using solar, it isn't on for all 8 hours of pump run time. It's only on for 4-6 hours so the other 2-4 hours I'm able to run at a lower 26 GPM, 1500 RPM, 275 Watts. Even when the solar is on, I can run at 48 GPM (4 GPM per panel for 12 panels), 3000 RPM, 1500 Watts with greater efficiency than my old pump which was running at around 55 GPM (maybe 1800 Watts) or so when the solar was on (and 80 GPM or so when the solar was off, still close to 1800 Watts). The rest of the savings was using the IntelliFlo to power The Pool Cleaner at 15 GPM, 2200 RPM, 540 Watts through its dedicated line compared to the 3/4 HP booster pump at around 1400 Watts.

Richard