What the LG LDFN343** costs to run
The LG LDFN343** is certified by ENERGY STAR at 238 kWh a year, about average for its category to run among dishwashers currently certified.
That $45 is priced at 18.8¢/kWh, the average of all 51 state rates this site tracks. Your own state's rate is one click away.
Efficient, or not, for a dishwasher
The category average is 232 kWh/yr; this model runs 2.6% above it, ranking 299 of 737 dishwashers tracked here for running cost. That average is drawn from all 737 dishwashers ENERGY STAR currently certifies, not an outside number, a $1/year gap from this model at the national rate. Full sourcing is in the sourcing notes.
Right next to it on the list
A rank or two either side of the LG LDFN343**: LG LDFC353** ($45/yr, 238 kWh/yr), then LG LDFN454** ($45/yr, 238 kWh/yr).
Same brand, different models
Ranked 23 of LG's 38 certified dishwashers, this sits between the LDNFC33L* ($41/yr, the brand's cheapest) and the SDWD24** ($45/yr, its priciest).
What this adds up to over time
Over the 9-year service life NAHB reports for this category, running the LG LDFN343** costs roughly $403 in electricity, separate from the purchase price.
Is it worth replacing?
Efficient as certified dishwashers go, $45/year is a reasonable baseline if you're comparing what else is on the market.
Compare current ENERGY STAR certified dishwashers before buying.
If you're keeping it
The LG LDFN343** already costs $45/year to run; a repair bill on top of that is the kind of expense a protection plan exists to smooth out.
Where this number comes from
Two sourced numbers, nothing modeled: ENERGY STAR's certified kWh/yr for this exact model, and EIA's published state electricity rate. The full Dishwasher category page shows all 737 dishwashers ranked by cost; the state-rate guide covers the half of this number that isn't the appliance.