TXU’s “Free Nights & Solar Days 18” is the most expensive Time-of-Use electricity plan we currently track, costing the average homeowner nearly double the best fixed-rate plan.
Lately you can’t watch TV for an hour without seeing a commercial for this plan. It touts “free” electricity from 9 p.m. until 6 a..m., with the rest as renewable solar and wind. Together, that’s the trifecta of red flags in our “How to Shop for Electricity in Texas” article. But let’s start with the math…
For simplicity, we took TXU’s own EFL usage and average price claims at face value. Then we compared them to the cheapest 18-month, fixed-rate, 100%-renewable plans on PowerToChoose.org using our RateGrinder tool, including typical month-to-month usage variations:
| TXU Free Nights & Solar Days (DFW/Oncor area) | |||
| Avg monthly usage (kWh) | |||
| 500 | 1000 | 2000 | |
| Average rate (¢/kWh) | 15.2 | 13.7 | 12.9 |
| 18-month cost | $1,368 | $2,466 | $4,644 |
| – Lowest-cost fixed-rate competitor | $707 | $1,318 | $2,544 |
| = TXU cost premium | $661 | $1,148 | $2,100 |
| +93% | +87% | +83% | |
Like most “free” weekends/nights plans, TXU’s Free Nights & Solar Days jacks up the base rate more than enough to compensate for the free periods. In this case, it’s upwards of 18.5 ¢/kWh after TDU charges. For comparison, the best alternatives above averaged <7.7 ¢/kWh annually. So a house that averages 1000 kWh/month usage would pay an extra $1,148 over 18 months. If you try to change your mind, you’ll encounter a $295 cancellation fee, the highest of any 18-month plan we currently track.
Can savvy consumers make up the difference by deferring their electricity usage until the free periods? Not likely. As the largest electricity retailer in Texas, TXU knows how much their customers use from 9 p.m. to 6 a.m. Their EFL “average rate” math above already assumes 32.7% is free. Their press release claims “customers on these plans received nearly 40 percent of their energy usage for free”1. But even that extra 7.3% barely dents the 83%+ cost premium.
Think you’re up for deferring YOUR usage enough to come out ahead? It is theoretically possible.
But you’ll be plenty hungry waiting in the dark until 9 p.m. to cook canned soup for dinner because you have no fridge or freezer. And without AC your stagnant, algae-filled backyard pool will offer little relief from the Texas heat. Get the picture? Yes, your dishwashing and laundry can be put off until nighttime, but that difference is relatively small. If you really want to do the math on your house’s usage, we’ve posted a tool to help in our “Indexed and Time-of-Use Plans Roundup“.
Finally, TXU has added “Solar Days” to their prior Free Nights offering, via purchases of solar power and solar and wind renewable energy credits (RECs). But as “Green Energy Plans: The Reality” notes, RECs in Texas are sadly too cheap to do much more than boost retailer profits. Perhaps TXU’s “purchases of solar power” include more meaningful Power Purchase Agreements with generators, but that information is lacking. (If so, we welcome TXU to provide details in the comments below.)
Don’t pay the price for marketing gimmicks like Free Nights & Solar Days. To find the lowest cost options for your home, just plug your monthly electricity usages into TPG’s RateGrinder tool. You won’t find a cheaper rate easier anywhere else.


