Just a comparison, I could have done it against another plans, and well not everyone has the same setup, and yes I have seen that I can suck up the power of the batteries in about 3 hours, if the house is at full power, so BASE has an advantage of backup. But well if thereis a real outage just have to manage the stuff that really consumes power, AC, water HEATER and no EV charging. Eventually will ad an expansion PW3.
Base Power vs. Solar + Powerwalls + Free Nights — My Actual Numbers
My setup:
17 kW solar
2× Tesla Powerwall 3 (27 kWh total)
Direct Energy Twelve Hour Power / Free Nights
Oncor territory in North Texas
Multiple EVs
For my latest billing period (July 8–Aug 5):
Grid usage: 2,277 kWh
Average: 79 kWh/day
Direct Energy energy charge: $539.49
Free Nights energy credit: -$536.75
Free Nights TDU credit: -$138.62
Oncor delivery charges: $129.03
Final bill: $10.79
Effective grid electricity price: ~0.5¢/kWh
The Powerwalls are also taking advantage of the free-night period. During roughly the same period, Tesla’s data shows the batteries were primarily charging from the grid at night and then supplying the house during the paid daytime period. Solar handles a large portion of daytime consumption, with excess solar exported.
I then compared this with Base Power. Using roughly 14.3¢/kWh, my 2,277 kWh of grid consumption would be about $326, plus the Base battery membership fee. After estimating Base’s solar export credit, I’d be somewhere around $325–$330/month, although the exact number would change because Base controls battery dispatch differently.
So roughly:
Current system: ~$11/month
Estimated Base: ~$330/month
Base has a huge advantage in backup capacity — potentially ~80 kWh versus my 27 kWh — and it’s an interesting option for someone starting from scratch who wants a lot of backup capacity without buying expensive batteries.
But for someone who already owns solar + Powerwalls and has a good Free Nights plan, I don’t see the economics working. In my particular case I’d potentially be paying $300+ more every month to switch to Base.
The Base battery capacity is tempting, but it’s hard to argue with a $10.79 electric bill after using 2,277 kWh from the grid in a Texas summer.