Netzero What’s New - August 2026

This is the August 2026 update covering new Netzero features, Powerwall firmware observations, and user-reported issues. To manage your email update preferences, go to Settings > Preferences in the Netzero app. We will send at most one update per month.

For past updates, see Netzero Updates.

One Year of Subscriptions

Netzero subscriptions launched on August 1, 2025. Thank you to everyone who subscribed! Your support funded our development and everything shipped in the last year, over 100 features and improvements across nearly 40 releases. The major changes:

• Powerwall grid export: discharge stored energy to the grid, from an automation or by hand.
• Simpler diagnostics: battery capacity, degradation, and solar string data without connecting to the Powerwall Wi-Fi, so diagnostics also work away from home and in the web app.
• Health monitoring: battery fault alerts, system alerts, and more Powerwall data such as pack temperature and round-trip efficiency.
• Energy devices: connect EVs, EV chargers, and heating and cooling systems, with support for over 500 devices from more than 50 brands, and a Devices screen that brings them together.
• Intelligent Octopus Go: faster Powerwall charging with Backup Mode, support for Ohme chargers, Charge Cap and the 6-hour limit.
• Powerwall Pairing and Go Off-Grid automations: pair the app with your Powerwall for a secure local connection, then go off-grid from an automation to avoid negative export prices or demand charges.

We also published the second Analysis of Powerwall Battery Retention, based on anonymized Netzero diagnostics data.

There is much more to come: new features and improvements to the app every month, and more published research based on anonymized Netzero data.

New since the July update

Powerwall Grid Export

You can now discharge stored Powerwall energy to the grid, either from an automation or manually. This is useful for exporting during a high export price window, or for emptying the battery before a period of cheap or free electricity.

Add the Powerwall grid export action to an automation, or start an export by hand from the Powerwall grid export card under Automation > Configuration. Tesla offers no direct control over battery export, so Netzero uses a temporary rate plan, and the Powerwall takes a few minutes to react. The backup reserve is not changed and acts as the floor that exports stop at.

See Powerwall Grid Export for details.

System Alerts

The Powerwall system reports hundreds of internal condition codes. Netzero now shows a selected set of them under Devices > Alerts and sends a notification when one appears, for example a Powerwall breaker open, a lost connection to a Powerwall, or a solar inverter that stopped reporting.

The new Powerwall System Alerts page lists every condition Netzero reports, with its firmware code, a description, and the share of systems currently reporting it.

More Powerwall Diagnostics

Devices > Overview now shows, per Powerwall, the battery pack temperature range, the round-trip efficiency (the share of energy charged into the Powerwall that comes back out), and the lifetime energy charged and discharged.

Other Changes

• Storm Watch triggers: two new automation triggers, When Storm Watch activates and When Storm Watch deactivates. Together with the Run during Storm Watch events option added in July, this lets you restore your own settings once a Storm Watch event ends.
• Year-over-year charts: every chart now has a year-over-year section under it in the day, month, and billing month views, comparing the period on screen with the same period a year earlier.
• Chart drill-down: press and hold a bar in the month or year chart, then tap View Day or View Month. In the web app, click the bar.
• Rename automation groups from the group header.
• Weather details: tap the weather icon in the Day view.
• Utility rate plan update notifications can be turned off under Settings > Notifications.

Intelligent Octopus Go (UK) - Powerwall charging follows your EV

On the new Intelligent Octopus Go with the 6-hour limit, which most Intelligent Octopus Go customers were moved to in late August, a smart charging slot outside 23:30-05:30 gives your home the off-peak rate only when the EV is actually drawing power. Netzero now follows the same rule: Powerwall charging starts once the EV is drawing power, rather than as soon as a slot appears on the schedule. If the car finishes early, is unplugged, or never starts, Netzero may not charge the Powerwall for some or all of the slot, and during a long slot the Powerwall may stop and start again, following the car. See Powerwall charging follows your EV for details.

Powerwall Firmware Updates

Powerwall firmware updates are managed and deployed by Tesla. As of early September 2026, the 26.26 series has largely replaced 26.18.3 on both Powerwall 2 and Powerwall 3. 26.26.5 is the newest version and is just starting to roll out. For detailed tracking data, see Powerwall Firmware Versions.

In July we noted the first Powerwall 2 systems requesting a battery calibration. Since then, we have been seeing more Powerwall 2 calibrations.

Netzero now sends a notification when a calibration is observed on a Powerwall 2 or Powerwall 3. This is a routine Tesla maintenance cycle and no action is needed; the notification explains why the Powerwall may unexpectedly charge or discharge.