How much did the servers in GIGAZINE's data center running Tesla 'Powerwall' save in 2025?
The home battery 'Powerwall' sold by electric car manufacturer Tesla is a device that stores surplus electricity obtained from solar power generation systems and automatically supplies electricity to the home when a power outage is detected. Since securing electricity is of the utmost importance at the in-house data center of the GIGAZINE editorial department, which runs servers 24 hours a day, 365 days a year, solar panels and a Powerwall were
On December 19, 2025, I opened the official Tesla app to check the status of my Powerwall, and a report was automatically generated showing how much I'd saved throughout 2025, so I've summarized the results here.
Powerwall – Home Battery | Tesla Japan
https://www.tesla.com/ja_jp/powerwall
Over the course of a year, the Powerwall stored 130.5 kWh of electricity.
If the stored 130.5kWh is used to power a smartphone, it can operate for 14 years.
The Powerwall apparently saved about 152,079 yen on electricity bills, which puts it in the top 1%.
The solar power generation capacity in 2025 was 6.7MWh.
To generate this much electricity, solar power generation would need to run for 13 months.
It appears that 42% of electricity usage in July 2025 was covered by solar power. Covering just under half with solar power seems like a fairly large percentage.
The day with the most solar power generation was May 14, 2025, when 66% of electricity consumption was covered.
The period during which they went without purchasing electricity from the power company was 12 days.
The electricity self-sufficiency rate for fiscal 2025 was set at 30%.
The lowest daily electricity usage was 46.3kWh.
The most common day was 74.8kWh.
GIGAZINE's power consumption seems to be classified as ' energy saving master ' within the top 1% among Tesla energy owners.
Finally, a summary was displayed.
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