The True Electricity Cost of Rendering on Your Own Workstation
Nobody buys a GPU thinking about the electric meter, and that is fine when you render an hour here and there. The cost only becomes visible when you start running long animations or heavy stills regularly, because power scales with hours, and a render rig at full tilt is one of the hungriest things in the house. The number is not enormous on its own, but it is real, it recurs every month, and it usually travels with a second cost most people forget entirely.
| Setup under render load | Power draw (at the wall) | Hours / month | kWh | Cost (sample rate) |
|---|---|---|---|---|
| Single RTX 4090 workstation | ~600 W | 250 | ~150 | ~22 USD |
| Dual GPU workstation | ~1,100 W | 250 | ~275 | ~41 USD |
| Add cooling for the heat | +15 to 30% | 250 | extra ~40 to 80 | +6 to 12 USD |
| Heavy month, dual GPU | ~1,100 W | 400 | ~440 | ~66 USD plus cooling |
How do I calculate my render power cost?
The formula is short. Take the machine’s watts under load, divide by 1000 to get kilowatts, multiply by the hours you render, and multiply by your local electricity rate per kWh. A 600 watt machine running 250 hours is 0.6 times 250, so 150 kWh, and at a sample rate that lands around 22 dollars for the month on that one machine alone. Swap in your own electricity price, because the bill follows your local rate, not the sample one.
To measure your real draw rather than guess, a cheap plug-in power meter between the wall and your machine shows the actual watts while a render runs, which is usually higher than people expect under sustained load. Use that real number, because the card’s rated TDP and what the whole system pulls at the wall are not the same thing, and the wall figure is what your meter charges you for.
The cost hiding behind the power cost
Electricity is only half of it. Every watt your machine draws becomes heat, and that heat has to go somewhere. In a small room or a warm climate, a render rig at full load turns your office into a sauna, and the air conditioning runs harder to compensate, which is more electricity on top of the render itself. I have sat through summer renders where the AC bill climbed as much as the machine’s own draw, so the real power cost of rendering was close to double the GPU figure.
There is noise and wear too. Fans screaming for hours, components running hot and aging faster, a workstation you cannot comfortably sit next to. These do not show on the electric bill, but they are part of the true cost of doing all your rendering on a box in your room.
When cloud is the cheaper watt, and when it is not
Power deserves a fair hearing, because it is the one area where owning can genuinely win. If you render heavily almost every day, year after year, the electricity you pay directly can work out cheaper than a cloud rate, which bundles power, cooling, hardware, and a margin into one number. At that volume, your own machine in a place with cheap electricity is hard to beat on raw energy cost, and in Vietnam, where residential rates are low, that case is stronger than in many countries.
For everyone else, the spiky users, cloud rendering quietly removes this entire category. You pay a rate that already includes the power and the cooling, you do not run your own AC to fight the heat, and your machine is not aging in the corner. With iRender you rent a full RTX 4090 workstation with 256GB of system RAM, set it up as your own, and the render matches your local result because you control the environment, which is the point of “your renders, your rules.” There is one caveat that bears directly on the power story: because billing runs from the moment the server powers on, a forgotten idle machine quietly burns the very savings you came for, so auto-shutdown is not optional here, it is the whole point. The first setup also takes a little time before your saved image launches fast. If pure hands-off batch is all you want, a SaaS render farm is an option too.
