TRON error: Out of energy (OUT_OF_ENERGY)

Why it happens

• The account had no free Energy left (600 Energy per day from staked bandwidth) and not enough TRX to burn.
• The contract (often a USDT transfer on a busy day) needed more Energy than the estimated allowance.
• The receiver's USDT address had never been touched, so the transfer had to initialise storage — roughly 3× the Energy of a normal transfer.
• Energy delegation expired or the staked TRX was withdrawn before the transaction landed.

How to fix it

1. Stake more TRX for Energy, or keep a buffer of TRX so the burn can cover the shortfall.
2. Ask the receiving address to make one small USDT transfer first — after initialisation, transfers cost far less Energy.
3. Delegate Energy to the sending address instead of relying on the free daily quota.
4. Retry after a few minutes: TRON Energy prices swing with the chain's activity (dynamic Energy model).

What it looks like in the wallet or explorer

receipt: OUT_OF_ENERGY · energy_usage_total 130,000 · fee 27.7 TRX