Staking TRX for Energy
Staking, officially called freezing on TRON, is the standard way to get a recurring Energy allowance instead of paying a TRX cost on every single transfer.
What staking actually does
When you freeze TRX, that amount is locked and, in exchange, grants your account a share of Energy (or Bandwidth, depending on which resource you choose to stake for) that renews on a daily cycle, rather than being consumed permanently per transaction.
How much to stake
The exact Energy granted per TRX staked depends on overall network conditions, since it's a share of a total pool. Frequent USDT senders generally stake enough to comfortably cover their typical transfer volume, checking their actual Energy allowance afterward to confirm it matches their needs.
The trade-off
Staked TRX isn't immediately liquid — unstaking it takes a waiting period before it's freely available again. This makes staking most worthwhile for TRX you don't need immediate access to and for accounts that send USDT regularly enough to make the ongoing savings worth that trade-off.