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High current when connect to zigbee network.

My device is powered by an electromagnetic field from the 10 kilovolt line, which cannot deliver much power. When connected to a zigbia network, nrf52840 consumes too much (about 12 mA). For tests, I am using the code from the light switch example. I reduced the tx power (nrf_802154_tx_power_set(-40)), turned off the log in config, turn on DCDC.But to work at an acceptable level of primary current for me on the side of 10 kilovolts, too much capacitance is needed (about 1 farad), which significantly affects the size of the device. How to reduce the current when sending a beacon? After starting, the current is about 900 microamperes, which is acceptable for me (I measure it with an ordinary multimeter, probably it's some kind of average, since the controller should go to sleep). Thanks

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