I have looked at IR2030 (Page 23) and also the frequency plan for EU863-870 …
The short summary is that there is one of the frequencies (869.525 MHz) that Gateways can use to transmit Downlink messages (RX2) where it is permissible to go to 27bBm on this frequency. The other frequencies are all 14dBm.
It is always 14dBm for nodes transmitting on all of the frequencies.
Frequency plan for LoRaWAN is United Kingdom (UK) EU863-870
Uplink: (i.e. LoRaWAN node transmitting to a gateway)
868.1 - SF7BW125 to SF12BW125
868.3 - SF7BW125 to SF12BW125 and SF7BW250
868.5 - SF7BW125 to SF12BW125
867.1 - SF7BW125 to SF12BW125
867.3 - SF7BW125 to SF12BW125
867.5 - SF7BW125 to SF12BW125
867.7 - SF7BW125 to SF12BW125
867.9 - SF7BW125 to SF12BW125
868.8 - FSK
Downlink: (i.e. a LoRaWAN gatetway transmitting to a node)
- Uplink channels 1-9 (RX1)
869.525 - SF9BW125 (RX2)
So a LoRaWAN gateway CAN transmit on 869.525 MHz.
From Ofcom document IR2030 (Published May 2020) (https://www.ofcom.org.uk/__data/assets/pdf_file/0028/84970/ir-2030.pdf)
On page 23 we can see …
The Downlink frequency of 869.525MHz does fall within the frequencies highlighted in yellow above (i.e. 869.40 – 869.65MHz) and the Maximum Transmit Power is defined as 500mW e.r.p (or 27dBm).