According to the rules, as a brotherhood of psykers they are required to have 1 power. However, psychic powers are normally only generated before deployment. There is no straight answer here, but most people and tournaments go with them being able to generate a power before being placed on the table. This is definitely something GW should have FAQ'd months ago, but I've been waiting for some FAQs being answered since the beginning of 6th, so don't hold your breath.
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