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The power converters mod will directly convert factorization charge power. The same mod can also be used to convert the steam produced by the solar boiler. Lacking anything other than mj or eu mods, one can pipe the steam into various steam engines for MJ or turbines for EU.
You'll need three blocks in power converters like Siro said, a consumer (steam more than likely in your case), energy bridge, and a producer (what type you want to turn it in to)