For all of Silicon Valley ‘s professed support for clean power over fossil fuels

参考译文：尽管硅谷对清洁能源的大力支持超过了对化石燃料的支持。

For all of Silicon Valley ‘s professed support for clean power over fossil fuels（让步状语）//,the energy industry（主语）// represents（谓语动词）// a huge opportunity（宾语）.

尽管硅谷对清洁能源的大力支持超过了对化石燃料的支持，但能源行业代表着一个巨大的机遇。

结构为：For A's support for B over C 意思“A对B的支持超过了C”

(1)for all 尽管；虽然相当despite 

For all its clarity of style, the book is not easy reading. 

这本书虽然文体清晰，但读起来并不容易

(2)over prep.在..方面超过/胜过

They are deliberately flouting the law in order to obtain an advantage over their competitors.

他们为了和竞争对手抢夺先机而公然无视法律。

For all of （就...来说）Silicon Valley ‘s frofessed （应该是 professed 吧） support for clean power over (超过)fossil fuels,the energy industry represents a huge opportunity.

就硅谷对清洁能源的支持超过了对化石燃料的支持的情况来说， 能源行业代表着巨大的机遇。