half/both of是前位限定词吗

At least half of the electricity transported via newly-built powertransmission channels should be renewable.

请问这个句子中的half of the electricity除去将half剖析为代词，是否还可以将half of剖析为前位限定词，同理当出现both of时是否也可以剖析为前位限定词？

At least half of the electricity transported via newly-built power transmission channels should be renewable.

限定词还能接 of 吗？明明是代词，both of...也是这样。其他限定词接了 of 后，也都变成了代词。比如：

all of..., some of..., many of..., much of..., any of... , several of..., a few of..., a little of... 等。