这是现在分词作定语。suppling approximately 20%=which supplied approximately 20% of electricity
By 2000, coal had become the fuel for more than 75% of electricity proced and only hydro continued to be another significant source suppling approximately 20%.
截至2000年,煤炭发电占总电量的75%以上,只有水电继续充当另一重要资源,提供了总电量的大约20%。
你的理解正确。
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