Mandatory evacuation orders affected more than one million people, but there are fears for up to 90,000 people across Texas who officials say decided to brave out the storm.
In Galveston, an estimated 23,000 residents stayed behind.
President George W Bush, who earlier declared a federal emergency in Texas, said the federal and state authorities would conduct the recovery effort together, bringing in generators and ensuring water and ice supplies.
US Homeland Security Secretary Michael Chertoff is due to arrive in Texas on Saturday, weather conditions permitting, he added, speaking at the White House.
The US Environmental Protection Agency has waived federal clean air regulations for petrol sold in states affected by the storm, in an effort to reduce fuel disruption.
Ike has halted more than a fifth of US oil production, forcing 17 refineries in the Gulf of Mexico to shut down as a precaution.
Rain and debris
Jessica Willey, a journalist based in Galveston which lies on a small island off the coast of Texas, told the BBC it was the worst storm she had ever seen:
See the likely path of Hurricane Ike through the US
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