Electricians charge between $50.00 to $150.00 per hour for the job plus a service call of around $100.00
It may take around 8 hours to remove the old electrical panel and then wire in the new electrical panel so it could cost from $800.00 to $1,000.00 for a qualified electrician to replace the electrical panel.
Some electricians may also charge a certain fee for replacing only electrical panels and they may charge as high as $2,000.00 to $4,000.00 so it's best to get some quote from different electricians before you have the job done.