Appalachian Power rates are going down. The State Corporation Commission says it’s adjusting rates due to the federal corporate income tax rate reduction. Appalachian Power reduced its rates by $50 million last July and those are going down another $30 million. Corporate income taxes make up only a portion of a typical customer’s bill. Residential customers using 1,000 kilowatt-hours a month saw a reduction in their bills of approximately $4.83 based on the rate that was implemented in July, according to the company. That rate dropped on Monday.