The utility argues it would reduce greenhouse gas emissions.
More than 4,800 gallons have leaked since Monday.
Gas prices have come down an average of 18 cents from a week ago, and about 33 cents from one month ago, according to twincitiesgasprices.com. The cheapest gas is in Bloomington (more than a dozen stations had gas in the $3.23-3.29 range.) The three most expensive stations were in South St. Paul ($3.99), North St. Paul ($3.98) and Minneapolis ($3.74).