NOPEC said purging 550,000 electricity customers won’t drive up prices for Ohioans, and doesn’t break any rules, in a filing to state regulators this week. The Northeast Ohio Public Energy Council, the default electricity supplier for most of Greater Cleveland, is defending its right to do business in Ohio. The Public Utilities Commission of Ohio directed NOPEC to show cause and explain why its certificate to do business should not be revoked on Sept. 7. The filing late Wednesday is the latest chapter in a book’s worth of legal filings, all stemming from NOPEC’s decision to temporarily drop about 97.5%...