Colonial Gas Company Announces Commencement of Consent Solicitation relating to its 8.80% First Mortgage Bonds Series CH due 2022, 7.38% First Mortgage Bonds Series A-1 due 2025, 6.90% First Mortgage Bonds Series A-2 due 2025, 6.94% First Mortgage Bonds Series A-3 due 2026 and 7.12% First Mortgage Bonds Series B-1 due 2028