| 1932 | Election of FDR |
| 1935 | National Labor Relations Act enacted |
| 1936 | Re-Election of FDR |
| 1938 | P.U.C.H.A. passed |
| 1940’s | Utility Workers Organizing Committee |
| 1941 | Industry Nepotism |
| 1943 | Local 223 Organizing starts by bargaining units |
| Substations Organized |
| Conners Creek Organized |
| Trenton Channel Organized |
| Underground Lines Organized |
| Construction & Maintenance Organized |
| Shops Division Organized |
| Buildings & Properties Organized |
| Marysville Organized |
| Delray Organized |
| Motor Transportation Organized |
| 1944 | Meter Reading Organizes |
| 1945 | World War II ends |
| 1947 | Company strategy to keep union divided |
| 1950 | Detroit Edison construction phase starts |
| 1951 | Stores Division leaves I.B.E.W. |
| 1953 | Stores Division votes to join Local 223 |
| 1955 | AFL & CIO Merge to strengthen unions |
| 1956 | Central Heating Organizes |
| 1957 | Lay-off construction |
| 1959 | Landrum Griffin Act passed |
| 1960’s | Residential growth |
| St. Clair Organizes |
| Civil rights movement |
| 1963 | Fermi I’s first sustaining chain reaction achieved |
| 1965 | The War in Vietnam escalates |
| Mass Hiring at Detroit Edison |
| 1966 | Strike and lost C.O.L.A. |
| River Rouge Organizes |
| 1967 | Suburban Growth |
| Fermi I suffers a partial meltdown |
| 1968 | Harbor Beech & Meter Department Organize |
| 1969 | Strike – Local 223 gets C.O.L.A. back |
| Gas deregulation |
| 1970 | Started construction of Fermi II |
| Discrimination Lawsuit against Detroit Edison and Local 223 |
| 1971 | Monroe Organizes |
| NLRB adopts Collyer Policy |
| Construction and Maintenance split into separate units |
| 1972 | Fermi II Organizes, bidding limited |
| One Week Strike over T-10’s |
| Nixon re-elected ( Richard not Hal) |
| 1973 | Energy conservation |
| Oil Crisis |
| 1974 | Coalition of Labor Woman formed |
| Employment Retirement Security Act passed |
| 1975 | 3 Year Contract Agreement Reached |
| 1978 | 3 Year Contract Agreement Reached |
| 1979 | Environmental standards |
| Three Mile Island Incident |
| 1980’s | Minority hiring |
| Wildcat strike at Monroe |
| 1980 | Joyce Miller is first woman elected to AFL/CIO Executive Board |
| 1981 | 3 Year Contract Agreement Reached |
| Union dropped from discrimination suit |
| 13,000 PATCO Members fired |
| 1983 | I.B.E.W. Local 17 contract settlement |
| 1984 | Seven week strike over Health Care cost sharing |
| 3 year Contract Agreement Reached |
| 1987 | 2 year Contract Extension Reached |
| 1989 | 3 year Contract Agreement Reached |
| Electric Industry Deregulation surfaces |
| Construction Division dissolves into Substation and Maintenance |
| 1990 | Macomb Headquartered employees Organize |
| 1991 | Large buy out resulted in membership deduction |
| 1992 | The Year of Not Contract negotiation reaches impasse |
| Company imposes their proposals. |
| Union works without a contract. |
| 1993 | Bill Usery attempts to build relationship between Union & Company |
| Usery assists in reaching 2 year Contract Agreement |
| 1994 | 1st OPT Contract, one year Agreement Reached |
| Grievance load falls from 1200 to over 100 due to the new Union/Management Relationship. |
| 1995 | Contract expires and new form of contract negotiations (IBB) is used |
| First ever 4-year agreement is ratified. |
| 1996 | Beginning of Partnership activities |
| 1997 | Maintenance and Production Divisions form Power Generation Division per 1995 agreement. |
| 1998 | 3 year Contract Extensions offered. |
| OPT accepts extension |
| Trades reject extension |
| Union lobbies for fair deregulation bill. |
| Unprecedented Successor Clause negotiated. |
| First ever Local 223 Offsite Conference for General Council members at Treetops Resort in Gaylord. |
| 1999 | Historical 5 year Contract Agreement. |
| Office of Labor Management partnership is created. |
| 2000 | State of Michigan passes Utility Deregulation Bill |
| Local 223 Major Player in Deregulation Bill |
| First ever Steward Training classes designed for Local 223 Stewards based on Local 223 Agreement and History. |
| Classes Presented by Local 223 Executive Board at three locations to nearly 300 stewards. |
| 2001 | Local 223 Organized the first work group outside the Greater Detroit area adding members from Grand Rapids and Traverse City to the OPT Bargaining Unit. |
| 2002 | Local 223 signed an agreement to represent workers at a Co-Generation Plant in East China Michigan. |
| Just under 1000 members of Local 80 of the Service Employees International Union Voted to join Local 223. This Unprecedented merger was brought about by hard work and dedication of the executive boards of both Local 223 and Local 80 as well as the cooperation of the National SEIU and UWUA leadership. |
| Workers from the General James M. Gavin Power Plant at Cheshire, Ohio voted to become members of Local 223. |
| This was the first ever Local 223 work group organized outside the State of Michigan. |
| 2005 | On May 19th Local 223 moves into new Union Hall in Dearborn. The new facility is located in the Fairlane Industrial Park on 15160 North Commerce Road off Greenfield Between Rotunda and Michigan Ave. |