In 1975 the Hubbard Lake Substation was constructed.
In 1976 the Abitibi (now DPI) Substation was constructed to serve the increased load at the plant.
In 1978 the Norway Substation was constructed.
In 1979 the Bagley Street Substation was constructed.
In 1980 the Rockport Substation was constructed.
Also in 1980, the first Energy Thrift Note (similar to a certificate of deposit) was issued. APC was one of two utilities in the U.S. to offer such notes to their customers.
In 1980 APC had about 13,500 customers.
In 1985 APC donates 6,600 acres in the Fletcher Pond area to the Thunder Bay Audubon Society. The pond has the largest Osprey population east of the Mississippi River.
In 1986 the Potter Field Substation was constructed. This increased APC's energy capacity to 158 megawatts.
In 1989, a mural depicting APC's history was painted on APC's main office building by a local artist.
On August 31, 1990, all hydro electric generation power plants and associated lands and facilities were sold to Thunder Bay Power Company. These included Ninth Street Dam, Four Mile Dam, Norway Point Dam, Hillman Dam, Hubbard Lake Reservoir Dam and Upper South Reservoir Dam.
In 1990 APC had about 13,900 customers.
In 1993 the Progress Street Substation was constructed to improve power quality and reliability for APC's customers in Hillman. This increased APC's energy capacity to 170 megawatts.
Also in 1993, the North Side rebuild project, which converted the existing 4,160 volt system to 13,200 volts, was completed. The project was started in 1986 and cost more than $1,000,000. The Long Lake Substation was decommissioned as part of the project.
In 1994 APC entered into a 30 year agreement to purchase power from Consumers Power Company (now Consumers Energy).
In 1996 the Central Substation was constructed to eventually replace the lower voltage Ninth Street Substation.
Between 1996 and 2004 capacity is increased at eight substations to enable APC to serve its customers' growing demand for electricity.
In 1999 the North Industrial Substation was constructed.
In 2000 the M-32 Substation was constructed.
In 2000 APC had about 15,400 customers.
In 2001, the South Side rebuild project, which converted the existing 4,160 volt system to 13,200 volts, was completed. The project was started in 1995 and cost more than $1,700,000.
In 2002, Voltage conversion of the center and southside of the city of Alpena was completed, Central substation in full service at 13,800 volts. Ninth Street 4,106 volt distribution substation decommissioned.
In 2003, Phase one of the SCADA system (remote monitoring & control of substations) was completed, with all substations connected to the Operation center. Phase two started, where additional equipment will be installed to monitor all individual distribution circuits.
In 2004, Hospital substation upgraded with new reclosers, switchgear, and an improved connection to an alternate source of energy from an adjoining distribution circuit with automatic transfer equiptment. A new recloser and three voltage regulators were added to Rockport substation.
2003 - 2005, APC's energy capacity was increased to 202 megawatts with installation of new 40 megawatt transformers at Gennrich and Potter Field substations, and the replacement of transformers at 4-Mile substation. A new 138 k V SF6 gas circuit switcher and control relays were added to Gennrich substation for protection of transformer #2.
In 2006, Two more distribution circuits were added to the North Industrial Park substation to better serve the loads there. The first of five 34.5 kV circuit breakers (1956 vintage) was replaced at 4-Mile sub. The rest will be replaced in the next few years. A new 138 kV SF6 gas circuit switcher and control relays were added to Genrich substation for protection of transformer #1. Ninth Avenue garage was renovated to provide additional office space. All employees now are located at that facility.
In 2007 APC had about 16,300 customers. A new 138 kV SF6 gas circuit switcher and control relays were added to Potter Field substation for protection of the transformer. A fifth distribution circuit was installed at South substation and a portion of the distribution line for this circuit was rebuilt with larger conductor, to better serve the commercial loads on the south side of Alpena.
2008-2009, Replaced four manually-operated 138 kV air break switches at Gennrich substation with four new motorized switches. All 138 kV bus insulators were replaced at the same time.
In 2009, Replaced two more 34.5 kV circuit breakers at 4-Mile substation. Rebuilt the ATI substation and instlled a new 34.5 kV recloser.
2009-2010, Started what will be a multi-year project to replace the aging 34.5 kV sub-stransmission lines. The first line to be replaced was the tie between 4-Mile and Norway point substations, which was relocated to Long Rapids Road. This will make it easier to maintain than the old line which crossed the river twice. The replacement of the Industrial tie between Gennrich and Potter Field substations was started in 2010.
2010, Completed replacement of all control systems at Potter Field substation with microprocessor-based relays. Started replacement of the control systems at Gennrich substation with the same type of equipment. Project to be completed in 2011.