Three Mile Island 1

Permanent Shutdown

Details

Reactor Type	Pressurised Water Reactor (or PWR)
Model	B&W; (L-loop)
Owner	Exelon Corporation
Operator	Exelon Generation Co., Llc

Timeline

Construction Start	Saturday, 18 May 1968
First Criticality	Wednesday, 5 June 1974
First Grid Connection	Wednesday, 19 June 1974
Commercial Operation	Monday, 2 September 1974
Permanent Shutdown	Friday, 20 September 2019

Specifications

Capacity Net	819 MWe
Capacity Gross	880 MWe
Thermal Capacity	2568 MWt
Design Net Capacity	819 MWe

Operational History

Electricity Supplied (GWh)

Energy Availability Factor (%)

Total Electricity Supplied (GWh)

Reactor History

Year	Reference Unit Power (MWe)	Annual Time Online (Hours)	Electricity Supplied (GWh)	Operation Factor (%)	Energy Availability Annual (%)	Energy Availability Cumulative (%)	Load Factor Annual (%)	Load Factor Cumulative (%)
1974	792	3651	2450.20	88.20	88.20	88.20	85.90	85.90
1975	792	7198	5541.60	82.20	79.70	81.80	79.90	81.40
1976	792	5745	4344.40	65.40	62.50	73.50	62.40	73.30
1977	792	7087	5466.60	80.90	78.70	75.10	78.80	74.90
1978	788	7454	5681.90	85.10	82.00	76.70	82.30	76.60
1979	776	1128	888.70	12.90	12.90	64.90	13.10	64.90
1980	776	0	0.00	0.00	0.00	54.80	0.00	54.80
1981	776	0	0.00	0.00	0.00	47.40	0.00	47.40
1982	776	0	0.00	0.00	0.00	41.80	0.00	41.80
1983	776	0	0.00	0.00	0.00	37.40	0.00	37.30
1984	776	0	0.00	0.00	0.00	33.80	0.00	33.70
1985	776	1853	811.66	21.20	37.80	34.10	11.90	31.80
1986	776	6209	4818.26	70.90	70.80	37.10	70.90	35.00
1987	776	6351	5034.31	72.50	72.50	39.70	74.10	37.90
1988	808	6679	5465.43	76.00	76.00	42.20	79.40	40.80
1989	808	8714	7216.78	99.50	99.50	46.10	102.00	44.90
1990	808	7123	5316.18	81.30	81.80	48.40	75.10	46.80
1991	808	7536	5671.23	86.00	86.40	50.60	80.10	48.80
1992	786	8743	6936.51	99.50	99.50	53.30	100.00	51.60
1993	786	7702	5962.21	87.90	88.00	55.10	86.60	53.40
1994	786	8349	6590.90	95.30	95.30	57.10	95.70	55.50
1995	786	7926	6387.99	90.50	90.50	58.60	92.80	57.20
1996	786	8784	7100.26	100.00	100.00	60.50	102.80	59.30
1997	786	7633	5918.77	87.10	87.30	61.60	86.00	60.40
1998	786	8760	7059.20	100.00	100.00	63.20	102.50	62.20
1999	786	7827	6328.41	89.40	89.40	64.20	91.90	63.30
2000	786	8784	7144.93	100.00	100.00	65.60	103.50	64.80
2001	786	7034	5416.66	80.30	80.30	66.10	78.70	65.40
2002	802	8760	7313.52	100.00	100.00	67.40	104.60	66.80
2003	802	7602	6205.07	86.80	86.70	68.00	88.30	67.50
2004	802	8784	7273.32	100.00	100.00	69.10	103.20	68.70
2005	786	8145	6755.40	93.00	93.00	69.90	98.10	69.60
2006	786	8647	7227.03	98.70	98.70	70.80	105.00	70.70
2007	786	8034	6645.29	91.70	91.70	71.40	96.50	71.50
2008	786	8784	7365.10	100.00	100.00	72.20	106.70	72.50
2009	786	7152	5891.61	81.60	81.70	72.50	85.60	72.90
2010	805	8084	6633.75	92.30	92.50	73.00	94.10	73.50
2011	805	7975	6518.83	91.00	91.00	73.50	92.40	74.00
2012	819	8432	7038.26	96.00	96.00	74.10	97.80	74.70
2013	819	8064	6679.22	92.00	92.00	74.60	93.10	75.20
2014	819	8760	7308.91	100.00	100.00	75.30	101.90	75.80
2015	819	8028	6598.04	91.60	91.60	75.70	92.00	76.20
2016	819	8510	7082.65	96.90	96.90	76.20	98.40	76.80
2017	819	8239	6861.50	94.00	94.00	76.60	95.60	77.20
2018	819	8760	7335.82	100.00	100.00	77.20	102.20	77.80
2019	819	6299	5214.02	99.80	99.80	77.50	100.90	78.20