Mark Mawhiney

Ontario Power Generation/First Line Manager, Inspection and Maintenance

2025 Salary

$208,331

Total compensation $216,522, including $8,192 in taxable benefits.

Source: Ontario’s Public Sector Salary Disclosure — names paid $100,000 or more that year. How we build this · Report an error on this page

At a Glance
2025

Employer Rank

#1,409

Ontario Power Generation

Years on List

2006–2025

Peak Salary

$233,698

2024

Full 2025 roster at Ontario Power Generation →·See where $208,331 ranks →

Total Compensation History

Total compensation, 2006–2025. Axis starts at $100,000, the Sunshine List disclosure threshold.

Full History
2006–2025

$110,232 in 2006 is worth about $165,904 in 2025 dollars.

Full salary history, by year
Year	Employer	Position	Salary	Benefits	Total
2025	Ontario Power Generation	First Line Manager, Inspection and MaintenanceOntario Power Generation	$208,331Benefits $8,192Total $216,522	$8,192	$216,522
2024	Ontario Power Generation	Field Shift Operating SupervisorOntario Power Generation	$233,698Benefits $6,840Total $240,538	$6,840	$240,538
2023	Ontario Power Generation	Field Shift Operating SupervisorOntario Power Generation	$230,943Benefits $7,335Total $238,278	$7,335	$238,278
2022	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$196,807Benefits $6,535Total $203,341	$6,535	$203,341
2021	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$194,980Benefits $5,890Total $200,870	$5,890	$200,870
2020	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$189,774Benefits $5,300Total $195,073	$5,300	$195,073
2019	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$186,819Benefits $4,611Total $191,429	$4,611	$191,429
2018	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$175,767Benefits $4,614Total $180,380	$4,614	$180,380
2017	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$175,398Benefits $5,097Total $180,495	$5,097	$180,495
2016	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$147,523Benefits $1,561Total $149,084	$1,561	$149,084
2015	Ontario Power Generation	Nuclear Waste Operator First Line Manager AssistantOntario Power Generation	$172,032Benefits $1,513Total $173,545	$1,513	$173,545
2014	Ontario Power Generation	Nuclear Waste OperatorOntario Power Generation	$141,752Benefits $1,469Total $143,221	$1,469	$143,221
2013	Ontario Power Generation	Nuclear Waste OperatorOntario Power Generation	$143,487Benefits $1,451Total $144,938	$1,451	$144,938
2012	Ontario Power Generation	Nuclear Waste OperatorOntario Power Generation	$153,638Benefits $1,430Total $155,068	$1,430	$155,068
2011	Ontario Power Generation	Nuclear Waste OperatorOntario Power Generation	$121,815Benefits $1,414Total $123,229	$1,414	$123,229
2010	Ontario Power Generation	Nuclear Waste OperatorOntario Power Generation	$149,071Benefits $6,175Total $155,245	$6,175	$155,245
2007	Ontario Power Generation	Fossil Operating TechnicianOntario Power Generation	$104,929Benefits $1,162Total $106,091	$1,162	$106,091
2006	Ontario Power Generation	Fossil Operating TechnicianOntario Power Generation	$110,232Benefits $1,532Total $111,764	$1,532	$111,764

Take-Home Pay
(After Tax) · 2025 estimate

In 2025, Mark Mawhiney's $208,331 salary works out to roughly $134,865 after income tax, CPP and EI — an all-in deduction rate of about 35.3%. At Ontario Power Generation, 10,346 people made the 2025 list with a median salary of $161,066; Mark Mawhiney's total compensation of $216,522 ranked #1,409. Members of OMERS, OTPP, HOOPP or OPTrust typically take home another 7–10% less after pension contributions, which this estimate leaves out.

Estimated net pay: ~$134,865
Effective income-tax rate (excl. CPP/EI): ~32.6%
CPP + EI contributions: ~$5,507
All-in deduction rate (incl. CPP/EI): ~35.3%
vs. 2025 First Line Manager Inspection Maintenance median: +5%

Where does $208,331 rank on the Sunshine List? →

Estimate only: 2025 federal and Ontario rates, basic personal amounts, Canada employment amount and CPP/EI credits; single, employment income only, salary treated as full-year income. Ignores pension contributions (OMERS, HOOPP, OTPP, OPTrust and similar plans lower actual take-home), union dues, RRSPs and benefits.

Also at Ontario Power Generation
2025

Also at Ontario Power Generation, 2025
#	Name	Position	Salary	Total
1	Kenneth Hartwick	Special Advisor	$1,907,409	$1,910,992
2	Nicolle Butcher	President and Chief Executive Officer	$1,596,218	$1,598,309
3	Steve Gregoris	Chief Nuclear Officer	$1,092,855	$1,096,651
4	Aida Cipolla	Chief Financial Officer and Chief Administrative Officer	$1,013,496	$1,016,119
5	Subo Sinnathamby	Chief Projects Officer	$981,476	$985,253
6	Mark Knutson	Chief Enterprise Engineering and Chief Nuclear Engineer	$856,947	$859,793
7	Jon Franke	Senior Vice President Nuclear	$826,655	$828,637
8	Shelley Babin	Chief Operations Officer	$748,469	$750,849
9	Brenda Macdonald	Chief Commercial Officer	$727,479	$729,740
10	David Kaposi	Executive Vice President Investment Strategy and Business Development	$701,432	$703,541