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Per Drewes

Professional Profile:

Per Drewes is a scientist and principal engineer of Sol Source Partners, a consulting company specializing in photovoltaics. Prior, Per Drewes was a Senior Research Engineer at Ontario Hydro and worked in the utility business, specifically in the renewable energy sector, for more than twenty five years. Specializing in solar and wind energy, he was project engineer for most of Ontario Hydro's pioneering work in this technology. He conceived, designed and installed all the utility's photovoltaic projects including Canada's first large remote photovoltaic supply, Canada's first grid connected residential photovoltaic power supply, Canada's first diesel hybrid system and Canada's largest photovoltaic installation, an 80 kW system supplying power for a hospital in Toronto. He has also designed and built small power supplies for remote applications in Northern Ontario as well as Africa.

Per Drewes was responsible for writing Section 50 of the Canadian Electrical Code relating to photovoltaics and has been an advisor to the federal government. He has written numerous papers on solar energy, both for technical journals and the popular press (Canadian Geographic). He has given many presentations to professional groups, on television and has taught a course on photovoltaic technology at the University of Toronto.

Per Drewes represented Canada on the International Energy Agency Task 7 Committee “Photovoltaics in the Built Environment”. In addition to providing guidance on electrical issues for the Committee, he designed and installed Canada’s case studies and was the author of Chapter 6 of “Designing with Solar Power”, a source book for building integrated photovoltaics produced by some members of Task 7. Other well known projects include CMHC sponsored Healthy House in downtown Toronto, Noel Harding’s Elevated Wetlands sculptures in the Don Valley and the Living Machine building at Kortright.

Per Drewes received the Ontario Hydro President’s Sustainable Energy Development Champion Award in 1997 (Photovoltaics at Point Pelee Park) and 1999 (Solar on King City H.S.) and was named Engineer of the Year (1999) in York Region by the Professional Engineers of Ontario.

Since forming Sol Source Power, he has worked as Technical Advisor for ATS Automation Tooling Systems Inc. in the area of research and product development focusing on the unique characteristics of Spheral Solar ™ technology. He also teaches do-it-yourself courses at the Kortright Centre for Conservation to people wishing to install photovoltaic systems or small wind turbines at their remote home or cottage.

Present work includes an evaluation of bus shelter sites in Toronto for photovoltaic powered advertising displays for a large media company, design of a building integrated photovoltaic system for a new University of Toronto building, and the design and installation of two large photovoltaic systems at Sunnybrook Health Care Centre in Toronto. Per Drewes is also acting as advisor to municipal governments and private corporations wishing to develop large solar projects under the OPA Standard Offer Program.


B.Sc. (Physics) University of Waterloo 1970, M.A.Sc. (Aerospace) University of Toronto 1972, P.Eng. (Mech. Eng.) 1981

Ontario Hydro Solar Energy Projects - originated, designed, and installed

  • Atikokan remote power supply (2.5 kW) 1981
  • Kortright grid connected residential system (I kW) 1983
  • Kortright experimental arrays (3 kW) 1985
  • Big Trout Lake PV   diesel (10 kW) 1985
  • Small PV water pump systems 1988
  • Kortright cottage PV systems 1988
  • Long Dog residential systems (10 X 180 W) 1989
  • Deep well PV pump testing 1993
  • Healthy House (2X2.7 kW) 1995
  • Hugh MacMillan PV/utility systems (3 X 25 kW) 1992 1995
  • Hugh MacMillan PV canopy (5 kW) 1995
  • Kortright PV shingle building (1 kW) 1998
  • Kortright Living Machine (4 kW) 1999
  • Honduran Storm Relief Solar Power Supply (1 kW) 1999

Ontario Hydro Wind Energy Projects - project engineer

  • Sudbury wind/diesel tests 1981 1984
  • Fort Severn 60 kW remote community system 1985 1988
  • Small battery charging systems 1988
  • Kortright 10 kW utility interactive demonstration 1990

Sol Source Energy Projects

  • Mississauga Straw Bale House (2.2 kW) 2000
  • Automation Tooling Systems Inc. roof top (5 kW) 2001
  • Ontario Power Generation Inc. roof top (5 kW) 2001
  • CN Tower (1 kW) 2002
  • Canada Wildlife Remote Staff House (1.2 kW) 2002
  • Canada Centre for Housing Technology (3 x 1.6 kW) 2003
  • University of Toronto Mississauga Campus (5.4 kW) 2004
  • PV/Skylight Waterloo City Hall (1.5 kW) 2005
  • Roof Integrated Residential PV in Texas (1.8 kW) 2006
  • Roof Integrated PV System on EMS Garage in Cambridge (10 kW) 2006
  • Interconnection of new Bloorview PV system under OPA Standard Offer Program (38 kW) 2008
  • Numerous residential, small cottage and remote power supplies
  • Installation of two large photovoltaic systems at Sunnybrook Health Care Centre in Toronto 2009

Sol Source Power Photovoltaic Studies (recent):

  • Potential for solar technology at the Canadian Forces Base at Meaford 2006
  • Evaluation of 40 potential pv sites for the City of Toronto 2006
  • Evaluation of organic photovoltaic technology on behalf of investment firm 2007
  • Feasibility study for photovoltaic systems for new Ajax municipal building 2008
  • Study of concentrator photovoltaic technology for Toronto property management company 2008
  • Monitoring performance of solar lit bus shelters 2009