[aerohead]

I located this reference as well:
Photovoltaics Today and Tomorrow, by H.M. Hubbard, Director, Solar Energy Research Institute, Golden, Colorado, SCIENCE, VOL. 244, 21 April 1989.
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As of 1989, Coal and Solar PV were of equal cost, $ 0.30-kWh.
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References:
Solar Energy Research Institute
Bell Telephone Laboratories
National Science Foundation
US Department of Energy ( DOE ) National Photovoltaics Program, Stanford University.
Institute of Electrical and Electronic Engineers, Inc., New York.
University of New South Wales, Australia.
Atlantic Richfield Company ( ARCO )
ARCO Solar Inc.
Pacific Gas & Electric, Davis, California test site.
Chronar Corporation, San Diego, California.
SeaWest Power Systems, San Diego, California.
Hespiria Plains solar farm, ARCO Solar, Inc..
Sandia National Laboratory, Albuquerque, New Mexico.
US Patent Office.
Jet Propulsion Laboratory, CalTech, Pasadena, California.
Pacific Northwest Laboratory, Richland, Washington.
American Chemical Society.
Photovoltaic Energy Systems, Casanova, Virginia.
'Social Costs of Energy Consumption,' O. Hohmeyer, ( Springer-Verlag, N.Y., 1988 ).
K.W. Boras, personal communication.
Electric Power Research Institute, Palo Alto, California.
Federal Energy Regulatory Commission, Washington, D.C..
Florida Solar Energy Center, Cape Canaveral, Florida.
Argonne National Laboratory, Argonne, Illinois.
Secretariat of International PVSEC-2, Tokyo, Japan.