Benefits of Converting Utility Gas Turbines to Combined-Cycle Plants PUBLIC ACCESS

[+] Author Affiliations
E. S. Miliaras

Energotechnology Corp., Cambridge, MA

P. Wilkinson

American Gas Association, Washington, DC

Paper No. 86-JPGC-GT-1, pp. V001T01A001; 7 pages
  • 1986 Joint Power Generation Conference: GT Papers
  • 1986 Joint Power Generation Conference: GT Papers
  • Portland, Oregon, USA, October 19–23, 1986
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7933-7
  • Copyright © 1986 by ASME


A large number of simple cycle gas turbines (about 8% of the total current electric generating capacity) had been installed by utilities by the late 1970s. Because of the low efficiency of these, older simple cycle gas turbines (about 25% at full load, much worse at part load) and the reduced demand for electricity, little use is now made of these machines by most utilities.

The paper considers the specific and broader benefits of converting these older gas turbines to combined-cycle plants. The benefits include dramatic efficiency improvement at all loads, improved operating reliability, low cost additions to utility generating capacity, and the potential availability of significant new capacity in many regions of the country in a short time.

The combined cycles can also be operated instead of oil-fired and coal-fired cycling steam plants — at significantly lower startup-up costs in fuel and operating personnel, and with considerable reduction in the wear and tear of the steam plants from cycling thermal stresses.

When additional, new peaking capacity is needed, these older, converted gas turbines can be replaced with new, more efficient machines.

Copyright © 1986 by ASME
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