TransCanada offers to repower part of Ravenswood power plant

TransCanada Corp. has offered to the New York Power Authority two options to partially repower the aging, largely gas-fired Ravenswood power plant in Queens.

TransCanada was among a number of companies making offers to the authority under a state Energy Highway initiative, designed to identify new power generation and transmission projects for the future.

The two options being proposed by TransCanada for Ravenswood are:

  • Option 1 – the retirement of 265 MW of gas turbine capacity and the installation of new capacity totaling 265 MW using modern, efficient and proven low emissions technology.
  • Option 2 – the retirement of 377 MW of gas turbine capacity and the installation of new power generation totaling 426 MW using modern, efficient and low emissions technology. The repowered part of the facility would be comprised of 265 MW in a simple cycle cogeneration configuration capable of delivering up to 750 kpph of steam and 159 MW of peaking gas turbines. Also, the ‘A-House’ would be retired and redundant steam production facilities or fresh air firing capability on the proposed heat recovery steam generators will be provided to maintain a reliable supply to local utility Con Edison during periods of time when the new power generation equipment is not operational.

“TransCanada is proposing two re-powering options that provide a unique opportunity to take advantage of Ravenswood’s critical position in the New York electrical system,” said the proposal filed with the authority. “Situated in the heart of Zone J, a modernized Ravenswood would enhance long term system reliability, flexibility and environmental performance. Re-powering at the Ravenswood site would also eliminate new land disturbance and minimize transmission losses from out of zone generation. Modernizing this essential piece of New York’s energy infrastructure would provide long term reliability, efficiency and economic benefits to New Yorkers.”

Ravenswood site is located in Long Island City, Queens, along the East River in the New York ISO Zone J. The site has two electrical connections to Con Edison’s system – one through the 138 kV Vernon substation and a second through the 345 kV Rainey substation. The facility is fueled primarily by natural gas supplied from Con Edison’s natural gas distribution system. Peak gas supply to the site is 23,000 decatherms/h which is sourced from a Con Edison main that connects Manhattan and Queens. The site has dual fuel capability consisting of No. 6 oil firing capability for the conventional steam units and kerosene for some of the simple cycle units and the combined cycle gas turbine unit.

The facility currently has these facilities (MW values approximate):

  • Unit 10 – 380 MW
  • Unit 20 – 380 MW
  • Unit 30 – 990 MW
  • Unit 40 – 250 MW
  • Peaking Gas Turbines – 400 MW

In addition to power generation facilities, Con Edison owns and operates a steam generating facility on the Ravenswood site to supply retail customers. The steam facility, known as the ‘A-House’, uses No. 6 oil and a limited amount of natural gas with a peak steam generating capacity of approximately 750 kpph. Average annual steam volume delivered from the facility is approximately 900,000 klbs. “Subject to reaching a commercial agreement based on further discussion with Con Edison, the potential rejuvenation of steam generating capacity at the Ravenswood site creates a unique opportunity to improve the environmental footprint for the Ravenswood site as a whole,” said the TransCanada proposal.

TransCanada is a North American energy infrastructure company with 4,300 employees and operations in 34 states in the U.S. and seven provinces in Canada. The company has three main business lines: power generation, natural gas transmission and oil transmission. It purchased Ravenswood in 2009 from Keyspan/National Grid.

About Barry Cassell 20414 Articles
Barry Cassell is Chief Analyst for GenerationHub covering coal and emission controls issues, projects and policy. He has covered the coal and power generation industry for more than 24 years, beginning in November 2011 at GenerationHub and prior to that as editor of SNL Energy’s Coal Report. He was formerly with Coal Outlook for 15 years as the publication’s editor and contributing writer, and prior to that he was editor of Coal & Synfuels Technology and associate editor of The Energy Report. He has a bachelor’s degree from Central Michigan University.