FAQs

Q?

Why are there occasions of brief periods of yellow plume form our stacks?

A.

The occurrence of the brief periods of yellow plume occurs as the plant is going through a start-up cycle. These periods are normal for all natural gas-fired fuelled combined cycle generating facilities, and in fact Goreway, unlike most plants in Ontario, can manage their occurrence to brief periods because of its use of selective catalytic reduction (SCR) technology. Also, the daytime plant starts are more common during the winter months, particularly in the early and late winter when daytime electricity demand is not as high. However, once the plant achieves its normal minimum load, the only visible plume is from the water vapour in the exhaust that is formed from the combustion of the hydrogen that is in the natural gas fuel. As is the case for the exhaust from any natural gas fuelled appliance, for example, a residential furnace, in which the plume will be most noticeable on cold days with higher relative humidity, as it takes longer for the water vapour in the plume to disperse under those conditions.

Q?

Is the plant expected to run all the time?

A.

While the station is certainly capable of running around the clock, the plant is expected to operate primarily during periods when demand for electricity is high – normally this is from early morning into the evening. The plant will often shut down during night time hours and restart the following morning.

Q?

Will there be ongoing construction or outage activities?

A.

The plant achieved commercial operations in June 2009. Although all major construction was completed by then, outside contractors may be onsite for several weeks, year-to-year, in order to undertake preventative maintenance on the plant equipment.