**6.1 Hourly GHG emission factors**

The results for the NGHGIFA for the years 2004, 2005, and 2006 are shown in Table 2 (Gordon & Fung, 2009).


Table 2. Hourly annual and seasonal average GHG emission factors

Table 2 shows a large variance between emission factors throughout the year and from year to year. Clearly, the use of hourly data is necessary to accurately estimate the GHG reduction potential from renewable technologies.
