Expanding the definition of "emergency" to include planned outages would increase the number of hours and days that data centers could run their Tier II generators. I'm already concerned about air quality in Northern Virginia communities, which will only get worse under the proposed revision. DEQ should be doing everything possible to move data centers away from Tier II generators entirely. While a substation outage can be a serious problem for customers, all data centers should be expected to have at least 4 hours of energy storage onsite. For outages that last longer, Tier IV generators are a viable, lower-polluting option, and should be what DEQ requires.