Backup Power Guide for Colorado: 2026 Edition
Colorado's power challenges are unique due to its geography. While Xcel Energy maintains a robust grid in the Front Range, heavy spring snows and "bomb cyclones" regularly snap lines. For those living in the Rockies, foothills, or Eastern Plains, being self-reliant for 24-72 hours is standard procedure. The most critical factor for Colorado generators is altitude derating.
The Altitude Power Thief
Internal combustion engines need oxygen to run. At 5,000 feet, the air is ~17% less dense than at sea level. This means a 10,000-watt generator sold at Home Depot in Denver will only produce about 8,200 watts of actual power. If you live in Breckenridge or Leadville (9,000+ ft), you lose over 30% of rated power. Always buy a generator 20-30% larger than you think you need to account for this loss.
Heating During Outages
Most Colorado homes heat with natural gas, but the furnace needs electricity to blow that warm air. A small portable generator (2000W) is often enough to run the furnace fan, keeping your pipes safe. However, getting the power into the furnace requires a transfer switch or a pre-installed furnace plug. Extension cords cannot power a hardwired furnace.
🏔️ Pro Tip for Colorado
If you buy a portable generator, ensure it comes with a "High Altitude Kit" (a smaller carburetor jet). Without it, the engine will run "rich" (too much fuel, not enough air), causing it to sputter, foul spark plugs, and lose even more power.