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Avatar for Mr. Electric of Golden CO
Mr. Electric of Golden CO
5.0(
17
)
Portable Generator - Install

Serving Derby, CO and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"Mr Electric of Golden put together an amazing team to solve a challenging problem at my mountain home. I wouldnâ t hesitate to hire them again. Many thanks to Clay, Liz, Randy, Brandt and Chris"
Electrical Safety
Repairs
Installations
Another Quality Job Completed
Wall where the customer requested the charger

+25

Response time2 hrs
Response rate99%
7 neighbors recently requested a quote
Avatar for Productive Electric, LLC
Productive Electric, LLC
4.9(
14
)
Generator - Install - For Business

Serving Derby, CO and surrounding areas

Approved

In business since 1992

Free estimates

Credit card accepted

"Tom was great at installing my RV outlet. Out of the 3 different quotes I received, he was able to get it done without trying to talk me into more expensive options. He was also accommodating with my somewhat busy schedule and very responsive throughout the install planning process. I would highly recommend Productive Electric."
Response time1 day
12 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for True Bloom Energy Solutions LLC
True Bloom Energy Solutions LLC
5.0(
6
)
Fixed Generator - Install

Serving Derby, CO and surrounding areas

Approved

Credit card accepted

We take great pride in our experience, expertise, quality, and customer service that we provide to meet the consumer's needs. It is our mission to provide excellent workmanship and complete customer satisfaction from start to completion of a project. In order to understand the needs and expectations of our customers, we take great care to work and communicate with every customer in a professional manner. Our reputation is based on service, safety, and quality, regardless of how large or small the job.

13 neighbors recently requested a quote
Avatar for Rapid Energy Solutions, LLC
Rapid Energy Solutions, LLC
4.7(
12
)
Fixed Generator - InstallFixed Generator - RepairGenerator - Install - For Business+3 more

Serving Derby, CO and surrounding areas

Approved

In business since 2016

Free estimates

Credit card accepted

"Woman who called me to give me more info and schedule was excellent and very friendly, great communication with her. The owner, I believe, who came to look at the job and give me a bid was professional and efficient as were the 3 guys who did the work. There was a 2 hour minimum work window which meant a $200 starting base price. They were done with my two projects (installing the outlet and fixing a hallway light) in less than an hour, so I guess I should have had more projects to get my full money's worth. They did a great job, though."
4 neighbors recently requested a quote
Recommended by90%of homeowners
Avatar for Blue Sky Plumbing & Heating Inc.
Blue Sky Plumbing & Heating Inc.
5.0(
6
)
Fixed Generator - Install

Serving Derby, CO and surrounding areas

Approved

In business since 1989

Free estimates

Small jobs welcome

Blue Sky Plumbing, Heating, Cooling & Electric is a fourth-generation, family-owned home service company proudly serving the Denver Metro area since 1916. For over 100 years, our team has delivered trusted plumbing, HVAC, sewer, drain, electrical, and indoor air quality solutions with a commitment to honest service and long-term customer relationships.\n\nAs a locally owned company, we combine modern expertise with generations of hands-on experience to provide reliable repairs, installations, maintenance, and emergency services for homeowners across Colorado. Customers choose Blue Sky for our highly trained technicians, transparent communication, same-day availability, and dedication to doing the job right the first time.\n\nFrom routine plumbing repairs to complete heating, cooling, and electrical upgrades, Blue Sky is committed to delivering comfort, safety, and peace of mind to every home we serve.

Photos
60 neighbors recently requested a quote
Redrocks Roof and Solar LLC
4.1(
9
)
Fixed Generator - InstallGenerator - Install - For Business

Serving Derby, CO and surrounding areas

Approved

In business since 2022

Free estimates

Warranties offered

"Really responsive and prompt, especially in the installation phase. We did have a couple of small hiccups, which in my mind a homeowner should expected on literally any remodeling project, and they were resolved quickly. Communication on final details like inspections could have been smoother, but overall the whole process was very clear, well managed, and well executed. Happy with the choice to go with Red Rocks."
Response time1 day
Response rate89%
Recommended by75%of homeowners
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Generator Install questions, answered by experts

A 1,500 square foot home will likely need a 15kW to 20kW generator. When deciding on whole-house generator size, add up the total wattage of the devices that you’d like to continue running during a power outage. That way, you can ensure you purchase a generator that can power your necessary appliances or medical equipment during an electrical emergency.

Carbon monoxide emissions aren’t only dangerous to human life, but they also harm our planet. While natural gas generators emit lower levels of CO than other fuel sources, there are still ways to reduce emission levels. For example, shop around for an eco-friendly generator that complies with current emission standards. Also, make sure your generator is serviced regularly to avoid CO buildup. 

As a safety measure, you should always turn off the main breaker while operating your generator’s backup breaker. In addition, you should also switch off all appliance breakers so you don't have a power surge when the main breaker turns back on. And finally, turning off the main breaker prevents back-feeding, which endangers utility workers with the risk of electrocution. Back-feeding could also destroy the electrical circuits of your neighbors if they use the same power network.

To determine the right size generator for your house, you should calculate the total wattage of the appliances and devices you want to power during an outage. List all essential items, note their start-up wattages, and add them together.

Here are some typical wattage requirements for common appliances:

  • Refrigerator: 600 watts

  • Large dehumidifier: 700 watts

  • Large window air conditioner: 1,400 watts

  • Water heater: 3,000 to 4,500 watts

  • Electric furnace: 5,000 to 25,000 watts

A 7,500-watt generator might be sufficient for essentials like a refrigerator, freezer, well pump, and lighting circuits. However, for high-demand items like a water heater or furnace, a whole-home generator is a better choice. A portable generator may be enough if you only need to power a few critical items.

While home square footage can offer a rough estimate, it is not always a reliable indicator. For reference, here are some typical generator sizes based on square footage:

  • 1,000 sq ft: 6–9 kW

  • 1,500 sq ft: 7–10 kW

  • 2,000 sq ft: 10–14 kW

  • 2,500 sq ft: 12–16 kW

  • 3,000 sq ft: 16–20 kW+

For the most accurate sizing, consult a professional who can calculate your home's peak and average power consumption and recommend the optimal generator.

To reduce AC startup power for a whole-house generator, install a soft start kit or hard start capacitor, which lowers the initial surge by gradually ramping up the compressor. Using a smart load manager can also help by staggering startup loads, preventing a system overload and future costly repairs.

The Derby, CO homeowners’ guide to generator installs

From average costs to expert advice, get all the answers you need to get your job done.