Ask an Expert


Have you ever wondered whether cars could run on cow manure? Or what kind of a difference it makes to use compact fluorescent bulbs? Now you can get answers to these and all your energy-related questions. Just Ask an Expert!

The Expert answers new questions regularly, so check back to see if YOUR
question is up!

Click here to ask a new question

Click on a question below to see the answer:

NEW! What kind of a difference does it really make to replace a regular light bulb with an energy-saving one?


  • LEDs use 75% less energy than standard incandescent light bulbs.
  • LEDs can save over $80 in energy costs over the lifetime of the bulb.
  • LEDs last up to 25 times longer than standard incandescent light bulbs.
  • On average, lighting accounts for 12% of a home's electricity use.

NEW! How much is the average heating and cooling bill for the state of Iowa? What is the average natural gas bill for the state of Iowa?

Answer: There are far too many variations in home size and heating and cooling patterns to provide a meaningful average heating and cooling bill or natural gas bill for the state of Iowa. But I can tell you that the average family in Iowa can spend over half of its annual household energy bills on heating and cooling! You can learn how to save energy on heating, cooling, water heating, lighting, and other home energy uses on this website. Start by playing the Stop the Guzzler game and doing the Home Energy Inspection with your family.

The appliances that use the most electricity are an electric space heater, electric air conditioner, electric water heater, electric clothes dryer, and possibly also your refrigerator.

Does leaving the lights on really use a lot of electricity? What appliance uses the most?

Answer: Compared to the bigger energy guzzlers like heating and cooling, water heating, and clothes drying, leaving lights on doesn’t technically use a lot of energy. Lighting represents only about 10% of home energy use. However, in the bigger picture, leaving lights on when they are not being used does waste electricity, and it’s important to try to save electricity in every way we can. So turning out lights is still a good habit to get into. And if you swap out your regular incandescent light bulbs with CFLs (compact fluorescent lights) or LEDs (light-emitting diodes), both of which use far less energy and last a lot longer than regular light bulbs, you will notice obvious savings in energy and cost. Replacing five incandescent bulbs with ENERGY STAR qualified light bulbs will save more than $150 in electricity costs over their lifetime. And, an LED bulb can last 25 times longer than a standard incandescent bulb.

The appliances that use the most electricity are an electric space heater, electric air conditioner, electric water heater, electric clothes dryer, and possibly also your refrigerator.

What are the five steps of basic transmission and distribution?

Answer: Visit our website to view virtual plant tours and see the phases of energy production from start to finish.

What organization in the world uses the most energy?

Answer: There is no worldwide, publicly available data on energy usage that would include all organizations. But according to the International Energy Association, among the four sectors of residential, commercial, industrial, and transportation, the industrial sector uses the greatest amount of energy, by a significant amount. The industrial sector consists of all facilities and equipment used for producing, processing, or assembling goods.

Does it use energy to leave a charger plugged into an outlet without a charging device connected to it?

Answer: Chargers are known as “energy vampires,” because they draw a lot of energy by being plugged in when items like cellphones or iPods are already charged or not even connected to them. In fact, only 5 percent of the power drawn by a cellphone charger is used to charge the device. The other 95 percent is wasted when it is left plugged into the wall! To stop this energy waste, get yourself (and your family) in the habit of unplugging all chargers when not in use.

What are the cons of fossil fuels?

Answer: Fossil fuels (coal, oil, and natural gas) are considered nonrenewable energy sources. This means that once they are all used up, they are gone forever. This is one of the cons of fossil fuels, as during this century these fuel sources are becoming less plentiful. Another con is that burning fossil fuels contributes carbon dioxide to the atmosphere, which many scientists believe is a major contributor to climate change.

What is energy?

Answer: Energy is the ability to do work. Humans eat food for the energy we need to grow, move, and perform our work. Plants use the energy of the sun to grow and bear fruits, flowers, and vegetables. Machines use energy derived from fossil fuels and renewable resources (like sun, wind, moving water, and biomass) to perform the various functions they are designed to do. So in all cases, energy allows things, both living and nonliving, to do work.

What is a way people can save nuclear energy?

Answer: Nuclear energy is used to generate electricity, so people can save nuclear energy the same way they save other forms of energy: by developing habits that use less electricity at home or school, or by using electrical devices that are energy-efficient. For specific ideas on how you can save electricity at home, check out the Home Energy Inspection on this site.

What are some ways heat is lost in the house?

Answer: There are many ways that heat can be lost in a house, such as through improperly sealed windows and doors; poorly insulated attics and basements; and gaps around baseboards or flooring edges, plumbing vents, electrical wall outlets, and switches. If you’re interested in learning how to better seal and insulate your home so that heating and cooling energy isn’t wasted, check out this link at ENERGY STAR®:

Why isn’t solar or wind energy available to be part of the “grid”?

Answer: Wind energy is very much a part of MidAmerican Energy Company’s offerings on the “grid,” making up approximately 30% of our generating capacity. MidAmerican Energy has been installing wind turbines since 2004, and is number one in the nation in wind-powered capacity among rate-regulated utilities. Iowa has a greater wind resource than solar resource, so the focus in Iowa has been on wind energy. MidAmerican Energy currently has 1,267 wind turbines, all in Iowa. Sister companies in other states have greater solar resources and utilize solar energy on the grid as part of their balanced energy portfolio.

Some small businesses or homeowners choose to install solar panels or wind turbines that are “off-grid” and connected to batteries. The majority of renewable energy systems are connected to the grid.