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Personal Energy Report
A personalized report from Ameren Missouri to help you lower your energy use by comparing up to two years of your electric usage, annual electric charges and the average daily cost of your electricity. To see your usage monthly, sign into your online account. If you don't have an online account, it is easy to create one by registering with a UserID and Password. (more)  Log in or sign up now!

PEV
A plug-in electric vehicle (PEV) has a battery which charges by plugging into an electrical outlet to store electricity, providing power to an efficient electric engine. (more)

Phantom power
Also known as vampire power, many electronic devices use electricity whenever they are plugged into the outlet, even when they are off!  Most devices use very little energy at one time, but when you add up 24 hours a day, 365 days a year, unplugging the devices when not in use can equal energy savings. (more)

PHEV
A plug-in hybrid electric vehicle (PHEV) has a battery which charges by plugging into an electrical outlet to store electricity, providing power to an efficient electric engine to move the wheels. There are two basic types of plug-in electric vehicles: plug-in hybrid electric vehicle (PHEV) and all-battery electric vehicle (BEV). (more)

Photo frames (digital)
Digital photo frames display photos in a slideshow format, usually with an adjustable time interval. Digital photo frames also offer an impressive opportunity for energy savings. (more)

Photovoltaic
A device that converts sunlight into electricity.

Photovoltaic (or PV) solar panels
Photovoltaic (PV) is a method of converting sunlight into power. Photovoltaic power generation employs solar panels comprising a number of cells containing a photovoltaic material. (more)

Picture frame display (digital)
Digital photo frames display photos in a slideshow format, usually with an adjustable time interval. Digital photo frames also offer an impressive opportunity for energy savings. (more)

Plasma TV
Plasma TVs create a picture from a gas (plasma) filled with xenon and neon atoms and millions of electrically charged atoms and electrons that collide when you turn the power on. The energy the collision releases increases the energy level in the plasma and the neon and xenon release photons of light (similar to the way neon lights work). Plasma TVs offer large viewing areas (up to 50 inches) but are very thin. While they offer excellent picture quality, they are quite expensive and are fast becoming the popular choice for HDTV. (more)

Plug-in electric cars
A plug-in electric vehicle (PEV) has a battery which charges by plugging into an electrical outlet to store electricity, providing power to an efficient electric engine to move the wheels. There are two basic types of plug-in electric vehicles: plug-in hybrid electric vehicle (PHEV) and all-battery electric vehicle (BEV). (more)

Pool pump
A swimming pool pump is one of the largest energy users in the home. You can reduce a pool pump's energy usage by replacing the pump with a smaller or more efficient model or setting your existing pump to run less frequently. (more)

Poly Insulation
Insulation is added to buildings for comfort and saving energy. Glass-free polyester insulation is made from recycled plastic bottles and other post-consumer materials. (more)

Polyurethane spray foam insulation
Spray polyurethane foam (SPF), also known as open cell and closed cell foam, is better than any other type of insulation at reducing air leakage. Foamed-in-place insulation is relatively easy to use but it may be a more expensive way to completely fill walls and ceiling cavities. SPF insulation is ideal for smaller areas, however it can be used to completely insulate a home or building and is better than any other type of insulation to reduce air infiltration. Make sure you understand the pros and cons of using SPF before making your insulation choice. (more)

Portable generator
A portable generator is a gasoline, or diesel-powered device which provides temporary electrical power in the event of an emergency. The engine turns a small generator, which in turn creates usable electricity up to a certain level of wattage. (more)

Power factor correction device
A Power factor correction device - also called “black box" - is installed in a home's electrical system to help control power factor and reduce kVAR-hour usage. If Ameren Missouri is your electric supplier, Ameren Missouri bills by kilowatt-hour, not kVAR-hour usage. Therefore, these devices do not help Ameren Missouri customers reduce their energy bill. However, if your utility company bills you by kVAR-hour usage, these devices could possibly save you money on your electric bill. (more)

Power plant
A facility where electricity is generated and sent out through wires to the transmission grid which is made up of wires allowing the flow of electricity to be sent to business and residential customers for use.

Power strip/smart strip
A device with a strip of electrical outlets, usually four to six, that plugs into the wall outlet allowing several electric devices to be plugged into the same device. Power strips or smart strips are beneficial in saving energy because many electronic devices have a standby power mode to be instant-on when you turn it on. Instant-on electronics cost you energy and money as they sit waiting for you to turn them on. Power strips and smarts strips are commonly used with a computer system or a TV audio/video system. (more)

Power vent fan - attic
Ventilate comes from the Latin word for "to fan." Simply put, it's the action of moving air. Out with the hot. In with the cool. And that's exactly how ventilation works. It provides conditions that allow air to flow. Every time stale, overheated air in your home or attic is vented out and fresh air is pulled in to replace it, you have what is known as an "air exchange." It's a process that provides a steady, high volume of air movement. Think about it as a system of components, all sized and positioned to provide constant intake and exhaust of air. (more)

Programmable thermostat
A programmable thermostat is a thermostat which is designed to adjust the temperature according to a series of programmed settings that take effect at different times of the day. Programmable thermostats may also be called setback thermostats. (more)

Premium motor
NEMA Premium® labeled electric motors can optimize motor systems efficiency by reducing electric power consumption and costs and improving system reliability. It is estimated that the NEMA Premium® efficiency motor program would save 5,800 gigawatts of electricity. (more)

Pump, swimming pool
A swimming pool pump is one of the largest energy users in the home. You can reduce a pool pump's energy usage by replacing the pump with a smaller or more efficient model or setting your existing pump to run less frequently. (more)

Pure Power
Ameren Missouri’s voluntary renewable energy program. By signing up for Pure Power, customers support the development of wind power and other forms of renewable energy in Missouri and the Midwest through the purchase of certified renewable energy certificates (RECs). (more)


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R-Rating
R-rating or value indicates insulation’s resistance to heat flow. The higher the R-value, the greater the insulating effectiveness. (more)

R CFLs
A reflector CFL, or “R” series lamp, are used for recessed can lights, track lighting, dimming applications and in outdoor fixtures. CFL reflectors are available in a variety of sizes, finishes and wattages (more)

Radiant energy
Any form of energy radiating from a source, such as heat from the sun or a campfire, or light from a bulb. (more)

Rafter vent, attic
Rafter vents, also called insulation baffles, are used in attics when insulating. The baffles or vents fit inside the attic out next to the eaves or overhang so the soffit vents can allow air to enter the attic. The baffles keep insulation from falling onto the soffit vents, allowing outside cooler air to flow through the soffit vents creating an air flow to move hot air out of the attic through roof vents. (more)

RECs
A system was created that separates renewable electricity generation into two parts: the electricity  produced by a renewable generator and the renewable “attributes” of that generation. (These attributes include greenhouse gas avoided by generating electricity from renewable resources instead of conventional fuels, such as coal, nuclear, oil, or gas.) These renewable attributes are sold separately as renewable energy certificates (RECs). One REC is issued for each megawatt-hour (MWh) unit of renewable electricity produced. Purchasers of RECs are buying the renewable attributes of those specific units of renewable energy. This helps facilitate the sale of renewable electricity nationally. (more)

Recycle LED bulbs
According to ENERGY STAR®, LED bulbs or light emitting diode do not need to be recycled in the same manner as computers, electronics or CFLs since they do not contain mercury. The LED bulbs can be disposed of like traditional incandescent bulbs; however, many LED bulb components can be recycled. (more)

Recycle - Recycling appliances
Consider recycling appliances that are at the end of their life cycle or when it costs more to operate then than replace them  It is recommended that older, large appliances (especially refrigerators and freezers) be taken out of service and recycled before there is an actual mechanical failure. (more)

Refining facility
A facility that takes a crude substance (such as oil) and turns it into products such as electricity, fuels, or gases.

Refrigeration - Residential savings tips
According to the Department of Energy (DOE), the average residential home refrigeration costs may be as much as 4% of your energy bill. Refrigerator and freezer temperatures, age of your appliances, whether your appliances are ENERGY STAR® certified or not as well as your habits can play a role in unnecessarily using energy and costing you money.  For ways to save, see our residential savings tips. (more)

Refrigerator
A device used to keep food cold. A new refrigerator with an ENERGY STAR® label uses at least 20% less energy than required by current federal standards and 40% less energy than the conventional models sold in 2001. (more)

Refrigerator, multi-drawer
Refrigerators with a double freezer or a double cooling area allow you to organize food which help you find items quicker, saving you time and energy. Learn more about Residential or Business multi-drawer refrigerators.

Refrigerator recycling
Consider recycling appliances that are at the end of their life cycle or when it costs more to operate then than replace them  It is recommended that older, large appliances (especially refrigerators and freezers) be taken out of service and recycled before there is an actual mechanical failure. (more)

Refrigerator thermometer
A refrigerator or freezer thermometer is a special thermometer used to measure the temperature inside your refrigerator or freezer. Settings too cold can waste energy. (more)

Renewable energy
Renewable energy comes from sources that are not used up when we consume them to produce electricity for our homes, schools and businesses. (more)

Renewable Energy Certificates
See RECs.

Renewable resources
Renewable resources is energy that naturally occurs and is inexhaustible such as biomass, solar, wind, and hydroelectric power which is not derived from fossil or nuclear fuel. These fuels can be easily made or “renewed. ” We can never use up renewable fuels. (more)

Renovation
The construction, expansion, upgrade, or remodeling to an existing building or space possibly qualifying for and energy efficiency incentive.

Reservoirs
Natural or artificial ponds or lakes used for the storage of water.

Residential Energy Audit
An energy audit is an energy conservation inspection or survey, combined with an analysis, of the electric and natural gas flows for a home, building, process or system. The audit is conducted to find ways to reduce the amount of energy input into the system without causing a negative effect. Audit recommendations on ways to use less energy may include, but not limited to, caulking, window weather stripping, window insulation, door weather stripping, ceiling or wall insulation, windows, low flow shower heads, faucet aerators, gas water heater wrap, switch and outlet insulation, and hot water system whether electric or gas. The purpose of the audit is to calculate energy savings from making improvements. (more)

RESNET
An organization formed in 1996 to set standards for quality in the energy efficiency assessment industry for residential home energy audits. (more)

Retro-commissioning
A systematic process for improving the energy efficiency and operation of a building.

Roof
A cool or white roof is a roofing system that can reflect the sun's rays, reducing the heat transfer to a building. Cool roofs offer both immediate and long-term savings in building energy costs. (more)

Roof, green
A green roof is a residential or commercial building with vegetation growing on part or all of the rooftop. Green roofs may also be known as living roofs and are designed to be environmentally and aesthetically pleasing. (more)

Room air conditioner
Room air conditioners, sometimes referred to as window air conditioners, cool rooms rather than the entire home or business. (more)
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