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Glossary of Terms: R

Reactive Organic Gas: In the SCAQMD New Source Review program, ROG is any gaseous chemical compound which contains the element of carbon excluding a variety of compounds.

REC Banking: An administrative means by which RECs can be stored for later user or sale. For example, Texas RECs have a 3-year life. If a REC is not used in the year of its creation, it may be banked and used in either of the next 2 compliance periods (years). The issue date of the RECs coincides with the beginning of the compliance year in which the RECs were generated.

RECLAIM: The Regional Clean Air Incentives Market established by the SCAQMD, a cap and trade rule covering sources with 4 tons per year or more of NOx or SOx emissions and resulting in a reduction of NOx and SOx emissions of 75% and 61%, respectively, from affected sources.

RECLAIM Pollutants: In the RECLAIM program, oxides of nitrogen (NOx) and oxides of sulfur (SOx), excluding any NOx emissions from on-site, off-road mobile sources and any SOx emissions from equipment burning natural gas.

RECLAIM Trading Credit: In the RECLAIM program, the RTC is a limited authorization to emit a RECLAIM pollutant in accordance with the restrictions and requirements of the RECLAIM rules. Each RTC has a denomination of one pound of RECLAIM pollutant and a term of one year, andcan be held as part of a facility’s Allocation or alternatively may be evidenced by an RTC Certificate.

Reference Year: The benchmark year on which emission reduction targets are established. The Kyoto protocol uses 1990 as the reference year against which Annex I nations are required to control their emissions

Reforestation: A process that increases the capacity of the land to sequester carbon by replanting forest biomass in areas where forests were recently harvested.

Regional Greenhouse Gas Initiative (RGGI): a cooperative effort by Northeastern and Mid-Atlantic states of the United States of America to reduce carbon dioxide emissions establishing of a regional cap-and-trade program initially covering carbon dioxide emissions from power plants in the region.

Registration: the formal acceptance by the Executive Board of a validated project activity as a project activity. Registration is the prerequisite for the verification, certification and issuance of credits related to that project activity.

Registries, registry systems: Electronic databases that will track and record all transactions under the Kyoto Protocol's greenhouse-gas emissions trading system (the “carbon market”) and under mechanisms such as the Clean Development Mechanism.

Removal Units (RMUs): A Kyoto Protocol Unit equal to , representing sinks credits generated in Annex 1 countries, including through Joint Implementation. RMUs can only be used to meet emissions targets in the commitment period in which they were generated, and cannot be banked for future use.

Renewable Energy: Energy derived from natural resources (ie. Wind, solar, hydro, biofuels) which are naturally replenished.

Renewable Energy Guarentee of Origin (REGO): A guarantee of origin issued in respect of each kilowatt hour produced from renewable energy sources in the UK.

Renewable Energy Certificate or Credit (REC): generally synonymous with Green Tags and Transferable Renewable Energy Credits (TRECs). A REC is not electricity. It represents the renewable or “green” aspect of electric power generated through the use of renewable fuels, such as wind, hydro, solar, and biomass that produce one MWh or KWh of electricity from a certified renewable generator. Depending on the program under which they are generated, RECs can be bought and sold separate from the power from which they are derived. REC buyers include power generators and users that are required, or elect, to provide or use a certain percentage of green power. REC sellers include power generators and traders that hold more RECs than they require.

Renewable Portfolio Standard (RPS): Requirement for electricity retailers to purchase a specific % of sales from renewable energy generators.

Renewable Obligation: The Renewable Obligation requires generators in the UK to produce a fixed percentage per year of electricity from renewable fuel sources. Certificates are issued under the scheme to renewable generators which can be negotiated and traded to allow generators to hit their targets.

Renewable Obligation Certificates (ROCs): ROCs are certificates issued for eligible renewable electricity generated and supplied to customers in the UK by a licensed supplier, who are subject to the Renewable Obligation.

Renewable Transport Fuel Obligation (RTFO): A mandate in the UK that will require 5% of all road vehicle fuel to be supplied from sustainable renewable sources by 2010.

Revegetation: A direct human-induced activity to increase carbon stocks on sites through the establishment of vegetation that covers a minimum area of 0.05 hectares and does not meet the definitions of afforestation and reforestation.