View source for Net metering

{{Short description|Type of billing of electricity generated from renewable sources}}
{{use dmy dates |date=September 2024}}
{{Duplicated citations|reason= https://web.archive.org/web/20130521074227/http://apps3.eere.energy.gov/greenpower/resources/pdfs/current_nm.pdf (refs: 5, 56) this is a result of transclusion<br>
https://www.academia.edu/35065588 (refs: 7, 59) This is also the result of transclusion|date=August 2024}}
{{Green economics sidebar}}
{{Sustainable energy}}

'''Net metering''' (or '''net energy metering''', '''NEM''') is an electricity billing mechanism that allows consumers who generate some or all of their own electricity to use that electricity anytime, instead of when it is generated. This is particularly important with [[renewable energy]] sources like [[Wind power|wind]] and [[Solar power|solar]], which are [[Variable renewable energy|non-dispatchable]] (when not coupled to storage). Monthly net metering allows consumers to use solar power generated during the day at night, or wind from a windy day later in the month. Annual net metering rolls over a net kilowatt-hour (kWh) credit to the following month, allowing solar power that was generated in July to be used in December, or wind power from March in August.

Net metering policies can vary significantly by country and by state or province: if net metering is available, if and how long banked credits can be retained, and how much the credits are worth (retail/wholesale). Most net metering laws involve monthly rollover of [[kilowatt hour|kWh]] credits, a small monthly connection fee,{{NoteTag|Electric bills contain a connection fee and an energy fee based on the number of kilowatt-hours used that month. When no kilowatt-hours are used the monthly connection fee is still paid. When the meter turns backward for the month, the negative kilowatt reading is rolled over to the next month.}} require a monthly payment of deficits (i.e. normal electric bill), and annual settlement of any residual credit. Net metering uses a single, bi-directional meter and can measure the current flowing in two directions.<ref>{{cite web |url=https://energyinformative.org/net-metering-feed-in-tariffs-difference |title=What's the Difference Between Net Metering and Feed-In Tariffs? |date=28 February 2023 }}</ref>
Net metering can be implemented solely as an accounting procedure, and requires no special metering, or even any prior arrangement or notification.<ref>{{cite web |url=http://www.cres-energy.org/blogs/blogs_newton_07apr.html |title=Net Metering is a Win-Win for Utilities and Local Communities |website=Cres-energy.org |access-date=2013-12-15 |url-status=dead |archive-url=https://web.archive.org/web/20131001171510/http://www.cres-energy.org/blogs/blogs_newton_07apr.html |archive-date=2013-10-01 }}</ref>

Net metering is an enabling policy designed to foster private investment in [[renewable energy]].

{{TOClimit|3}}

== History ==
Net metering originated in the United States, where [[small wind turbine]]s and solar panels were connected to the electrical grid, and consumers wanted to be able to use the electricity generated at a different time or date from when it was generated. The first two projects to use net metering were an apartment complex and a solar test house in Massachusetts in 1979.<ref>{{cite web|url=https://cleantechnica.com/2015/09/06/net-metering-history-logic-part-1/|title=Net Metering History & Logic -- Part 1|date=2015-09-06|website=CleanTechnica|language=en-US|access-date=2019-09-07}}</ref> Minnesota is commonly cited as passing the first net metering law, in 1983, and allowed anyone generating less than 40&nbsp;kW to either roll over any  credit to the next month, or be paid for the excess. In 2000 this was amended to compensation "at the average retail utility energy rate". This is the simplest and most general interpretation of net metering, and in addition allows small producers to sell electricity at the retail rate.<ref name=":0">{{cite web |url=http://www.dsireusa.org/solar/incentives/incentive.cfm?Incentive_Code=MN01R&re=1&ee=1 |title=Minnesota |publisher=Dsireusa.org |access-date=2013-12-15 |url-status=dead |archive-url=https://web.archive.org/web/20121019232315/http://www.dsireusa.org/solar/incentives/incentive.cfm?Incentive_Code=MN01R&re=1&ee=1 |archive-date=2012-10-19 }}</ref>

Utilities in Idaho adopted net metering in 1980, and in Arizona in 1981. Massachusetts adopted net metering in 1982. By 1998, 22 states or utilities therein had adopted net metering. Two California utilities initially adopted a monthly "net metering" charge, which included a "standby charge", until the Public Utilities Commission (PUC) banned such charges.<ref name=currentnm>{{cite web |url=http://apps3.eere.energy.gov/greenpower/resources/pdfs/current_nm.pdf |title=Current Experience With Net Metering Programs (1998) |access-date=2013-12-15 |url-status=dead |archive-url=https://web.archive.org/web/20130521074227/http://apps3.eere.energy.gov/greenpower/resources/pdfs/current_nm.pdf |archive-date=2013-05-21 }}</ref> In 2005, all U.S. utilities were required to consider adopting rules offering net metering "upon request" by the [[Energy Policy Act of 2005]]. Excess generation is not addressed. As of 2013, 43 U.S. states have adopted net metering, as well as utilities in 3 of the remaining states, leaving only 4 states without any established procedures for implementing net metering.<ref>{{cite web |url=http://www.dsireusa.org/documents/summarymaps/Net_Metering_map.pdf |title=Net Metering Map |access-date=2013-12-15 |url-status=dead |archive-url=https://web.archive.org/web/20140703061348/http://dsireusa.org/documents/summarymaps/net_metering_map.pdf |archive-date=2014-07-03 }}</ref> However, a 2017 study showed that only 3% of U.S. utilities offer full retail compensation for net metering with the remainder offering less than retail rates, having credit expire annually, or some form of indefinite rollover.<ref name=":20">{{Cite journal |last=Shelly |first=Chelsea |display-authors=etal |title=Examining interconnection and net metering policy for distributed generation in the United States |url=https://www.academia.edu/35065588|journal=Renewable Energy Focus |volume=22-23 |pages=10–19 |doi=10.1016/j.ref.2017.09.002 |year=2017 |bibcode=2017REneF..22...10S }}</ref>

Net metering was slow to be adopted in Europe, especially in the United Kingdom, because of confusion over how to address the [[value added tax]] (VAT). Only one utility company in Great Britain offers net metering.<ref>{{cite web |url=http://www.greenpeace.org.uk/files/pdfs/migrated/MultimediaFiles/Live/FullReport/1508.pdf |title=SolarNet and Net Metering |access-date=2013-12-15 |archive-url=https://web.archive.org/web/20130603060349/http://www.greenpeace.org.uk/files/pdfs/migrated/MultimediaFiles/Live/FullReport/1508.pdf |archive-date=2013-06-03 |url-status=dead }}</ref>

The [[United Kingdom]] government is reluctant to introduce the net metering principle because of complications in paying and refunding the value added tax that is payable on electricity, but pilot projects are underway in some areas.

In [[Canada]], some provinces have net metering programs.

In the Philippines, Net Metering scheme is governed by Republic Act 9513 (Renewable Energy Act of 2008) and its implementing  rules and regulation (IRR). The implementing body is the Energy Regulatory Commission (ERC) in consultation with the National Renewable Energy Board (NREB). Unfortunately, the scheme is not a true net metering scheme but in reality a net billing scheme. As the Dept of Energy's Net Metering guidelines say, "Net-metering allows customers of Distribution Utilities (DUs) to install an on-site Renewable Energy (RE) facility not exceeding 100 kilowatts (kW) in capacity so they can generate electricity for their own use. Any electricity generated that is not consumed by the customer is automatically exported to the DU's distribution system. The DU then gives a peso credit for the excess electricity received equivalent to the DU’s blended generation cost, excluding other generation adjustments, and deducts the credits earned to the customer’s electric bill."<ref>{{cite web|title = Net Metering Website - 1. How net-metering works: Understanding the basics of policy, regulation and standards |url=https://www.doe.gov.ph/netmeteringguide/index.php/1-how-net-metering-works-understanding-the-basics-of-policy-regulation-and-standards |website=doe.gov.ph |access-date = 2015-06-01 |first = Dart |last = Tiglao |url-status = dead |archive-url = https://web.archive.org/web/20150511193812/http://www.doe.gov.ph/netmeteringguide/index.php/1-how-net-metering-works-understanding-the-basics-of-policy-regulation-and-standards|archive-date = 2015-05-11 }}</ref>

Thus Philippine consumers who generate their own electricity and sell their surplus to the utility are paid what is called the "generation cost" which is often less than 50% of the retail price of electricity.

== Controversy ==
Net metering is controversial as it affects different interests on the grid.<ref>{{cite web|last1=Buhayar | first1=Noah |url=https://www.bloomberg.com/features/2016-solar-power-buffett-vs-musk/ |website=[[Bloomberg Businessweek]] |date=January 28, 2016| title=Who owns the sun?}}</ref> A report prepared by Peter Kind of Energy Infrastructure Advocates for the trade association Edison Electric Institute stated that [[distributed generation]] systems, like [[rooftop solar]], present unique challenges to the future of electric utilities.<ref>{{cite web |first=Peter |last=Kind |url=http://www.eei.org/ourissues/finance/Documents/disruptivechallenges.pdf |title=Disruptive Challenges: Financial Implications and Strategic Responses to a Changing Retail Electric Business |work=[[Edison Electric Institute]] |archive-url=https://web.archive.org/web/20130411194651/http://www.eei.org/ourissues/finance/Documents/disruptivechallenges.pdf |archive-date=11 April 2013 }}</ref> Utilities in the United States have led a largely unsuccessful campaign to eliminate net metering.<ref>{{cite news|url=https://www.washingtonpost.com/national/health-science/utilities-sensing-threat-put-squeeze-on-booming-solar-roof-industry/2015/03/07/2d916f88-c1c9-11e4-ad5c-3b8ce89f1b89_story.html |title=Utilities wage campaign against rooftop solar |newspaper=The Washington Post |date=2015-03-07 |access-date=2019-12-29}}</ref>

===Benefits===
Renewable advocates{{who|date=June 2019}} point out that while distributed solar and other [[Efficient energy use|energy efficiency]] measures do pose a challenge to electric utilities' existing business model, the benefits of distributed generation outweigh the costs, and those benefits are shared by all ratepayers.<ref>{{cite web|url=http://www.renewableenergyworld.com/rea/blog/post/2013/01/new-state-study-demonstrates-benefit-to-ratepayers-of-net-metering|title="New State Study Demonstrates Net Metering Benefit for Ratepayers"|website=renewableenergyworld.com"|archive-url=https://web.archive.org/web/20150510005109/http://www.renewableenergyworld.com/rea/blog/post/2013/01/new-state-study-demonstrates-benefit-to-ratepayers-of-net-metering|archive-date=2015-05-10}}</ref> Grid benefits of private distributed solar investment include reduced need for centralizing power plants and reduced strain on the utility grid. They also point out that, as a cornerstone policy enabling the growth of rooftop solar, net metering creates a host of societal benefits for all ratepayers that are generally not accounted for by the utility analysis, including: public health benefits, employment and downstream economic effects, market price impacts, grid security benefits, and water savings.<ref>{{cite web|url=http://www.oursolarrights.org/info-net-metering/net-metering-benefits/|title=Net Metering Benefits|website=oursolarrights.org}}</ref>

An independent report conducted by the consulting firm Crossborder Energy found that the benefits of California's net metering program outweigh the costs to ratepayers. Those net benefits will amount to more than US$92 million annually upon the completion of the current net metering program.<ref>{{Cite web |url=http://votesolar.org/wp-content/uploads/2013/01/Crossborder-Energy-CA-Net-Metering-Cost-Benefit-Jan-2013-final.pdf |title=votesolar.org |access-date=2014-01-06 |archive-date=2013-10-27 |archive-url=https://web.archive.org/web/20131027113042/http://votesolar.org/wp-content/uploads/2013/01/Crossborder-Energy-CA-Net-Metering-Cost-Benefit-Jan-2013-final.pdf |url-status=dead }}</ref>

A 2012 report on the cost of net metering in the State of California, commissioned by the California Public Utilities Commission (CPUC), showed that those customers without distributed generation systems will pay US$287 in additional costs to use and maintain the grid every year by 2020. The report also showed the net cost will amount to US$1.1 [[billion]] by 2020.<ref name="autogenerated1">{{cite web |url=http://www.cpuc.ca.gov/NR/rdonlyres/75573B69-D5C8-45D3-BE22-3074EAB16D87/0/NEMReport.pdf |title=cpuc.ca.gov |access-date=2013-12-04 |archive-url=https://web.archive.org/web/20131215184033/http://www.cpuc.ca.gov/NR/rdonlyres/75573B69-D5C8-45D3-BE22-3074EAB16D87/0/NEMReport.pdf |archive-date=2013-12-15 |url-status=dead }}</ref> Notably, the same report found that solar customers do pay more on their power bills than what it costs the utility to serve them (Table 5, page 10: average 103% of their cost of service across the three major utilities in 2011).<ref name="autogenerated1"/>

===Drawbacks===
Many electric utilities state that owners of generation systems do not pay the full cost of service to use the grid, thus shifting their share of the cost onto customers without distributed generation systems.<ref>{{cite web|url=http://www.bizjournals.com/phoenix/blog/energy-inc/2013/11/aps-solar-advocates-battle-for-net.html?page=all |title=APS, solar advocates battle for net metering before ACC - Phoenix Business Journal |publisher=Bizjournals.com |date=2013-11-13 |access-date=2013-12-15}}</ref> Most owners of rooftop solar or other types of distributed generation systems still rely on the grid to receive electricity from utilities at night or when their systems cannot generate sufficient power.<ref>{{cite web |url=http://www.azenergyfuture.com/net-metering/ |title=Arizona's Energy Future - Net Metering |publisher=Azenergyfuture.com |access-date=2013-12-15 |archive-url=https://web.archive.org/web/20131215181848/http://www.azenergyfuture.com/net-metering/ |archive-date=2013-12-15 |url-status=dead }}</ref>

A 2014 report funded by the [[Edison Electric Institute#Foundation|Institute for Electric Innovation]]<ref name="iei_nem">{{cite web|url=https://www.edisonfoundation.net/iei/publications/Pages/default.aspx/IEI_NEM_Subsidy_Issues_EXECSUMMARY.pdf|title=Publications|website=edisonfoundation.net}}</ref> (which engages in lobbying for the benefit of its member electricity companies) claims that net metering in California produces excessively large subsidies for typical residential rooftop solar photovoltaic (PV) facilities. These subsidies must then be paid for by other residential customers, most of whom are less affluent than the rooftop solar PV customers. In addition, the report points out that most of these large subsidies go to the solar leasing companies, which accounted for about 75 percent of the solar PV facilities installed in 2013. The report concludes that changes are needed in California, ranging from the adoption of retail tariffs that are more cost-reflective to replacing net metering with a separate "Buy All - Sell All" arrangement that requires all rooftop solar PV customers to buy all of their consumed energy under the existing retail tariffs and separately sell all of their onsite generation to their distribution utilities at the utilities' respective avoided costs.<ref>{{cite web |url=http://www.edisonfoundation.net/iei/Documents/IEI_NEM_Subsidy_Issues_FINAL.pdf |title=Net Energy Metering: Subsidy Issues And Regulatory Solutions, full report |archive-url=https://web.archive.org/web/20200511110123/https://www.edisonfoundation.net/iei/documents/IEI_NEM_Subsidy_Issues_FINAL.pdf |archive-date=2020-05-11 |work=edisonfoundation.net }}</ref>

== Post-net metering successor tariffs ==
On a nationwide basis, energy officials have debated replacement programs for net metering for several years. As of 2018, a few "replicable models" have emerged. Utility companies have always contended that customers with solar get their bills reduced by too much under net metering, and as a result, that shifts costs for keeping up the grid infrastructure to the rest of the non-solar customers. "The policy has led to heated state-level debates since 2003 over whether — and how — to construct a successor to the policy," according to Utility Dive. The key challenge to constructing pricing and rebate schemes in a post-net metering environment is how to compensate rooftop solar customers fairly while not imposing costs on non-solar customers. Experts have said that a good "successor tariff," as the post-net metering policies have been called, is one that supports the growth of distributed energy resources in a way where customers and the grid get benefits from it.<ref name=":26">{{Cite news|url=https://www.utilitydive.com/news/as-rooftop-solar-expands-states-grapple-with-successors-to-net-metering/531888/|title=As rooftop solar expands, states grapple with successors to net metering|work=Utility Dive|access-date=2018-09-14|language=en-US}}</ref>

Thirteen states swapped successor tariffs for retail rate net metering programs in 2017. In 2018, three more states made similar changes. For example, compensation in Nevada will go down over time, but today the compensation is at the retail rate (meaning, solar customers who send energy to the grid get compensated at the same rate they pay for electricity). In Arizona, the new solar rate is ten percent below the retail rate.<ref name=":26" />

The two most common successor tariffs are called "net billing" and "buy-all-sell-all" (BASA). "Net billing pays the retail rate for customer-consumed PV generation and a below retail rate for exported generation. With BASA, the utility both charges and compensates at a below-retail rate."<ref name=":26" />

== Comparison ==
[[File:Feed-in Tariff meter connections.png|thumb|upright=1.2|Net metering, unlike a feed-in tariff, requires only one meter, but it must be bi-directional.]]

There is considerable confusion{{citation needed|date=April 2019}} between the terms "net metering" and "[[feed-in tariff]]" (FIT). In general there are three types of compensation for local, distributed generation:
# Net metering: always at retail, and which is not technically compensation, although it may become compensation if there is excess generation and payments are allowed by the utility.
# Feed-in tariff: generally above retail, and reduces to retail as the percentage of adopters increases.
# [[Power purchase agreement]]: Compensation generally below retail, also known as a "Standard Offer Program", can be above retail, particularly in the case of solar, which tends to be generated close to peak demand.

Net metering only requires one meter. A feed-in tariff requires two.

== Time of use metering ==
{{Further|Smart meter}}
'''Time of use''' ('''TOU''') net metering employs a [[Smart meter|smart (electric) meter]] that is programmed to determine electricity usage any time during the day.  Time-of-use allows utility rates and charges to be assessed based on when the electricity was used (i.e., day/night and seasonal rates). Typically the generation cost of electricity is highest during the daytime peak usage period at sunset, and lowest in the middle of night.
Time of use metering is a significant issue for renewable-energy sources, since, for example, [[solar power]] systems tend to produce most energy at noon and produce little power during the daytime peak-price period (see also [[duck curve]]), and no power during the night period when price is low. California, Italy and Australia has installed so many photovoltaic cells that peak prices no longer are during the day, but are instead in the evening.<ref>{{cite web |last1=Parkinson |first1=Giles |title=Solar meets more than 100 per cent of local demand in South Australia again |url=https://reneweconomy.com.au/solar-meets-more-than-100-per-cent-of-local-demand-in-south-australia-again/ |website=RenewEconomy |archive-url= https://web.archive.org/web/20211026213929/https://reneweconomy.com.au/solar-meets-more-than-100-per-cent-of-local-demand-in-south-australia-again/ |archive-date=26 October 2021 |language=en-AU |date=25 October 2021 |url-status=live}}</ref><ref>{{cite web|url=http://www.europeanenergyreview.eu/site/pagina.php?id=3792 |title=How solar subsidies can distort the power market: the case of Italy |publisher=Europeanenergyreview.eu |access-date=2013-12-15}}</ref> TOU net metering affects the apparent cost of net metering to a utility.<ref>{{cite web |url=http://www.irecusa.org/wp-content/uploads/Final-12-GW-report-7.31.12.pdf |title=12,000 MW of Renewable Distributed Generation by 2020 |access-date=2013-12-15 |archive-url= https://web.archive.org/web/20140709052201/http://www.irecusa.org/wp-content/uploads/Final-12-GW-report-7.31.12.pdf |archive-date=2014-07-09 |url-status=dead }}</ref>

== Market rate net metering ==
{{Further|Vehicle-to-grid}}
In '''market rate net metering''' systems the user's energy use is priced dynamically according to some function of wholesale electric prices. The users' meters are programmed remotely to calculate the value and are read remotely. Net metering applies such variable pricing to excess power produced by a qualifying system.

Market rate metering systems were implemented in California starting in 2006, and under the terms of California's net metering rules will be applicable to qualifying photovoltaic and wind systems. Under California law the payback for surplus electricity sent to the grid must be equal to the (variable, in this case) price charged at that time.

Net metering enables small systems to result in zero annual net cost to the consumer provided that the consumer is able to shift demand loads to a lower price time, such as by chilling water at a low cost time for later use in air conditioning, or by charging a [[battery electric vehicle]] during [[Off-peak electricity|off-peak]] times, while the electricity generated at peak demand time can be sent to the grid rather than used locally (see [[Vehicle-to-grid]]). No credit is given for annual surplus production.

== Excess generation ==
Excess generation is a separate issue from net metering, but it is normally dealt with in the same rules, because it can arise. If local generation offsets a portion of the demand, net metering is not used. If local generation exceeds demand some of the time, for example during the day, net metering is used. If local generation exceeds demand for the billing cycle, best practices calls for a perpetual roll over of the kilowatt-hour credits, although some regions have considered having any kWh credits expire after 36 months. The normal definition of excess generation is annually, although the term is equally applicable monthly. The treatment of annual excess generation (and monthly) ranges from lost, to compensation at avoided cost, to compensation at retail rate.<ref name=:0/>> Left over kWh credits upon termination of service would ideally be paid at retail rate, from the consumer standpoint, and lost, from the utility standpoint, with avoided cost a minimum compromise. Some regions allow optional payment for excess annual generation,<ref>Colorado, Delaware, Minnesota, New Mexico, and Virginia allow optional annual payment for excess generation.</ref> which allows perpetual roll over or payment, at the customers choice. Both wind and solar are inherently seasonal, and it is highly likely to use up a surplus later, unless more solar panels or a larger wind turbine have been installed than needed.

==Energy storage==
Net metering systems can have energy storage integrated, to store some of the power locally (i.e. from the renewable energy source connected to the system) rather than selling everything back to the mains electricity grid. Often, the batteries used are industrial [[deep cycle batteries]] as these last for 10 to 20 years.<ref>{{cite web|url=https://www.solar-electric.com/learning-center/deep-cycle-battery-faq.html/|title=Deep Cycle Battery FAQ|website=Northern Arizona Wind & Sun}}</ref> Lead-acid batteries are often also still used, but last much less long (5 years or so). Lithium-ion batteries are sometimes also used, but too have a relatively short lifespan. Finally, [[Nickel-iron battery|nickel-iron batteries]]<ref>{{cite web|url=http://www.nickel-iron-battery.com/|title=nickel iron battery information|website=nickel-iron-battery.com}}</ref> last the longest with a lifespan of up to 40 years.<ref>{{cite web|url=http://www.beutilityfree.com/index.php/resources/the-utilityfree-home|title=The UtilityFree™ Home|website=beutilityfree.com}}</ref><ref>{{cite web|url=http://www.agofuelcells.com/|title=AGO Fuel Cells – Renewable Energy research and development.}}</ref><ref>{{cite web|url=https://ironedison.com/|title=Nickel & Lithium Iron Provider in USA &#124; Buy Edison Battery Online|website=ironedison.com}}</ref> A 2017 study of solar panels with battery storage indicated an 8 to 14 percent extra consumption of electricity from charging and discharging batteries.<ref>{{cite web|url=http://www.engr.utexas.edu/news/archive/8198-energy-storage|title=Storing Solar Power Increases Energy Consumption and Emissions, Study Finds|website=engr.utexas.edu|date=30 January 2017 }}</ref>

==Adoption by country==
=== Australia ===
{{main|Feed-in tariffs in Australia}}
In some Australian states, the "feed-in tariff" is actually net metering, except that it pays monthly for net generation at a higher rate than retail, with Environment Victoria Campaigns Director Mark Wakeham calling it a "fake feed-in tariff."<ref>{{cite web |url=http://www.metering.com/node/12433 |title=Solar feed-in tariff meets with mixed reviews |publisher=Metering.com |access-date=2013-12-15 |url-status=dead |archive-url=https://web.archive.org/web/20130528194314/http://www.metering.com/node/12433 |archive-date=2013-05-28 }}</ref> A feed-in tariff requires a separate meter, and pays for all local generation at a preferential rate, while net metering requires only one meter. The financial differences are very substantial.

In Victoria, from 2009, householders were paid 60 cents for every excess kilowatt hour of energy fed back into the state electricity grid. This was around three times the retail price for electricity at that time. However, subsequent state governments reduced the feed-in in several updates, until in 2016 the feed-in is as low as 5 cents per kilowatt hour.

In Queensland starting in 2008, the Solar Bonus Scheme pays 44 cents for every excess kilowatt hour of energy fed back into the state electricity grid. This is around three times the current retail price for electricity. However, from 2012, the Queensland feed in tariff has been reduced to 6-10 cents per kilowatt hour depending on which electricity retailer the customer has signed up with.

Australian smart grid technologist, Steve Hoy, originated the opposing concept of "True Zero", as opposed to "Net Zero", to express the emerging capability to trace electricity through net metering. The meter allows consumers to trace their electricity to the source, making clean energy more accessible to everyone.<ref>{{Cite web|title=Net zero no more: We are entering the era of honest electricity|url=https://www.canarymedia.com/articles/clean-energy/net-zero-no-more-we-are-about-to-enter-the-era-of-honest-electricity|access-date=2021-10-18|website=Canary Media|date=26 May 2021 |language=en}}</ref>

=== Canada ===
[[Ontario]] allows net metering for systems up to 500&nbsp;kW, however credits can only be carried for 12 consecutive months. Should a consumer establish a credit where they generate more than they consume for 8 months and use up the credits in the 10th month, then the 12-month period begins again from the date that the next credit is shown on an invoice. Any unused credits remaining at the end of 12 consecutive months of a consumer being in a credit situation are cleared at the end of that billing.<ref>{{cite web |url=http://www.energy.gov.on.ca/english/pdf/renewable/NetMeteringBrochure.pdf |title=Net Metering in Ontario|archive-url=https://web.archive.org/web/20090318230718/http://www.energy.gov.on.ca/english/pdf/renewable/NetMeteringBrochure.pdf |archive-date=18 March 2009}}</ref>

Areas of [[British Columbia]] serviced by BC Hydro are allowed net metering for up to 100&nbsp;kW.  At each annual anniversary on March 1 the customer is paid a market price, calculated as daily average mid-Columbia price for a previous year.<ref name="test">{{cite web|url=https://www.bchydro.com/netmetering |title=BC Hydro's Net Metering Program}}</ref>   FortisBC which serves an area in South Central BC also allows net-metering for up to 50&nbsp;kW. Customers are paid their existing retail rate for any net energy they produce.<ref>{{cite web |url=http://www.fortisbc.com/Electricity/CustomerService/NetMeteringProgram/Pages/default.aspx |work=FortisBC |title=Net metering program |access-date=15 April 2013 }}</ref> The City of New Westminster, which has its own electrical utility, also allows net metering.<ref>{{cite web |url=https://www.newwestcity.ca/services/electrical-utility/sb_expander_articles/871.php |title=Electrical Net Metering Program |date=Aug 13, 2018 |access-date=Aug 13, 2018}}</ref>

[[New Brunswick]] allows net metering for installations up to 100&nbsp;kW. Credits from excess generated power can be carried over until March at which time any excess credits are lost.<ref>{{cite web|url=http://www.nbpower.com/html/en/save_energy/renewable_projects/net_metering/net_metering.html |title=Net Metering |publisher=Nbpower.com |access-date=2013-12-15}}</ref>

[[SaskPower]] allows net metering for installations up to 100&nbsp;kW. Credits from excess generated power can be carried over until the customer's annual anniversary date, at which time any excess credits are lost.

In Nova Scotia, in 2015, 43 residences and businesses began using solar panels for electricity. By 2017, the number was up to 133. These customers’ solar systems are net metered. The excess power produced by the solar panels is bought back from the homeowner by Nova Scotia Power at the same rate that the utility sells it to its customers. “The downside for [[Nova Scotia Power]] is that it must maintain the capacity to produce electricity even when it is not sunny.”<ref>{{cite web |url=http://thechronicleherald.ca/business/1545779-solar-panel-installation-heating-up-in-nova-scotia |title=Solar panel installation heating up in Nova Scotia |date=2018-02-14 |website=The Chronicle Herald |language=en |access-date=2018-02-16 |archive-url=https://web.archive.org/web/20180217024142/http://thechronicleherald.ca/business/1545779-solar-panel-installation-heating-up-in-nova-scotia |archive-date=2018-02-17 |url-status=dead }}</ref>

=== European Union ===
Denmark established net-metering for privately owned PV systems in mid-1998 for a pilot-period of four years. In 2002 the net-metering scheme was extended another four years up to end of 2006. Net-metering has proved to be a cheap, easy to administer and effective way of stimulating the deployment of PV in Denmark; however the relative short time window of the arrangement has so far prevented it from reaching its full potential. During the political negotiations in the fall of 2005 the net-metering for privately owned PV systems was made permanent.<ref>{{cite web |url=http://www.iea-pvps.org/ar/ar07/07ar_Denmark.pdf |title=Denmark PV Technology Status and Prospects |archive-url=https://web.archive.org/web/20080908054452/http://www.iea-pvps.org/ar/ar07/07ar_Denmark.pdf |archive-date=8 September 2008}}</ref>

The Netherlands has net-metering since 2004.<ref>[https://zoek.officielebekendmakingen.nl/kst-29372-45.html officielebekendmakingen.nl], ''Wijziging van de Elektriciteitswet 1998 en de Gaswet ter uitvoering van richtlijn nr. 2003/54/EG'' (in Dutch)</ref> Initially there was a limit of 3000 kWh per year. Later this limit was increased to 5000 kWh. The limit was removed altogether on January 1, 2014.<ref>[https://zoek.officielebekendmakingen.nl/kst-33493-C.html officielebekendmakingen.nl], ''Wijziging van de Elektriciteitswet 1998, de Gaswet en de Warmtewet en de Warmtewet'' (in Dutch)</ref>

Italy offers a support scheme, mixing net-metering and a well segmented premium  [[Feed-in tariff|FiT]].<ref>{{cite web |url=http://ec.europa.eu/economy_finance/events/2009/20091120/epia_en.pdf |title=2013 Global Market Outlook for Photovoltaics until 2013 |access-date=2013-12-15}}</ref>

Slovenia has annual net-metering since January 2016 for up to 11 kVA. In a calendar year up to 10 MVA can be installed in the country.<ref>[http://www.uradni-list.si/1/objava.jsp?sop=2015-01-3804 uradni-list.si], ''Uredba o samooskrbi z električno energijo iz obnovljivih virov energije'' (in Slovene)</ref>

In 2010, [[Renewable energy in Spain|Spain, net-metering]] has been proposed by the ''Asociación de la Industria Fotovoltaica'' (ASIF) to promote [[renewable electricity]], without requiring additional economic support.<ref>{{cite web|url=http://www.epia.org/policy/national-policies/spain/interview-with-the-national-pv-associations/interview-with-javier-anta-president-of-asif.html |title=Country Focus: Spain |archive-url=https://web.archive.org/web/20100225153308/http://www.epia.org/policy/national-policies/spain/interview-with-the-national-pv-associations/interview-with-javier-anta-president-of-asif.html |archive-date=25 February 2010}}</ref> Net-metering for privately owned systems will be established in 2019, after Royal Decree 244/2019<ref>[https://boe.es/boe/dias/2019/04/06/pdfs/BOE-A-2019-5089.pdf boe.es] ''Boletín Oficial del estado''</ref> was accepted by the government on April 5.<ref>[https://www.eldiario.es/ballenablanca/transicion_energetica/Guia-nuevas-autoconsumo-ahorrar-solares_0_885411703.html eldiario.es]; ''Guía de las nuevas reglas de autoconsumo: cómo ahorrar con unas placas solares en casa''</ref>

Some form of net metering is now proposed by ''[[Électricité de France]]''. According to their website, energy produced by home-owners is bought at a higher price than what is charged as consumers. Hence, some recommend to sell all energy produced, and buy back all energy needed at a lower price. The price has been fixed for 20 years by the government.<ref>{{cite web |url=http://bleuciel.edf.com/projets-et-travaux/je-passe-aux-energies-renouvelables/decouvrir-4-solutions-48030.html#open4 |title=Je passe aux énergies renouvelables |archive-url=https://web.archive.org/web/20120421210127/http://bleuciel.edf.com/projets-et-travaux/je-passe-aux-energies-renouvelables/decouvrir-4-solutions-48030.html#open4 |archive-date=2012-04-21 |lang=fr |work=bleuciel.edf.com }}</ref><ref>{{cite web |work=bati-depot.fr |url=http://www.bati-depot.fr/solaire/photovoltaique/electricite-solaire/photovoltaique-connexion-reseau.html |title=Devenez producteur d'électricité |archive-url=https://web.archive.org/web/20070208220615/http://www.bati-depot.fr/solaire/photovoltaique/electricite-solaire/photovoltaique-connexion-reseau.html |archive-date=8 February 2007 |language=French }}</ref>

Ireland is planning to implement a net metering system, under the "Micro-generation Support Scheme".

Under the proposed scheme, micro-generators can sell 30% of the excess electricity they produce and export it back to the grid. The price that electricity will be sold at is being formulated during the consultation process.<ref>{{Cite web |last=McCormack|first=Cian|date=2021-02-04|title=Scheme to sell electricity expected by summer|url=https://www.rte.ie/news/environment/2021/0204/1194990-electric-grid/ |work=rte.ie |language=en}}</ref>

[[Poland]] has introduced net metering for private and commercial renewable energy sources of up to 50&nbsp;kW in 2015.<ref>{{Cite web|url=http://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=wdu20150000478|title = Ustawa z dnia 20 lutego 2015 r. O odnawialnych źródłach energii}}</ref> Under this legislation energy sent to grid must be used within one year from feed-in, otherwise it is considered as lost. The amount of energy that was exported and can be taken back by the user is subtracted by 20% for installations up to 10&nbsp;kW, or by 30% for installations up to 50&nbsp;kW. This legislation guarantees that this net metering policy will be kept for a minimum of 15 years from the moment of registering renewable energy source. This legislation together with government subsidies for microgeneration created a substantial boost in installations of [[Solar power in Poland|PV systems in Poland]].

Portugal has a very limited form of "net-metering" that is constrained to 15 minute periods where the excess injected in the grid is not compensated when above the consumption from the grid within each 15 minute period. Only the injected energy up to the consumed energy within the same 15 minute period is netted out of the final monthly bill. In fact the old analog electricity meters that would allow for true net-metering are immediately replaced when a consumer installs solar pv.

=== India ===
Almost every state in India has implemented net-metering,<ref>{{cite news|url=https://www.bijlibachao.com/using-renewables/net-metering-policy-for-roof-top-pvs-in-various-states-in-india.html|title=Net Metering policy for roof top PVs in various states in India|date=2014-01-16|website=Bijli Bachao|language=en-US|access-date=2019-05-20}}</ref> wherein, the consumers are allowed to sell the surplus energy generated by their solar system to the grid and get compensated for the same. However, the net-metering policy is not common throughout the country and varies from state to state.

To avail of net-metering in the country, the consumer is required to submit an application with the local electricity distribution company along with the planned rooftop solar project and requisite fee. The distribution company reviews the application and the feasibility of the solar project, which is either approved or rejected. If approved, another application for registration of the rooftop is submitted to the distribution company. An agreement is signed between the consumer and the company, and the net-meter is installed.

The Indian states of Karnataka and Andhra Pradesh have started the implementation of net metering, and the policy was announced by the respective state electricity boards in 2014. After review and inspection by the electricity board, a bidirectional meter is installed. Applications are taken up for up to 30% of the distribution transformer capacity on a first-come, first-served basis and technical feasibility.<ref>{{cite web |publisher=Tamilnadu TNERC |url=http://vinova.in/Solar-NetMetering.pdf |title=Net Metering India |url-status=dead |archive-url=https://web.archive.org/web/20150210111155/http://vinova.in/Solar-NetMetering.pdf |archive-date=2015-02-10 }}</ref>

Since September 2015, Maharashtra state (MERC) has also had a net metering policy and consumers have started installation of Solar Rooftop Grid Tie Net metering systems. MERC Policy allows up to 40% transformer capacity to be on Solar net metering.<ref>{{cite web|url=https://www.mahadiscom.in/|title=:: Maharashtra State Electricity Distribution Company Limited :: – MahaVitaran}}</ref>

The various DISCOMs in Maharashtra namely MSEDCL, Tata, Reliance and Torrent Power are expected to support net metering.

As of now MSEDCL does not use the TOD (Time of The Day differential) charging tariffs for residential consumers and net metering. Export and import units are considered at par for calculating Net Units and bill amount.

=== United States ===
{{excerpt|Net metering in the United States}}

== Net purchase and sale ==
'''Net purchase and sale''' is a different method of providing power to the electricity grid that does not offer the price symmetry of net metering, making this system a lot less profitable for home users of small [[renewable electricity]] systems.

Under this arrangement, two uni-directional meters are installed—one records electricity drawn from the grid, and the other records excess electricity generated and fed back into the grid. The user pays retail rate for the electricity they use, and the power provider purchases their excess generation at its avoided cost (wholesale rate). There may be a significant difference between the retail rate the user pays and the power provider's avoided cost.<ref>{{cite web|publisher=U.S. Department of Energy |url=http://www.eere.energy.gov/consumer/your_home/electricity/index.cfm/mytopic=10600 |archive-url=https://web.archive.org/web/20080622010101/http://www.eere.energy.gov/consumer/your_home/electricity/index.cfm/mytopic%3D10600|title=EERE Consumer's Guide: Metering and Rate Arrangements for Grid-Connected Systems |date= September 12, 2005 |access-date= 23 January 2006 |url-status=dead |archive-date=22 June 2008}}</ref>

Some countries, such as Germany, Spain, Ontario (Canada), and some states in the United States, compensate the generated electricity at a fixed rate, in a scheme called [[feed-in tariff]] (FIT). With the FIT, customers get paid for any electricity they generate from renewable energy on their premises. The actual electricity being generated is counted on a separate meter, not just the surplus they feed back to the grid. Germany once paid several times the retail rate for solar but has reduced the rates drastically while actual installation of solar has grown exponentially at the same time due to reduced cost of solar installations. Wind energy, in contrast, only receives around a half of the domestic retail rate, because the German system pays what each source costs (including a reasonable profit margin).

== Virtual net metering ==
Another method of producing power to the grid is through '''virtual net metering''' (also called peer-to-peer (P2P) energy trading, wheeling and sometimes local energy trading).<ref>{{cite web |url=http://apvi.org.au/solar-research-conference/wp-content/uploads/2017/02/A-Roy-A-Bruce-I-MacGill-Potential-Value-of-Peer-To-Peer-Energy-Trading-in-the-Australian-National-Electricity-Market.pdf |title=The Potential Value of Peer-to-Peer Energy Trading in the Australian National Electricity Market }}</ref> Peer-to-peer energy trading is a novel paradigm of power system operation, where sellers can generate their own energy in dwellings, offices and factories, and share it with each other locally.<ref>{{cite web |url=https://www.researchgate.net/publication/317305842 |title=Review of Existing Peer-to-Peer Energy Trading Projects }}</ref><ref>{{cite web |url=https://www.cpuc.ca.gov/General.aspx?id=5408 |work=cpuc.ca.gov |title=Virtual Net Metering }}</ref><ref>{{cite web |url=https://medium.com/swlh/understanding-p2p-energy-trading-a477eb7b55e0 |title=Understanding P2P Energy Trading |work=medium.com |date=23 July 2021 }}</ref><ref>{{cite web |url=https://www.energymatters.com.au/misc/peer-to-peer-solar-energy-trading-guide/ |title=Peer-To-Peer Solar Energy Trading: A Guide |work=energymatters.com.au }}</ref> Several companies offering virtual net metering use blockchain technology.<ref>[https://www.fastcompany.com/40479952/this-blockchain-based-energy-platform-is-building-a-peer-to-peer-grid "This Blockchain-Based Energy Platform Is Building A Peer-To-Peer Grid"], ''Fast Company''.</ref>

== Related technology ==
Sources that produce [[direct current]], such as [[Photovoltaic module|solar panel]]s, must be coupled with an [[Inverter (electrical)|electrical inverter]] to convert the output to [[alternating current]] for use with conventional appliances. The phase of the outgoing power must be synchronized with the grid, and a mechanism must be included to disconnect the feed in the event of grid failure. This is for safety{{spaced ndash}} for example, workers repairing downed power lines must be protected from "downstream" sources, in addition to being disconnected from the main "upstream" distribution grid. Although a small generator lacks the power to energize a loaded line, this can happen if the line is isolated from other loads. [[Solar inverter]]s are designed for safety{{spaced ndash}} while one inverter could not energize a line, a thousand might. In addition, electrical workers are trained to treat every line as though it was live, even when they know it should be safe.<ref>{{cite web|url=http://www.statefundca.com/safety/safetymeeting/SafetyMeetingArticle.aspx?ArticleID=23 |title=Know the Ground Rules for Electrical Safety |publisher=State Compensation Insurance Fund, California |access-date=2013-12-15 |archive-url=https://web.archive.org/web/20130617230951/http://statefundca.com/safety/safetymeeting/SafetyMeetingArticle.aspx?ArticleID=23 |archive-date=2013-06-17 |url-status=dead}}</ref><ref>{{cite web|url=http://www.safetyservicescompany.com/blog/electrical-safety-lineman-electrocuted-after-reportedly-violating-the-%E2%80%9Chot-gloves%E2%80%9D-rule|archive-url=https://web.archive.org/web/20110911180919/http://www.safetyservicescompany.com/blog/electrical-safety-lineman-electrocuted-after-reportedly-violating-the-%E2%80%9Chot-gloves%E2%80%9D-rule|url-status=dead|title=Electrical Safety: Lineman Electrocuted after Reportedly Violating the 'Hot Gloves' Rule|archive-date=September 11, 2011}}</ref>

== Solar guerrilla ==
'''Solar guerrilla''' (or the ''guerrilla solar movement'') is a term originated by ''[[Home Power Magazine]]'' and is applied to someone who connects solar panels without permission or notification and uses monthly net metering without regard for law.<ref>{{cite news |date=1 February 2001 |title=The Guerrilla Solar Movement |work=Mother Earth News |url=https://www.motherearthnews.com/renewable-energy/the-guerrilla-solar-movement-zmaz01zsel |access-date=19 April 2021}}</ref>

==  See also ==
<!---♦♦♦ Please keep the list in alphabetical order ♦♦♦---> 
* [[Automatic meter reading]]
* [[Demand response]]
* [[Electricity meter]]
* [[Home energy upgrades from public utilities]]
* [[Interstate Renewable Energy Council]]
* [[Off-the-grid]]
* [[Power system automation]]
* [[Smart grid]]
* [[Uninterruptible power supply]]
* [[Utility submeter]]
* [[Variable pricing]]
* [[Virtual power plant]]

== Notes ==
{{NoteFoot}}

== References ==
{{Reflist}}

==External links==
* [https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/net-energy-metering/virtual-net-metering Virtual Net Metering] - [[California Public Utilities Commission]].

{{Electricity generation}}

[[Category:Renewable energy policy]]
[[Category:Renewable energy economics]]
[[Category:Energy storage]]
[[Category:Pricing]]