Proposal:Power generation storage/Appendix
 | The following page serves as an appendix to the Proposal:Power generation storage. |
Rationale
Plant & generator source
General reasoning
Today, plants and generators tagging seems to mix up energy sources, energy fields, and methods, leading to inconsistent use of plant:source and generator:source.
In some cases, plant:source describes :
| which industry the energy belongs to | plant:source=nuclear
|
| where the energy comes from | plant:source=coal
|
| how the energy is converted | plant:source=battery
|
This creates ambiguity between natural origin, method, and sector classification.
- Which industry the energy belongs to: meaning the sector or branch of the energy industry that groups activities and systems based on a common source of energy, i.e. the source.
- Where the energy comes from: meaning the substance or flow put into the plant or generator to produce energy, i.e. the input ;
- How the energy is converted: meaning the physical or technological process used to convert that source into usable energy, i.e. the method.
To address these confusions, it is proposed to create additional values and reorganise the tagging with plant:source.
This proposal does not affect the following existing tags which are intended to remain as they are:
Note: plant:source and generator:source are treated together in the following section, as they follow the exact same logic and structure.
Source-specific values
Bioenergy plant & generator
It is proposed to group the current biomass, biofuel and biogas under a single plant:source=bioenergy.
This new bioenergy tag would bring tagging closer to how the energy sector defines these systems. All of them share the same biological origin, which is energy derived from organic matter or its residues, even if the materials and conversion processes differ.
Using bioenergy clarifies that the energy field is bio-based. The current biomass, biofuel and biogas would not be lost as they are valuable to indicate the substances going into the plant or generator.
See the #Input & output section below for further details.
Grid
This refers to technologies that convert electrical energy coming from the grid into another form such as chemical, gaseous, or thermal energy.
It is thus proposed to introduce plant:source=grid.
Within this field, three main methods are identified: battery, compression, and resistive.
It is proposed that the existing plant:source=battery tag is redefined, as batteries are not an energy source or input but a method of storing and converting electrical energy.
Fossil plant & generator
It is proposed to group the current coal, oil, gas, gasoline, and diesel under a single plant:source=fossil.
These fuels are not distinct energy sources but rather different inputs within the same energy field. They all originate from fossil carbon and are used in similar thermal or combustion-based processes. Many power plants operate on multi-fuel (coal-gas, or oil-gas for instance).
Using fossil makes the tagging clearer by distinguishing the overall energy source from the specific fuel type used. The current coal, oil, gas, gasoline, and diesel remain useful as input=* values to describe the actual fuel feeding the plant or generator.
See the #Input & output section below for further details.
See the #Plant & generator method section below for further details.
Alternative approaches considered
Several alternative ways of reorganising the plant:source values were examined during the drafting of this proposal but were dismissed.
A renewable / non-renewable split was irrelevant because it is based on political or environmental definitions that evolve over time and differ between countries. Furthermore, such a distinction raises issues around how to classify certain energy types. For instance, waste plants use organic, domestic or industrial waste that can partly originate from renewable sources. However, their environmental perception is often mixed due to their reliance on combustion. Similarly, nuclear energy makes classification difficult: it is technically low-carbon but not considered renewable under most definitions.
A thermal / non thermal split was also excluded. Thermal refers to a conversion process, not to an energy source. While conventional fossil plants and nuclear plants are thermal, only some (but not all) bio energy systems are. Similarly, plant:source=solar plants can be thermal, but not all are. This would lead up to a mix up between unrelated technologies and methods.
A combustion / non-combustion split was dismissed because it would merge fossil fuels and bio energies under the same label despite their different origins. Combustion is already represented through plant:method, and duplicating it at the source level would add redundancy at best, and confusion at worst.
A fossil/bioenergy classification has been studied for fossil fuels and bio energies and was then discarded.
Even if equivalences exist between fossil fuels and bio energy, solid-liquid-gazeous wasn't an appropriate selection.
It's better to keep fossil and bio energies with their own sources.
---
More abstract distinctions such as mechanical vs. electromagnetic or primary vs. secondary energy were found too conceptual for practical mapping. These classifications are relevant in energy modeling but not meaningful for OSM tagging.
This is why this proposal includes a more practical framework by defining plant:source and generator:source on how energy is physically produced, rather than on policy, environmental, or conceptual classifications that can shift over time or create overlap between tags.
Plant & generator method
Logic and usage
The core logic and usage of both plant:method=* & generator:method=* remain unchanged. It is proposed that both tags remain recommended, except for wind systems where only one method is possible.
Source-specific values
Geothermal
Until now, geothermal power plants and generators did not have a defined method, though they geothermal generators can be tagged with two values for generator:type=* as follows : steam_turbine or heat_pump.
These two technologies are linked to two methods and reflects the operational differences within the geothermal field.
It is thus proposed to introduce:
(1) plant:method=turbine & generator:method=turbine. The latter combines with the proposed generator:technology=steam_turbine. Turbine-based geothermal systems use high-temperature steam from underground reservoirs to drive turbines, generating electricity in a way similar to conventional thermal power plants.
(2) plant:method=compression & generator:method=compression. The latter combines with the proposed generator:technology=heat_pump. Compression-based systems, by contrast, operate at lower temperatures, using heat pumps to capture and upgrade geothermal heat for direct use or district heating.
Nuclear
A nuclear power plant operates as a chain of generators: the fission or fusion process in the reactor produces heat, which is transferred through a heat exchanger to a secondary circuit containing water. This water is converted into steam, which drives a turbine generator to produce electricity. Sometimes, additional heat exchangers use part of the generated energy to produce hot water for district heating or industrial use.
Tagging these intermediate conversion steps separately is optional. It better represents the physical and thermal processes that occur inside a nuclear plant. It is useful as the heat is called to be used outside of the plant, for district or industrial heating purposes beside the produced electricity.
This same logic is applied in the section below on main and internal generators, where the flow of energy between interconnected systems is made explicit.
Thus, it is proposed to use two generic values that fit generators within nuclear plants and can also apply to other energy sources, such as the turbines used in wave plants and wind farms:
Exchange
The generator:method=exchange method models the steam generation out of high pressurized hot water. Such steam generation is intended to keep the radioactive and nonradioactive waters separated.
Turbine
The generator:method=turbine method uses steam from the secondary circuit to drive a turbine connected to a generator, converting thermal energy into electricity.
They are added to the existing fission & fusion methods.
Note: Every component of the generators chain and the whole plant are tagged with plant:source=nuclear as to keep track of the whole industry they take place in.
Grid
New plant:source=grid & generator:source=grid are proposed in the above sections. Alongside them, it is proposed to add three associated methods that reflect the main principles used to convert electricity into other forms of storable or usable energy:
plant:method=battery&generator:method=battery,plant:method=compression&generator:method=compression- and
plant:method=resistive&generator:method=resistive.
Battery
The battery method describes systems such as Power-to-Power (p2p) that store electrical energy and release it back to the grid when needed, such as battery energy storage systems (BESS). It is proposed that the current plant:source=battery is essentially revised into battery. Energy contributors are already familiar with this concept, which is now redefined to align more logically with how batteries function: as a method of storing and releasing energy, rather than a primary energy source. It combines with the existing generator:type=lithium-ion, lead-acid, nickel-cadmium, redox_flow, molten-salt.
Compression
The compression method describes systems that use electricity to drive compressors or heat pumps, converting electrical energy into chemical or thermal energy. This includes Power-to-Hydrogen (P2H₂) systems as well as Power-to-Heat applications, where compression is used to produce hot water or heating. It combines with the existing generator:type=heat_pump.
Resistive
The resistive method represents direct conversion of electricity into heat through resistive (Joule) heating. It applies to systems such as electric boilers or Power-to-Heat installations that generate hot water or steam for district heating or industrial use. It combines with the existing generator:type=boiler.
Solar
Solar photovoltaics refers to the direct conversion of sunlight into electricity through semiconductor materials, most commonly silicon-based cells. This process occurs without any moving parts or intermediate heat transfer, which distinguishes it from the solar thermal methods of energy generation.
The term photovoltaic (without “s”) is an adjective, while the correct noun for the method itself is photovoltaics (with "s").
It is proposed to correct the current plant:method=photovoltaic & generator:method=photovoltaic to plant:method=photovoltaics & generator:method=photovoltaics respectively. This would allow tagging in OpenStreetMap to be aligned with the proper term used in the energy field.
Solar thermal plants and generators remain unchanged under this proposal.
Tidal
Tidal plants and generators currently have two associated methods : barrage & stream.
In tidal range systems, energy is generated by capturing and storing seawater during high tide, then releasing it through turbines as the tide falls. This process relies on the creation of a controlled water level difference : a form of temporary potential energy storage. The term barrage describes the physical structure used to hold back the water, not the actual energy conversion principle.
water_storage more accurately represents this mechanism and already exists as a method for hydro plants and generators.
It is thus proposed to deprecate barrage and replace it with water_storage for tidal power plants and generators.
Wave
Wave power plants and generators currently have no specific method associated with them in existing tagging.
It is proposed to introduce two methods : rebound & turbine, to reflect the main physical principles used to convert wave motion into usable energy.
Rebound
With the rebound method, energy is captured through the direct mechanical movement of devices that float or flex with the motion of the sea, that is then converted into hydraulic or electrical energy.
Turbine
With the turbine method, energy is harnessed through the movement of air or water set in motion by waves, which drives a turbine connected to a generator. Turbine-based methods rely on fluid dynamics rather than structural motion to generate electricity.
Wind
Wind farms are currently tagged with plant:method=wind_turbine and generators with a similar generator:method=wind_turbine.
Every wind generator is, by definition, a turbine. A wind turbine converts the kinetic energy of moving air into rotational energy, which is then converted into electricity. This process is identical across all wind technologies ((horizontal_axis or vertical_axis), regardless of size or model. That means that using a single, generic turbine method accurately represents this universal conversion principle without adding redundant detail.
Thus, it is proposed to deprecate both plant:method=wind_turbine & generator:method=wind_turbine.
Note: Because all wind generators operate through a turbine mechanism, it is suggested that tagging the method for wind plants and generators becomes optional. However, keeping a turbine method remains useful to maintain consistency across all energy sources.
Plant & generator storage
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Power storage plants and generators are facilities that store energy for later use, which helps balance supply and demand in power grids. They can rely on various technologies, such as hydroelectric pumped storage, compressed air, flywheels, and more recently, large-scale battery energy storage systems (BESS).
It is thus proposed to create two new keys:
plant:storagefor energy storage plants, andgenerator:storagefor generators with integrated storage units.
The value of both should be a measure of energy, usually in Megawatt-hours (MWh) or Gigawatt-hours (GWh), for example plant:storage=100 MWh. This value is normally published by the operator in the case of battery plants, and sometimes in the case of pumped-storage plants.
If the capacity is unknown, plant:storage=yes or generator:storage=yes can be used.
These tags complement existing plant:output and generator:output by describing storage capacity rather than production capacity. They do not replace existing generation tags but add missing information about energy retention.
Generator technology
General reasoning
The suffix *:type is not to be confused with type which is primarily used for relation typing, rather than classifying equipment.
*:type is a value-based format used to describe variants of objects, but not specifically suited to industrial or energy infrastructure. Its definition is vague and based on convention rather than clear classification.
generator:type seems to be the most used *:type key:
The detail of the values can be found in section the Tags to be replaced section.
*:type=* is more and more considered outdated, and tagging practices are gradually moving away from its use.
Thus, it is proposed that the generator:type is replaced by a new Template:KTagKeyey tag.
To keep tagging simple for non-expert contributors, it is proposed that this tag is optional, with no mandatory cases.
Most current generator:type values are to remain unchanged (with the exceptions explained below).
In addition, this proposal introduces or revises several technology values for specific power generator sources or methods, including nuclear, grid, photovoltaics, and wave.
It is also proposed to replace steam_generator with steam_boiler (except for nuclear power plants).
The current value steam_generator does not accurately describe most thermal systems, as a steam generator typically lacks a combustion chamber. It heats pressurised water, which in turn produces steam in a secondary, atmospheric-pressure loop.
Replacing it with steam_boiler for thermal conventional plants introduces the missing distinction and aligns tagging with actual equipment.
This would allow modelling of different technologies, as follows :
Source-specific values
Grid
The battery-related technologies coupled with generator:method=battery remain unchanged.
Two additional technologies are proposed for the two newly introduced grid method. Both are already in use with other generator sources, so no new tags need to be created.
Heat pump
It is proposed to associate generator:technology=heat_pump with the compression method. This technology is already used with geothermal systems. It uses electrical energy to drive a compressor that transfers heat from a lower-temperature source to a higher-temperature output. In grid systems, this process converts electricity into heat for district heating, industrial applications, or thermal storage. Extending this existing tag here is technically correct and avoids redundant values for the same physical process.
Boiler
It is proposed to associate generator:technology=boiler with the resistive method. A boiler converts electricity into heat by resistive (Joule) heating, producing hot water or steam. This technology is already in use for combustion-based generators and serves a similar thermal role here. The difference is that the heat source is electrical instead of chemical.
Nuclear
In addition to the existing technologies linked to the fission & fusion methods, it is proposed to add two more technologies for the newly introduced exchange & turbine methods in nuclear power plants.
Steam generator
It is proposed to couple exchange with generator:technology=steam_generator.
steam_generator already exists as a tagging value and is commonly used in combustion-based plants. In nuclear facilities it performs a similar thermodynamic function : transferring heat from the reactor’s primary loop to the secondary water circuit. The steam generator acts as a heat exchanger, ensuring that radioactive coolant and non-radioactive steam remain physically separated while allowing efficient heat transfer.
Steam turbine
It is proposed to couple turbine with generator:technology=steam_turbine.
steam_turbine is likewise already in use for thermal and combustion power plants and can be directly applied to the turbine in nuclear systems.
After the steam generator stage, steam expands through a turbine that drives an electrical generator. It is the same fundamental process as in conventional thermal plants.
Solar photovoltaics
For solar photovoltaic generators, it is proposed to deprecate generator:technology=solar_photovoltaic_panel, which is currently the only approved value. This tag is redundant with generator:source=solar and generator:method=photovoltaics, as all photovoltaic generators are by definition composed of solar panels. Its continued use does not add any technical or descriptive value and creates unnecessary repetition in tagging. Deprecating it will simplify the schema and make room for more meaningful distinctions between different photovoltaic technologies based on their material and conversion efficiency.
Additionally, it is proposed to create four new technology values to better reflect the main photovoltaic families in use today. They provide enough granularity for data analysis while keeping tagging consistent across different solar systems.
The four proposed values are:
generator:technology=monocrystallinegenerator:technology=polycrystallinegenerator:technology=thin_filmgenerator:technology=hybrid
A monocrystalline technology is dominant in most solar installations. It is composed of single-crystal silicon cells offering the highest efficiency and durability in current photovoltaic systems.
A polycrystalline technology is still common in older or low-cost systems, but has slightly lower efficiency.
A thin_film technology has niche use in large solar farms. It is lightweight but has lower efficiency. It is comprised of lightweight modules made from amorphous silicon (a-Si), cadmium telluride (CdTe), or copper indium gallium selenide (CIGS).
A hybrid technology also know as heterojunction (HJT), combines crystalline and thin-film layers to improve efficiency and temperature performance. It is emerging as next-generation technologies.
Wave
Wave generators currently have no associated technologies. It is proposed to introduce new generator:technology=* values aligned with the two new methods proposed for wave power generation.
Technologies associated to the rebound method
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For the rebound method, three new technologies are proposed:
generator:technology=oscillating_body,generator:technology=point_absorber,generator:technology=attenuator.
An oscillating_body captures the vertical or horizontal motion of waves through a floating or hinged structure, converting this movement into hydraulic or electrical energy.
A point_absorber is a floating device that moves up and down with the waves, driving a piston or linear generator to produce electricity.
An attenuator consists of a long, jointed structure aligned with wave direction; as it flexes with wave motion, internal hydraulic pumps convert mechanical energy into power.
These technologies are unique to wave energy systems and represent the main mechanical principles used to capture and convert wave motion.
Technologies associated to the turbine method
For the turbine method, there are three technologies proposed:
generator:technology=kaplan_turbine,generator:technology=pelton_turbine,generator:technology=francis_turbine.
They operate in the same way as in hydro generators, converting the movement of water or air (driven by waves) into rotational energy for electricity generation.
In wave generators, a kaplan_turbine is suitable for low-head, high-flow systems such as overtopping devices.
A pelton_turbine can be used for high-head, low-flow installations.
A francis_turbine serve as an intermediate option for moderate head and flow conditions.
These three values already exist, so no new tags need to be created.
Generators roles
General reasoning
Many power plants include multiple generators that have different purposes. Some deliver energy directly to the grid, while others serve internal processes or intermediate conversion stages. Current tagging practices already define output and intermediate.
However, this only takes into account generators intended for the power plant process but omits other roles, like auxiliaries, standalones and backups. Opting for a similar key to transformer could simplify tagging and generalize roles even when a generator is not involved in a power plant (domestic, isolated facilities...).
It is proposed to introduce a new generator key, following the same principle as transformer, where equipment is classified by its role within the system.
Mapping and tagging the main generator of a power plant should be recommended, while mapping and tagging the internal, auxiliary, backup and standalone generators should be optional.
This ensures that tagging remains simple for general contributors, while allowing detailed documentation by expert users when the information are available.
The aim here is to make tagging more consistent without increasing complexity for typical contributors. The tag adds an optional layer of precision for users who wish to model complex energy systems.
Main generator
A main generator injects power into the public grid, acting as the plant’s external output.
This includes all wind generators, solar photovoltaic generators, tidal generators, battery-based systems. Also most reciprocating engines, combined-cycle turbines, steam turbines, and gas turbines in combustion plants.
Internal generator
An internal generator supplies energy to the plant’s own processes or to other on-site generators, without direct export to the grid. Typical examples include nuclear reactors, and intermediate equipment such as boilers, steam generators, or bioreactors used in fossil or bioenergy plants.
Auxiliary generator
An auxiliary generator converts energy for power plant own electricity need for operation. They are particularly used in case of maintenance or lack of power grid availability.
They differ from internal generators as they are usually with low capacity and not involved in the generation process of the power plant.
Some generator technologies can serve as either main or auxiliary, depending on the plant’s configuration. This applies to hydropower generators, solar thermal collectors, and systems where energy passes through multiple conversion stages before export.
Backup generator
A backup generator provides emergency or standby power during grid outages or equipment failures.
It automatically starts when the main power source fails, and thus it's role is to ensure continuity of critical operations. They are common in hospitals, data centers, and industrial sites, but may also exist within large power plants as a safety measure.
Standalone generator
A standalone generator operates independently from the public grid or any larger plant infrastructure. It supplies electricity directly to local systems, buildings, or microgrids, often in remote or off-grid locations. For example : portable diesel generators, small hydro units, and autonomous renewable systems.
~
A single power plant can include all roles of generators. In many cases, the role can be inferred from the power plant technology.
This is always the case for nuclear power plants for instance, where internal steam generators are heated by reactors, and main turbines generate electricity for the grid.
See the #Tagging section below for the full scheme and examples of configurations.
Complex example
The complex example of Stuttgart-Münster combined Heat and Power plant, Stuttgart, Germany illustrates best how main and internal generators can combine; See 26724246
26724246
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Input & output
The keys input or output are not currently used in any other mapping context.
However, both are well suited for describing industrial facilities, especially those related to energy production.
Using these two keys as complementary “mirror” tags would create a clearer and more consistent way to describe what goes into a facility and what comes out of it.
Input
As mentionned above, the current use of plant:source & generator:source creates confusion between type of energy source and the physical substance used to produce it. For example, plant:source=nuclear & plant:source=coal appear at the same level of logic, even though one refers to a field of energy and the other to a material.
To avoid this overlap, we propose introducing input, a key dedicated specifically to identifying the substances or materials required for a plant or generator to operate.
Furthermore, to reduce redundancy, some input tags would be optional when only one possible value exists for a given source. For instance:
| Power plant / generator | Only possible input (optional tagging) |
|---|---|
hydro plants |
input:water_flow=yes
|
grid plants |
input:electricity=yes
|
solar plants |
input:sun=yes
|
tidal plants |
input:tidal_flow=yes
|
waste plants |
input:waste=yes
|
wave plants |
input:water_flow=yes
|
wind plants |
input:air_flow=yes
|
That said, input: remains useful for indicating how much of a substance or material is required to produce energy.
For this purpose, we propose the use of input: to specify quantities.
This applies even to the optional cases above. For example, while it would be redundant to tag:
power=plant
|
plant:source=wind
|
input:air_flow=yes
|
It can still be helpful (though optional) to specify the amount of air flow involved:
power=plant
|
plant:source=wind
|
input:air_flow=94000 m³/s
|
output:electricity=2 MW
|
Introducing this new key gives technical users the option to add more precise data without complicating basic tagging.
Output
plant:output & generator:output have been in use since the approval of the Proposal:Generator_rationalisation in 2010 and were updated by the Proposal:Power generation refinement in 2013. This proposal builds on the logic of those earlier efforts to further simplify tagging guidelines.
To align with the proposal regarding input: above, it is proposed to remove the “plant:” and “generator:” prefixes altogether, and introduce a new output: key.
This change would make tagging shorter, and less redundant.
Previously, even though plant:output and generator:output used the same values, contributors still had to choose between two separate keys. The proposed output: removes this unnecessary distinction, allowing a single key to be used consistently for both plants and generators.
All other aspects of how this tag is used remain unchanged.
See #Input & output tagging section below for a detailed list of values and suggested units
Change management
Extensive list of affected pages
- Edit
power=plant - Edit
plant:source- Create
plant:source=bioenergy - Create
plant:source=fossil - Create
plant:source=grid
- Create
- Edit
plant:method- Create
plant:method=compression - Create
plant:method=exchange - Create
plant:method=resistive - Create
plant:method=rebound - Create
plant:method=turbineand merge the content fromplant:method=wind_turbine - Edit
plant:source=batteryintoplant:method=battery - Edit
plant:method=photovoltaicintoplant:method=photovoltaics - Merge the content from
plant:method=barrageintoplant:method=water-storage
- Create
- Edit
power=generator - Edit
generator:source- Create
generator:source=bioenergy - Create
generator:source=fossil - Create
generator:source=grid - Edit
generator:source=geothermal - Edit
generator:source=hydro - Edit
generator:source=nuclear - Edit
generator:source=solar - Edit
generator:source=tidal - Edit
generator:source=wave - Edit
generator:source=wind
- Create
- Edit
generator:method- Create
generator:method=compression - Create
generator:method=exchange - Create
generator:method=resistive - Create
generator:method=rebound - Create
generator:method=turbineand merge the contents fromgenerator:method=wind_turbine - Edit
generator:source=batteryintogenerator:method=battery - Edit
generator:method=photovoltaicintogenerator:method=photovoltaics - Merge the content from
generator:method=barrageintogenerator:method=water-storage
- Create
- Edit
generator:typepage intogenerator:technology;- Create
generator:type=attenuator - Create
generator:type=biradial-turbine - Create
generator:type=denniss-auld-turbine - Create
generator:type=hybrid - Create
generator:type=monocrystalline - Create
generator:type=polycrystalline - Create
generator:type=oscillating_body - Create
generator:type=point_absorber - Create
generator:type=thin_film - Create
generator:type=wells_turbine - Edit
generator:type=boilerintogenerator:technology=boiler - Edit
generator:type=combined_cycleintogenerator:technology=combined_cycle - Edit
generator:type=francis_turbineintogenerator:technology=francis_turbine - Edit
generator:type=heat_pumpintogenerator:technology=heat_pump - Edit
generator:type=horizontal_axisintogenerator:technology=horizontal_axis - Edit
generator:type=hydrodynamic_screwintogenerator:technology=hydrodynamic_screw - Edit
generator:type=kaplan_turbineintogenerator:technology=kaplan_turbine - Edit
generator:type=pelton_turbineintogenerator:technology=pelton_turbine - Edit
generator:type=reciprocating_engineintogenerator:technology=reciprocating_engine - Edit
generator:type=solar_thermal_collectorintogenerator:technology=solar_thermal_collector - Edit
generator:type=steam_generatorintogenerator:technology=steam_generator - Edit
generator:type=steam_turbineintogenerator:technology=steam_turbine - Edit
generator:type=vertical_axisintogenerator:technology=vertical_axis - Propose for deletion
generator:type=solar_photovoltaic_panel
- Create
- Edit
generator:planttogenerator
- Create
input:page- Create
input:air_flow - Create
input:biofuel - Create
input:diesel - Create
input:electricity - Create
input:gasoline - Create
input:hot_water - Create
input:sun - Create
input:tidal_flow - Create
input:waste - Create
input:water_flow - Edit
plant:source=biogasintoinput:biogas - Edit
plant:source=biomassintoinput:biomass - Edit
plant:source=coalintoinput:coal - Edit
plant:source=gasintoinput:gas - Edit
plant:source=oilintoinput:oil
- Create
- Create
outputpage and merge the content fromplant:outputandgenerator:output; and add proposed values and units ;