Choose between LM2500, LM6000 and SGT-800 packages by comparing documented site output, operating behavior, condition and complete project scope. The family names are useful for shortlisting, but each contains different configurations. A defensible selection needs the offered variant's evidence and a common performance boundary before price or schedule can decide the purchase.
These families often appear in the same search because a project has identified gas-fired generation but has not fixed the unit arrangement. That is a reasonable starting point. It becomes a problem only when an OEM reference figure is treated as the output of every used machine carrying that family name.
Use SecondWatt's gas-turbine catalogue to identify candidates, then compare the actual packages against a written project requirement. This guide provides that comparison structure without declaring a universal winner.
Key Takeaways
- Identify the precise variant and package before comparing model families.
- Reconcile gross, package-net and site-net output before ranking candidates.
- Test the proposed unit arrangement against the load profile and outage case.
- Review fuel, frequency, maintenance and installation interfaces as purchase conditions.
- Shortlist documented equipment against the project requirement, then compare complete offers.
Start with the family, then identify the offered variant#
The LM2500 and LM6000 are aeroderivative turbine families. The SGT-800 is an industrial gas turbine. That architectural distinction helps organize research, but it does not establish which offered package provides the preferred project outcome.
Modern product material describes particular current configurations. A used package may have a different turbine build, generator, combustion system, control platform or enhancement arrangement. Record those differences before transferring any published figure into the evaluation.
The following table reproduces a small selection of named OEM reference outputs checked in September 2026. It deliberately retains each manufacturer's stated output boundary. It is an identification aid, not a normalized performance ranking or a statement of SecondWatt availability.
Selected OEM reference outputs and their stated boundaries#
| Family | Named reference configuration | Published simple-cycle output | Boundary to preserve |
|---|---|---|---|
| LM2500 | LM2500XPRESS+G4 DLE UPT, 50 Hz table | 34.5 MW | Net; OEM note excludes balance-of-plant equipment |
| LM2500 | LM2500XPRESS+G5 DLE UPT, 50 Hz table | 36.3 MW | Net; same published note |
| LM6000 | LM6000 PC SPRINT | 51.1 MW | Net, as labeled in the factsheet |
| LM6000 | LM6000 PF+ SPRINT | 56.9 MW | Net, as labeled in the factsheet |
| SGT-800 | 50 MW rating | 49.9 MW | Gross, ISO conditions; no intake/exhaust loss |
| SGT-800 | 62 MW rating | 62.5 MW | Gross, same published basis |
Sources are GE Vernova's LM2500 product table, its LM6000 factsheet, and Siemens Energy's SGT-800 specifications. The differing boundaries prevent a direct ranking of usable site output from this table alone.
Ask each respondent to identify the offered unit's configuration and the supporting document revision. If an upgrade is proposed, distinguish existing hardware from work still required. An available upgrade path is not evidence that the advertised unit already contains that upgrade.
Put all candidates on the same site-output basis#
Define where the project measures useful output. The generator terminals, package boundary and site's delivery point can each produce a different net figure after the relevant loads and losses are included. Give bidders the same boundary and require a schedule of included auxiliary consumption.
State the ambient design conditions, elevation or pressure basis, fuel conditions and inlet/exhaust assumptions. Request expected performance at those conditions, together with the method and evidence used to derive it. Keep reference performance, engineering estimates and contractual guarantees in separate columns.
Project performance comparison worksheet#
| Required field | Candidate response | Review purpose |
|---|---|---|
| Exact configuration | Turbine, generator and installed options | Match evidence to offered equipment |
| Site-net output | Output at the agreed delivery boundary | Compare usable capacity |
| Operating conditions | Ambient, fuel and stated losses | Identify inconsistent assumptions |
| Auxiliary loads | Equipment included inside the boundary | Prevent double counting or omission |
| Heat rate | Load points and heating-value basis | Compare fuel demand consistently |
| Evidence status | Reference, estimate, test or guarantee | Show the strength of the conclusion |
The EPA's combustion-turbine technology chapter explains why inlet conditions and operating load affect performance. Use it as technical background; its historical examples are not current offers or substitutes for a site-specific calculation.
If a candidate lacks a defensible site estimate, keep it under review rather than assigning a generic percentage derating. The missing calculation is an action for the supplier and project engineer. An invented correction can make the shortlist look complete while concealing the very uncertainty the evaluation should resolve.
Ask for the operating point that determines the capacity decision, which may differ from the point used for an annual energy estimate. A hot design day can matter for a firm-capacity requirement even when it represents few annual hours. The annual fuel comparison, meanwhile, needs the distribution of operating conditions across the dispatch profile. Keep those two analyses connected without making either stand in for the other.
Also record whether an output-enhancement arrangement depends on another service. If a proposal requires water treatment, additional electrical demand or a particular consumable, identify the service and its availability at the critical operating point. The shortlist should compare the supported package configuration, including its dependencies, rather than the enhanced output figure alone.
Match unit count to the load and outage requirement#
The right family is partly a question of how many units the project needs and how they will operate together. Write a load-duration profile and identify initial demand, later expansion, minimum operating demand and the capacity required during planned and unplanned outages.
Installed megawatts alone do not establish the required service. Review the electrical topology, common auxiliaries, fuel arrangements and control dependencies. Several units sharing one unavailable system may not provide the independence that a simple unit count suggests.
Illustrative capacity screen for a hypothetical 60 MW requirement#
| Assumed arrangement | Assumed site-net capacity per unit | Installed capacity | Capacity with one unit unavailable |
|---|---|---|---|
| Three smaller units | 30 MW | 90 MW | 60 MW |
| Two larger units | 50 MW | 100 MW | 50 MW |
These are hypothetical unit capacities, not ratings assigned to LM2500, LM6000 or SGT-800 equipment. The arithmetic shows why a larger installed total can still fail a specified single-unit-out capacity screen. It does not establish the availability or electrical performance of either arrangement.
Next test how the units would be dispatched at each load stage. Determine which machines run, their individual loading and the reserve or storage arrangement during a start or trip. Request transient behavior for the actual package and control configuration; a reference start time does not prove that the plant will accept the site's required load sequence.
Future expansion should also have a defined boundary. Ask whether additional units require another gas connection, switchgear section, transformer or control modification. The first phase should not be selected on an assumed expansion path that the site layout or equipment interfaces cannot support.
Review fuel, frequency and cycle configuration#
Fuel compatibility is a package question. Obtain the actual site gas analysis and delivery conditions, then have the supplier confirm suitability for the installed combustion arrangement. Separate the fuel commodity, transportation and connection arrangements from the turbine purchase.
The gas-turbine fuel-requirements guide provides the detailed enquiry fields. For the family comparison, record the required treatment or compression equipment, its scope owner and its effect on site-net output and schedule.
Electrical compatibility deserves the same discipline. Confirm generator frequency, voltage, speed relationships, excitation, protection and intended operating arrangement. Use the frequency-compatibility guide when a candidate differs from the receiving system. A family offered in both frequencies does not establish that a particular used package can change frequency without modification.
Interfaces that can change the shortlist#
| Interface | Evidence needed before selection |
|---|---|
| Gas supply | Composition, pressure, flow and operating-condition confirmation |
| Combustion | Installed arrangement and documented operating envelope |
| Electrical | Generator and package compatibility with the receiving system |
| Emissions equipment | Required controls, included hardware and project review |
| Heat recovery | Actual thermal use, added equipment and plant boundary |
| Water and auxiliaries | Required services at the intended operating conditions |
Keep simple-cycle and combined-cycle proposals in distinct scope columns. A steam cycle introduces equipment and operating interfaces beyond the gas turbine. The simple-cycle versus combined-cycle guide explains that decision in more detail.
For an industrial site that can use recovered heat, request a matched heat-demand profile. Unused thermal output is not a purchased benefit merely because a brochure reports a combined heat-and-power efficiency. The project must establish a useful heat sink and the equipment needed to connect it.
Compare condition and maintenance obligations#
A family-level comparison cannot establish the remaining service potential of a specific used machine. Request the unit's operating and maintenance records, component history, inspections and storage evidence. Identify the service assumptions underlying the proposed next maintenance interval.
Use the remaining-life and overhaul guide to organize that review. For this shortlist, translate the findings into required work, estimated outage exposure, evidence gaps and the commercial party responsible for each action.
Do not rank the families by a published reliability percentage. Such figures may use different fleets, periods and definitions, and they do not describe the condition of the offered units. Ask instead how the project will obtain parts, specialist service and a practical repair or exchange path for its selected configuration.
Maintenance and condition questions for each candidate#
| Topic | Question to resolve |
|---|---|
| Operating history | Which hours, starts and events are documented? |
| Components | Which major parts were changed, repaired or upgraded? |
| Inspection | What was examined, when and by whom? |
| Storage | How was the equipment preserved and monitored? |
| Next work | What intervention is required before and after installation? |
| Support | Which service organization and parts path are available contractually? |
| Acceptance | What evidence closes the outstanding condition questions? |
The preferred maintenance arrangement depends on the project. An owner with an established service team may evaluate a package differently from an owner requiring a third-party service agreement. Put that operating model into the enquiry so the shortlist reflects the support the buyer can actually secure.
Keep promised work separate from completed work. A supplier's proposed overhaul can be a valid part of an offer, but the schedule, scope, inspection hold points and acceptance evidence must remain visible. It should not be entered in the comparison as an already completed condition improvement.
Compare complete offers and credible schedules#
Normalize the commercial scope after the technical screen. Include the generator package, controls, auxiliaries, missing systems, identified condition work, removal, transport and receiving-site responsibilities. Record exclusions and unresolved allowances beside the total.
For logistics, use a named delivery point and a defined allocation of responsibilities. The ICC's Incoterms 2020 guidance provides the framework for delivery-related terms. The equipment agreement still needs its own provisions for condition, acceptance, ownership and remedies.
Separate equipment release, shipment, site delivery and operating acceptance in the schedule. Ask what starts each quoted duration and which prerequisites remain with the buyer. A package available for inspection is not necessarily released for immediate shipment, and shipment does not resolve the receiving site's dependencies.
Where the purchase includes a performance commitment, agree the test basis before award. ASME's public PTC 22 scope describes corrected turbine performance testing. The project must still define its contractual boundary, conditions, uncertainty treatment and acceptance values with qualified reviewers.
Compare the LM2500 dossier, LM6000 dossier and SGT-800 dossier alongside the actual offers. The dossier provides family context; the offer and its supporting evidence identify the candidate being considered.
Build a shortlist with explicit decision gates#
Use a short decision matrix instead of an overall score that hides disqualifying gaps. A candidate should not compensate for an unresolved frequency incompatibility by receiving more points for a lower equipment price.
Practical shortlist decision matrix#
| Gate | Evidence required | Possible decision |
|---|---|---|
| Capacity and duty | Site-performance and operating review | Retain, request clarification or exclude |
| Interfaces | Fuel, electrical and site compatibility | Accept or define corrective scope |
| Condition | Records and agreed inspection findings | Accept, repair, investigate or exclude |
| Support | Documented service and parts arrangement | Confirm or obtain an alternative |
| Commercial scope | Comparable inclusions, exclusions and terms | Normalize and negotiate |
| Schedule | Milestones with identified dependencies | Confirm fit or revise programme |
Record why the final candidates remain viable and what evidence could change that conclusion. This helps the team respond when a package is withdrawn or an inspection reveals additional work. The requirement stays stable even when individual offers change.
Give unresolved questions an owner and a decision date. If a supplier cannot provide a condition record, site estimate or compatibility confirmation in time, the team can then choose an inspection, an alternate candidate or a revised programme. That is more useful than allowing the same undocumented assumption to pass through successive versions of the shortlist.
SecondWatt acts as an independent intermediary. To request a turbine shortlist, provide the site's net power requirement, load profile, frequency, fuel conditions, region and delivery constraints. Identify accepted alternatives so sourcing can evaluate documented fit across the families rather than assuming that the first model named is mandatory.
Build a project shortlist with our guide to gas turbines for a 100 MW data center, including load boundaries and surviving capacity.
If the turbine family is still open, begin with the aeroderivative vs industrial gas turbine guide before comparing individual packages.
FAQ: LM2500, LM6000 and SGT-800 selection#
Which of these turbine families is best?#
The answer depends on the project requirement and the actual packages offered. Compare site-net output, unit arrangement, operating profile, interfaces, condition and support before commercial terms. A family-level preference can guide the search, but it should not replace the evidence needed to accept a particular used unit.
Can I compare the brochure megawatt figures directly?#
Only after confirming equivalent boundaries and conditions. The selected OEM references in this article include both net and gross figures. They are presented with those labels to prevent an unsupported ranking. Request a common site-output calculation for the actual configurations before using the figures in a capacity or price-per-kilowatt comparison.
Does a current OEM specification apply to an older unit?#
Not automatically. Identify the unit's variant, installed systems and modification history, then obtain the corresponding technical evidence. A current product page may describe enhancements that the used unit does not contain. Proposed upgrades should have their own scope, price, schedule and acceptance evidence before they enter the comparison.
Is the arrangement with more installed megawatts more resilient?#
Not necessarily. Review the required capacity during the defined outage case and examine shared dependencies. The illustrative arithmetic above shows that installed capacity and capacity with one unit unavailable can point in different directions. A full reliability and electrical review also needs the topology, controls, auxiliaries and operating strategy.
Should maintenance intervals determine the family choice?#
They are one input, provided they apply to the actual equipment and operating case. Review component history, duty, service requirements and the support arrangement alongside the interval. A nominal family interval does not establish when a used unit needs work or how long the project's particular maintenance outage will last.
What should the first sourcing enquiry include?#
Send the required site-net capacity, load profile, frequency, available gas conditions, location and target milestones. Add the accepted equipment condition and project scope. If LM2500, LM6000 and SGT-800 are all acceptable, say so and invite documented alternatives against the same requirement so the resulting offers can be compared consistently.