Greenbyte Documentation

Production-Based Availability

Production-based availability is calculated as

Equation 2. 
Ap=(1-ElEa+El)x100 A_p=\left(1-\frac{E_l}{E_a+E_l}\right)x100


where:

Ap is the availability

El is lost production

Ea is actual production

Lost production is calculated as

Equation 3. 
El=Ep-Ea E_l=E_p-E_a


where where Ep is the potential production.

Lost production is only calculated when the device is unavailable or operating in the category Partial Performance. Since most turbines don’t indicate when they are in partial performance, Greenbyte does not include that part of the specification in the calculation. See Lost Production for details on how lost production is calculated.

Greenbyte uses several different production-based availability calculations.

Production-Based Contractual Availability

Production-Based System Availability

Production-Based System Availability (Virtual)

Production-Based System Operational Availability (IEC B.2.2 User’s View)

Production-Based Turbine Operational Availability (IEC B.2.3 User’s View)

Production-Based Technical Availability (IEC B.3.2 Manufacturer’s View)

The difference between them is the categories that are considered available. The IEC availabilities are based on the standard IEC 61400-26-2 and use the information model described there.

Production-Based System Operational Availability (IEC B.2.2 User's View)

System operational availability represents the user’s view of availability and is the ratio of actual production compared to what the production would have been if the turbine had been generating at full performance. All causes of lost production are included.

Categories with actual production (lost production of 0 is assumed) :

  • Full performance

Categories with actual production and lost production:

  • Partial performance

Categories with lost production (actual production of 0 is assumed): 

  • Technical Standby

  • Out of Environmental Specification

  • Requested Shutdown

  • Out of Electrical Specification

  • Scheduled Maintenance

  • Planned Corrective Action

  • Forced Outage

  • Suspended

  • Force Majeure

Categories not considered:

  • Information not available

Production-Based Technical Availability (IEC B.3.2 Manufacturer's View)

Technical availability represents the turbine manufacturer’s view of availability and is the ratio of actual production compared to what the production would have been if the turbine had been generating according to its design specification.

Categories with actual production (lost production of 0 is assumed):

  • Full performance

  • Technical Standby

  • Out of Environmental Specification

  • Requested Shutdown

  • Out of Electrical Specification

Categories with actual production and lost production:

  • Partial performance

Categories with lost production (actual production of 0 is assumed):

  • Planned Corrective Action

  • Forced Outage

Categories not considered:

  • Scheduled Maintenance

  • Suspended

  • Force Majeure

  • Information not available

Production-Based Turbine Operational Availability (IEC B.2.3 User's View)

Turbine operational availability represents the user’s view of availability but differs from operational availability in that categories usually beyond the control of the turbine are excluded from consideration. Time when the operator has requested a shutdown, an electrical connection is not available, or a force majeure event has occurred are excluded from the calculation.

Categories with actual production (lost production of 0 is assumed):

  • Full performance

Categories with actual production and lost production:

  • Partial performance

Categories with lost production (actual production of 0 is assumed):

  • Technical Standby

  • Out of Environmental Specification – Other

  • Scheduled Maintenance

  • Planned Corrective Action

  • Forced Outage

  • Suspended

Categories not considered:

  • Out of Environmental Specification – Calm

  • Requested Shutdown

  • Out of Electrical Specification

  • Force Majeure

  • Information not available