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MISO Solar Capacity Credit calculation comes out in November 2020

Rao Konidena's picture
Independent Consultant Rakon Energy LLC

Rao Konidena found Rakon Energy LLC because Rao is passionate about connecting clients to cost-effective solutions in energy consulting, storage, distributed energy resources, and electricity...

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  • Oct 2, 2020

MISO is calculating capacity credit for solar for the first time starting 2021/22 planning year (June 21 - May 22). Until now, MISO assigned 50% capacity credit for solar without any calculation. As stakeholders are aware, MISO calculates wind capacity credit annually.

The management plan for MISO Resource Adequacy SubCommittee (RASC), the stakeholder entity where resource adequacy matters are discussed reflects solar and wind capacity credit on Nov RASC meeting agenda.

It remains to be seen if the calculated value for solar capacity credit is lower than 50% as one might expect. Transmission connected solar at MISO is less than 1,000 MW. See slide 70 here.

But MISO is expected to reach 10,000 MW of utility scale solar by the end of 2021, according to MISO's Dispatchable Intermittent Resource filing at FERC. Docket #ER20-595.

Plus MISO has more than 35 GW in the interconnection queue.

Hence this solar capacity credit calculation is critical for determining the capacity value of solar in meeting planning reserve margin requirements.


Matt Chester's picture
Matt Chester on Oct 2, 2020

It remains to be seen if the calculated value for solar capacity credit is lower than 50% as one might expect.

What's the timeframe on when the full information will be known/evident? 

Rao Konidena's picture
Rao Konidena on Oct 4, 2020

Hi Matt - I would expect more information and full information on the solar and wind capacity credit at MISO is available in the first week of December 2020. This is the typical time frame because MISO Load Serving Entities start making plans to procure resources and tag them in the MISO's Module E Capacity Tracking Tool in December.

As you know the Planning Resource Auction window closes in April. The results of this auction are announced in May 2021.

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