Class 10: Battery Integration

What is most likely cause of BESS thermal events?

Based on the controls and systems not the cell itself (Ex. Moss Landing Fire)

Why do BESS fail during the earlier years of the battery’s operation?

Controls weren’t fully tested and integrated earlier in time leading to these early failures.

Interconnection Agreement

Off-Take Agreement + Power Purchase Agreement

Someone who agrees to buy your energy

Merchant Market

Some project managers do not want to take merchant risk.

Nose to Proceed (NTP)

Integrator vs. Manufactuer

Manufactuer’s engineer and construct the battery system

Integrator: install equipment hardware stack (e.g. AC-block or DC-block), control + analytics systems, lifecycle services (remote monitoring, preventative and corrective maintenance)

• Middle man for OEM and customer

When do I need to buy the equipment?

HV Equipment: 2-4 years (equipment lead times)

Inverters: 9-12 months

Batteries: 4-8 Months

High voltage equipment should come before the battery and inverters

FlexGen Fab 5

1). Interconnection Executed

2). Offtake secured

3). Financing secured

4).

5). Equipment ordered

Hardware-Agnostic System Integrator

Vertically-Integrated System Integrator

Liquidated Damages

What is the finacial payment your going to make for not meeting an obligation

• Did you deliver the equipment on time?

• Did you meet the milestones?

• Performance (e.g. round trip efficiency, lifespan, energy capacity)

How do you allocate the risk?

FlexGen contract; it’s about managing the contract and considering the procurement

Energy Managment System Structure

Battery degrade between the time of it is manufactured and when it is installed in COD

So was 254 AC usable energy @ POI but then by COD it is 217

Concern with Datacenters

Not energy supply but the capcity issue at peak demand (because the demand curve grows and gets close to utilities maximum capcity line which is concerning in terms of emergency scenarios)

Datacenters are looking for sustaianble backup generation so looking to battery