BESS projects often on brownfield/” questionable” land so insurers want to check land stability etc.

Check for appropriate flood mitigation measures

Check distances between BESS units and from substation. To calculate probable maximum loss

Check foundations levels against flood return periods.

For proximity to BESS units and possible thermal runaway cascade

For contingent DSU/BI coverage

For contingent business interruption

Check schedule against weather seasons and check if the build schedule is conservative/aggressive

O&M responsibilities covering BESS, BOP and electrical infrastructure.

e.g. the Electrical diagram

Normally from a DNV or equivalent for the project and/or technology used

This should include details on deflag vents, gas detection, BMS scope.

Any tech due diligence?

What are the warranty provisions and how these are financed.

Some details on # of MWhs produced etc.

Does it have locally based technical personnel? How involved is it during commissioning?

BESS, inverters, PCS, main power transformer

Check to see if there are multiple transformers, in the event of damage to one can the other operate independently? If so, how much of the project could still export?

If any grid upgrade works beyond the site boundary needs insurance cover then we need full details of what is being built and at what cost.

This normally has plenty of information that helps answer a lot of insurer questions.

If Delay in Start-up required.

How will the project make money: capacity payments/ancillary services/arbitrage etc.

Insurers needs to see the relative cost of different bits of equipment.

• How many major contracts?
• Who are the major contractors?
• EPC/multi-contracting

How many contracts/work packages? Is it an EPC / multi-contracting approach?

Some communication (letter/email) that the local fire brigade is aware of the BESS project

• Water suppression
• Gas suppression
• Liquid cooling
• Other

Mitigation strategies such as any water suppression (if applicable) etc.