When I read the comment about energy storage, I was thinking for longer term backup power of greater than 60 seconds of runtime. You are correct, that it takes

When I read the comment about energy storage, I was thinking for longer term backup power of greater than 60 seconds of runtime. You are correct, that it takes some time, usually about 10 seconds for a diesel generator to come online and provide the power. That power gap is traditionally provided by a UPS (which can be chemical (battery), kinetic (flywheel), or some other short term power supply). Again, my interest is diesel alternatives that are being developed and deployed in large scale datacenters. I used to work at a datacenter that had all the usual elements. ATS, UPS, Caterpillar genset. It's all quite interesting.