en.wikipedia.org
"In 2018, utility scale solar power generated 66.6
terawatt-hours (TWh), 1.66% of total U.S. electricity. During the same time period total solar generation, including estimated small scale photovoltaic generation, was 96.1 TWh, 2.30% of total U.S. electricity"
Fixed orientation PV gives about 5.5 hours effective sun. Tracking, or many arrays, spreads it over 8 hours. Out of a 24 hour day.
So let's multiply 2.30% by 3x or 4x to get an estimate of what percentage of instantaneous production PV represents.
(That's ignoring how loads vary by day. I think peak is actually during time of afternoon PV production, but in some markets PV produces so much there we now see "Duck's Back" where early evening is the peak remaining for other generators if PV is subtracted.)
2.3% x 3 = 6.9%, 2.3% x 4 = 9.2% of instantaneous production coming from PV.
Rather than storage, if we could implement load control for 10% of the total load, that would be just as effective but far less capital investment, mining, manufacturing.
buildingefficiencyinitiative.org
For an office building, lighting, cooling, office machines are shown consuming 75%. there could be some opportunity to vary power draw of those. Wouldn't want to dim lights rapidly, but with power alerts scheduled days in advance could dim a bit on hot days when more A/C was needed. Electronics these days adjust power consumption according to die temperature or battery condition, so varying performance of office equipment could be considered; in some cases that wouldn't be implemented until the next roll-out of new models with the latest "Energy Star" ratings. In others, could be software updates. Microsoft and Adobe are always pushing updates to Windows 10 machines, so there's an opportunity.
Used to be when I browsed the web, it would load instantly and I could read an article. Later my PC slowed to a crawl, with status bar saying "loading this or that garbage", exhaust air gets hot and fan winds up. We wouldn't tolerate appliances that turn on the water full blast for a couple extra minutes each cycle dumping water down the drain, but that's exactly what our browsers do with electricity when loading websites that serve video advertisements and large data files.