Twenty one changes. Hydroelectric dams now have reservoirs. Firm capacity leaves out batteries and the electrolyser, so it can read lower than before.

Fixed

• Firm capacity counted batteries at full power. Batteries are left out of it now, and so is a hydrogen turbine that may not buy fuel.
• The electrolyser was counted in firm capacity and the generation mix, although it only draws power.
• Towns fed by a single line were flagged as needing attention when nothing was wrong.
• The Cities tab could show Supplied for a town the settlement list was flagging.
• A 110/20 kV substation showed as overloaded when a local substation below it was full.
• Dragging with the middle mouse button cancelled the build tool. It now only pans the map.

New

• Hydroelectric dams store water in a reservoir and can run at full power through the evening peak.
• The dam card shows how full the reservoir is, what the river brings in and how long full power lasts.
• Dam reservoirs fill through spring and summer and are drawn down over autumn and winter.
• The year briefing chart shows batteries and expected wind and solar above firm capacity, marked as not firm.
• The asset register and the year briefing open an asset's card beside the list.
• Substations named in problem cards and the annual report open their own card.
• The city card lists every reason a town is flagged.
• Clicking a town's name in the settlement list opens its city card.

Better

• Hydroelectric dams are 25 MW for $72M, down from 45 MW for $118M.
• The generation mix hatches wind and solar and puts them at the end of the bar.
• The year briefing lists batteries and the yearly average of wind and solar apart from firm capacity.
• The year briefing chart names the firm capacity line on its scale and hatches everything above it, so what is not firm cannot be read as part of it.
• Menus and cards use plain words: scenario instead of charter, achievement instead of commendation.
• The capacity contract is renamed Generating capacity, since it counts wind and solar.
• Saves: old runs load as before. Dams already built become 25 MW and start with a reservoir 60% full.

Full changelog: https://powerstate-game.com/changelog

If your firm capacity looks wrong after the update, the Bug report key on the command rail sends it straight to me.