Record-breaking solar generation defined Summer 2025, with GB output reaching 13.8 TWh but capture rates falling to around 85% of baseload prices. David and Dan Wilkinson discuss what this means for PPA valuation, shaping costs, and the balance between fixed and indexed contracts. They unpack why price cannibalisation is accelerating, how wind and solar trends compare, and how co-located batteries and behind-the-meter generation can protect value. The episode also previews EDF’s new monthly capture-price reporting, giving offtakers and developers faster insight into renewable market shifts.

PowerCast: September Power Market Recap - volatility, wind, BM shifts

Monthly market update from EDF Wholesale Market Services. Rachel is joined by analysts Robbie Auld and Bhanu Duggal to unpack September’s UK power markets: stronger wind, deeper day-ahead dips, and what it meant for batteries.

What we cover

Prices and volatility: lower averages on strong wind, deeper negative periods, and wider wholesale spreads for batteries.

BM activity: record daily battery offers, regional patterns, and interconnector outages shaping dispatch.

Rule changes: how the ABSVD treatment shift and non-BMU access to Quick Reserve from 3 September change strategies.

Ancillary services: knock-on effects across DR, DC, and DM as competition and pricing rebalance.

Battery revenues: highlights from our Battery League tables and where value showed up.

Winter outlook: NESO’s latest view on margins and what a windy winter could mean for spreads.

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