The next in line would be central banks and government bonds doing the quantitative easing, aka printing money, and delivering that money not to the private banks, but to the power consumers. This wouldn't lower power prices, however. Based on past actions of central bankers, this is the opposite of what they'd do (i.e. they'd demand IMF-style austerity programs in exchange for funding regional governments).
Increasing shipments of fossil fuels to Europe from non-Russian sources as a means of reducing power costs is implausible, as global supplies aren't there - but I do notice that each LNG tanker being sent from the USA to Europe is immensely profitable for the suppliers, so maybe the plan is working out as intended? Fossil fuel profits on Wall Street have hit records lately, even surpassing those of the arms manufacturers supplying the ongoing war in Ukraine.
Europe's in a very poor position between the USA and Russia, the former wanting to continue the war indefinitely (and to maintain sanctions) and the latter clearly pushing for a permanent division of Ukraine. Some people saw how all this would play out six months ago, however, here's there Jan 2022 prognosis:
https://www.vortexa.com/insights/products/reality-check-on-r...
Outcome: This would rather sanction the importers than Russia, as importers would have to scramble for alternative supplies, while Russia would find alternative buyers elsewhere. Potential hiccups in this rearrangement would put more harm on Europe, with consumers immediately feeling any price increase and delay in supplies...