  The high electricity consumption of cryptocurrencies that rely on
proof-of-work (PoW) consensus algorithms has raised serious environmental
concerns due to its association with carbon emissions and strain on energy
grids. There has been significant research into estimating the electricity
consumption of PoW-based cryptocurrencies and developing alternatives to PoW.
  In this article, we introduce refined models to estimate the electricity
consumption of two prominent alternatives: Ethereum, now utilizing
proof-of-stake (PoS), and Filecoin, which employs proof-of-spacetime (PoSt).
Ethereum stands as a leading blockchain platform for crafting decentralized
applications, whereas Filecoin is recognized as the world's foremost
decentralized data storage network.
  Prior studies for modeling electricity consumption have been criticized for
methodological flaws and shortcomings, low-quality data, and unvalidated
assumptions. We improve on this in several ways: we obtain more novel,
validated data from the systems in question, extract information from existing
data and research, and we improve transparency and reproducibility by clearly
explaining and documenting the used methodology and explicitly stating
unavoidable limitations and assumptions made. When comparing the current, most
prominent models for Ethereum and Filecoin to our refined models, we find that
given the wide error margins of both the refined models and the ones introduced
in prior literature, the resulting average estimates are to a large extent in
line with each other.
