Electricity is more expensive than natural gas per unit energy, but heat pumps are much more efficient than gas furnaces and water heaters. Today that is about a wash, somewhat cheaper in many buildings and more expensive in some others. [2/7]https://www.ethree.com/e3-quantifies-the-consumer-and-emissions-impacts-of-electrifying-california-homes/ …
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That changes if you consider carbon-free options. CA electric heat pumps are on track to be nearly carbon-free, powered largely by renewables. But the supply of inexpensive renewable biogas is quite limited and subject to competing demands such as transportation biofuels. [3/7]pic.twitter.com/5ZCpYknvjb
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After biogas is exhausted, you can turn to electrolytic fuels derived from renewables. Hydrogen could get a lot cheaper but only 5-7% can be blended (by % energy) in the existing gas distribution system without extensive retrofits. Next up is synthetic NG. [4/7]
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There may be some extra CO2 you can reuse from biorefining for SNG, but after that you have to use DAC to pull CO2 out of the atmosphere. All in, it would take up to 10 times more renewable energy to make the gas and burn it than powering a heat pump-- at great expense. [5/7]pic.twitter.com/zIbcxjxUM4
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Any serious push towards decarbonizing buildings with RNG would cause gas bills to soar as expensive substitute methane replaces cheap fossil gas. Many customers would likely electrify anyway, leaving fewer to pay fixed costs and further increasing rates ("death spiral"). [6/7]
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This is why we see the need for a gas transition strategy that likely starts by limiting expansion of the system. This message has been picked up by
@GridworksOrg and environmental orgs like@NRDCEnergy,@SierraClub,@Greenlining, &@buildingdecarb. [7/7]https://gridworks.org/initiatives/cagas-system-transition/ …Prikaži ovu nit -
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One addendum: there are additional challenges for
#electrification to provide peak heat in cold climates unlike CA. Many solutions are possible, including efficiency or hybrid approaches with gas or liquid backup. However, electrifying most heating energy is still the way to go.Prikaži ovu nit
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I’ll let
@oxpo18 speak to PNW and note a few advancements of this study: —Closer look at RNG tech. —Analysis of gas delivery and customer bills. —Analysis focused on 80 x 50, but starting to look to carbon neutrality —> can’t rely on other sectors to make up GHG gap in bldgs. - Još 2 druga odgovora
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