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  "documentTitle": "NW Natural Holdings | Investor Conference Presentation Deck | 52 slides",
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  "presentationDate": "2021-06-01 00:00:00",
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  "notes": "The slide uses a bar chart to contrast natural gas storage capacity against hydro and battery output, emphasizing the cost-effectiveness of gas infrastructure for energy storage.",
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      "text": "2019 U.S. Energy Output by Facility Type (MWh)",
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      "text": "Gas system has 2.5 times the energy of hydro facilities and about 1,500 times the energy delivered from current large-scale utility batteries. Existing facilities can be used to store renewable natural gas and methanated hydrogen. NWN’s Mist storage can hold 6 million MWh of energy that can be delivered whenever needed. To replicate that with a Lithium-ion battery, that’s $2 trillion at today’s prices",
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      "text": "Source: EIA Weekly Natural Gas Storage Report... https://www.nrel.gov/docs/fy19osti/73222.pdf",
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      "text": "GAS SYSTEM: FLEXIBLE RENEWABLE STORAGE",
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