The Omaha Public Power District (OPPD) received a staff briefing Nov. 17 on the district’s upcoming 2017 Integrated Resource Plan (IRP) filing, which includes four potential portfolio options.
The IRP process will be discussed in greater detail in public meetings in Nebraska that run from Nov. 29 through Dec. 1.
The OPPD resource plan assumes a Southwest Power Pool (SPP) imposed system reserve margin of 12%; it also assumes that North Omaha power coal-fired plant will be maintained in its current state through 2018.
OPPD recently retired its 480-MW Fort Calhoun nuclear plant.
The portfolio solutions must comply with the Environmental Protection Agency (EPA) Clean Power Plan, OPPD said in its IRP assumptions.
Technology options considered include gas turbines, combined cycles, natural gas reciprocating engines, new utility grade solar, new wind power, long-duration batteries and demand side management.
OPPD developed four portfolios, which it designated by color – blue, yellow, orange and pink. Each portfolio was tested in 200 scenarios using the volatility ‘behavior’ of the market. All four scenarios include renewables as a major share of new system additions. Some of the options include battery storage or utility-scale solar.
As of October 2016, “the District has implemented approximately 12 MW of energy efficiency and 110 MW of demand response out of the 300 MW [demand side management],” OPPD said in its slide presentation.