Search results for: “power electronics”
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Combined heat and power: the economics?
This data-file models the energy economics of a combined heat and power installation, to provide electricity and heating behind the meter, in lieu of purchasing electricity from the grid. Economics are strong, especially for larger units. CO2 emissions can also be reduced by 5-30% due to high efficiency.
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Hydro electric power: the economics?
A typical hydro project requires a 10c/kWh power price and a $50/ton CO2 price to generate an unlevered IRR of 10%. 80% of the cost is capex. Hence at a 6% hurdle rate, the incentive price falls to 6c/kWh. Cash opex is 2c/kWh. CO2 intensity is effectively nil, even after reflecting the construction energy.
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Power grids: hell is a hot, still summer’s day?
Ramping renewables to 50% of power grids is a growing aspiration in the energy transition. But in some markets, it may result in devastating blackouts during summer heatwaves, as power demand doubles exactly when wind, solar, gas, transmission losses and disruptions all deteriorate. This 15-page note assesses the implications.
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Power grids: tenet?
How do power grids work? How will they be re-shaped by renewables? This 20-page note outlines the underpinnings of electricity markets, from theoretical physics through to looming shortages of inertia and reactive power. There are challenges back-stopping renewables and this creates opportunities.
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Power plants: cold starts and ramp rates?
This data-file aggregates the ramp-up rates of power generation sources, as they start up from “cold”, and then as they ramp up (in MW per minute). Hydro and simple cycle gas turbines are fastest, followed by CCGTS, coal and nuclear.
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Capacitor banks: raising power factors?
Power factor corrections could save 0.5% of global electricity, with $20/ton CO2 abatement costs in normal times, and 30% pure IRRs during energy shortages. They will also be needed to integrate more new energies into power grids. This note outlines the opportunity in capacitor banks, their economics and leading companies.
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Wind power: operating costs?
Opex for a wind power project is typically $40/kW-year, or around 1-2c/kWh. Around $25/kW is maintenance, suggesting the wind maintenance market is now worth >$20bn per year. The best route to lower cost is up-scaling turbines and wind assets.
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Power transmission: inter-connectors smooth solar volatility?
Can large-scale power transmission smooth renewables’ volatility? To answer this question, this horrible 18MB data-file aggregates 20-years of hour-by-hour solar insolation arriving at four cities in the US. The volatility in year-by-year can be halved by a single inter-connector.
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Gas turbines: operating parameters?
A typical simple-cycle gas turbine is sized at 200MW, and achieves 38% efficiency, as super-heated gases at 1,250ºC temperature and 100-bar pressure expand and drive a turbine. Efficiency rises to 58% in a combined cycle. The purpose of this data-file is to tabulate typical operating parameters of gas turbines.
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California electricity prices by hour?
In 2023, power grids with c20-30% solar variation tend to have intra-day spreads of 9c/kWh, between peak wholesale electricity prices at 8pm and trough prices at 10am. Unusually, night-time electricity prices are 40% higher than day-time prices. This data-file quantifies California electricity prices, on a wholesale basis, at a sample of grid nodes, looking hour…
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