There has been a great deal of activity in the renewable energy sector over the last couple of years, specifically in Wind, Solar, Biomass, Tidal and most recently a resurgance in Geothermal. The question is what is the viability of renewable energy, is it the solution to our energy crisis and most importantly will the power utilities embrace the technology?
The challenge of renewable energy has been one of technology and economics. Developing technologies that allow us to harness the energy and convert it into electricity. And most importantly (to the utility) doing this at a cost that’s at least equal to or lower than the cost of generating electricity from non-renewable sources.
More than half the states in the U.S. require utilities to get a percentage of their electricity from renewable sources by certain target dates.
Utility scale renewable power generation is developing into one of the hottest energy market segments. The Prometheus Institute reports that worldwide more than $30 billion in investment has been proposed for solar plants to be constructed in the next several years and that up to $200 billion in new investment may be needed through 2020 and this is for solar power.
While the evolving renewable energy industry clearly presents enormous opportunities, attracting the massive level of capital is a major challenge. The industrial sector, financial community, and utilities have a long way to go to develop a common understanding on how these projects will be financed. A much deeper understanding is needed for utility scale projects, their risks, risk mitigation, management techniques, and the requisites that will make these projects cost effective. Communication among all parties will be critical to the success of renewable energy (at the utility level). The federal government has stepped in with tax incentive programs to promote renewable development. State and local governments have also implemented incentive programs to encourage renewable energy at the utility level as well as residential and commercial.
Will renewable energy play a role in our future? Yes. Is it the ultimate solution to our electric power energy crisis? No. For a rational, fact based explanation lets review the advantages and disadvantages of the major renewable technologies.
First a overview of current technology on a operating cost (O&M, Fuel) per kWh basis:
- Nuclear – 2.0 cents/kWh
- Fossil Steam – 3.5 cents/kWh
- Hydro – 1.0 cents/kWh
- Other Fossil – 5.5 cents/kWh
Capital cost for conventional power: NOTE – construction cost fluctuate with raw material prices and labor cost
- Nuclear – $5,000/kW (best guess)
- Conventional Coal – $2,500/kW
- Hydro – $800/kW
- Other Fossil – $1,200/kW
Capital cost for renewable energy
- Wind – $1,208/kW
- Biomass – $2,500/kW
- Geothermal – $3,000/kW
- Tidal -
- Solar
- Photovoltaic – $4,000/kW
- Thermal – $2,000/kW
Besides capital cost renewable energy has other limitations:
- Capacity, the average wind turbine produces 2MW, the worlds largest solar plant produces 154MW of DC power
- Distribution, with the exception of hydro electric, biomass and geothermal renewable has limited availability
- Limited ROI (return on investment), huge investment with require many years to turn profit, wind, tidal, solar, geothermal have estimated 20 year life
- Transmission, requires additional transmission lines (1.5M per mile)
There are policies and governmental initiatives to promote investment in transmission to support renewable energy.
A significant number of renewable energy generation technologies have reported significant increases in cost due to increases in global raw material costs
Solar thermal generation and solar photovoltaic technology options remain the most expensive.
Renewables have a prominent place in the electric utilities’ plans. But most renewable energy is not available 24/7. Some energy source must be available to keep the lights on.