Alberta Electric System Operator


Alberta Electric System Operator
Key people
Michael Law - President & CEO[1]

The Alberta Electric System Operator, (AESO), is a not-for-profit entity responsible for the planning[2] and operation of the Alberta Interconnected Electric System (AIES) in a "safe, reliable, and economical"[3] manner. It is mandated by provincial legislation to act in the public interest and cannot own any transmission, distribution or generation assets.

The key duties and responsibilities of the AESO are dictated by the Province of Alberta's Electric Utilities Act (EUA) and the Transmission Regulation (T-Reg) and include, without limitation, the following:

  • Determine the future requirements of the AIES, develop transmission plans over near-term, medium-term and long-term planning horizons that identify transmission system enhancements needed to meet those requirements, and make arrangements to implement those enhancements as necessary.
  • Prepare and maintain a transmission system that anticipates, for at least 20 years forward, system conditions and requirements. The system must be planned to accommodate future growth, which requires the AESO to take a long-term view while adjusting for short-term changes and focusing on system requirements that meet the long-term vision for electrical infrastructure.
  • Ensure the safe, reliable and economic operation of the AIES.
  • Operate the power pool and facilitate the electricity market in a manner that is fair, efficient and openly competitive.
  • Provide transmission access service consistent with an approved transmission tariff.
  • Manage and recover the costs associated with line losses and ancillary services.
  • Conduct a fair and open competitive process to determine the successful proponent who will develop, design, build, finance, own, operate, and maintain identified major transmission infrastructure in Alberta.

The AESO operates a market for the exchange of electric energy in Alberta and attempts to uphold the principles of market fairness, openness, and efficiency. To this end the AESO "contracts with transmission facility owners to provide generators access to the electric grid."[3]

One of AESO's responsibilities is to manage system load in the case where shortfalls in supply or excessive demand for electricity threaten the integrity of the power grid. In this case AESO can direct power companies to shed load temporarily through measures such as rolling blackouts. In July 2012, six power generators were shut down during a major heat wave that resulted in high demand on the power grid, Edmonton, Calgary, Red Deer and Lethbridge were hit by rolling blackouts.[4] AESO directed utilities to reduce their customer load. AESO's Doug Simpson explained that this had not happened since 2006.[4]

According to their homepage, AESO operates "independently of any industry affiliations and owns no transmission or market assets."[3]


Alberta electricity policy changed in 1996, with the province restructuring its electricity market away from traditional regulation to a market-based system. The market now includes a host of buyers and sellers, and an increasingly diverse infrastructure.

Expanding wind farms

In 2006 Alberta Electric System Operator explained the limitations of dependence on wind power. AESO at that time could not "rely on any more than 900 megawatts of wind (less than eight per cent of the province's total power generation) because wind doesn't blow consistently. When it drops off, coal and natural gas plants have to take up the slack to avoid power shortages." At that time Alberta didn't have "enough transmission lines to connect new wind turbines to its power grid."[5]

High cost of electricity in Alberta

In April 2013, Calgary ranked third (with an average monthly payment of $216[6] based on a monthly consumption of 1,000 kWh) and Edmonton fourth ($202 a month) in Canada compared to other cities in terms of high electricity bills. Halifax placed first and worst in Canada at $225[6] a month. Compared to other cities in North America, Calgary and Edmonton placed seventh and eighth in terms of highest power costs.[7]

The unit price of electricity in Calgary in April 2013 was 14.81 cents per kWh, compared to 6.87 cents per kWh in Montreal, 15.45 in Halifax.[8]

According to a 2013 Edmonton Journal article, Keith Provost, former senior vice-president of Alberta Power Ltd. (now ATCO Electric), with decades of experience in the electrical utilities business, said that instead of marketing electricity contracts for future deliveries in a regulated market, AESO has their own system that is open to manipulation and is not a free-market system. According to AESO, "The pool price is the arithmetic average of the 60 one-minute system marginal prices. Only those offers accepted generate power and receive the AESO pool price. All offers accepted receive the same price, the pool price, not the price offered."[9]

See also



  • "About AESO", Alberta Electric System Operator, nd, retrieved 22 December 2013
  • "Profile David Erickson" (PDF), AESO, August 2009, archived from the original (PDF) on 2012-02-27, retrieved 22 December 2013
  • "Alberta's power lines too full for expanding wind farms", CBC News, Calgary, Alberta, 20 October 2006, retrieved 22 December 2013
  • Liebrecht, Richard (22 September 2009), Residents want west-end transmission line buried, Sun Media, retrieved 22 December 2013
  • "Alberta hit by rolling power blackouts: 'Great concern' grid would go down, Calgary mayor says", CBC News, Edmonton, Alberta, 9 July 2012, retrieved 22 December 2013
  • "Comparison of Electricity Prices in major North American Cities: Rates in effect April 1, 2013" (PDF), Hydro Quebec, 2013, archived from the original (PDF) on 19 December 2013, retrieved 22 December 2013
  • Provost, Keith (21 December 2013), "Opinion: Unplugging myths about our electricity prices: Consumers bearing the high costs of a faulty, deregulated system", Edmonton Journal, Edmonton, Alberta, archived from the original on 1 February 2014

External links

  • Alberta Electric System Operator (AESO) Website