Power Exchanges

A power exchange is an organised electronic marketplace where electricity buyers and sellers submit bids and offers. It facilitates market-based price discovery by matching demand with available supply under transparent trading rules, rather than fixing the electricity price administratively or through individual bilateral negotiations.

The market and its regulatory framework

Power exchanges provide a common trading platform for generators, distribution companies, electricity traders and eligible consumers. They organise transactions; physical delivery depends on the transmission network and scheduling by grid operators.

• Section 66 of the Electricity Act, 2003 provides for promoting the development of an electricity market, including trading.
• The Central Electricity Regulatory Commission (CERC) regulates power exchanges under its power-market framework, including rules governing their operation and market oversight.
• Exchange transactions complement bilateral contracts and long-term power purchase agreements rather than replacing all electricity procurement.

How bids become a market price

In the day-ahead auction market, participants submit quantities and prices for specified delivery time blocks. Buyers indicate their willingness to pay, while sellers indicate the prices at which they are willing to supply.

• The exchange aggregates buy bids and sell offers into demand and supply curves, arranging purchase bids from higher to lower prices and sale offers from lower to higher prices.
• The matching process determines the market-clearing price and traded quantity where demand and supply meet, subject to applicable market rules and network constraints.
• Under uniform-price clearing, accepted purchases and sales for the relevant market area and time block are settled at the common clearing price, rather than at each participant's quoted price.
• Limited transmission capacity can constrain trading and produce different prices across market areas; discovered prices therefore reflect network availability as well as demand and supply.
• Transmission charges, losses and other applicable charges mean that a buyer's delivered electricity cost can differ from the exchange clearing price.

Why price discovery matters

Exchange prices reveal the changing value of electricity across delivery periods. Competition and transparent bidding help buyers compare procurement options and sellers find purchasers for available output.

• Higher prices during scarcity encourage additional supply and demand reduction, while lower prices signal relatively abundant electricity.
• Price differences across periods can support storage and demand flexibility, including charging when electricity is cheaper and supplying or reducing consumption when it is dearer.
• Reliable price discovery requires adequate competition, transmission access and regulatory surveillance against market manipulation.