The SFE has listed flat/base options on futures for each of the NEM regions SA1, NSW1, QLD1, VIC1 in the Australian market, see for examplehttp://d-cyphatrade.com.au/market_options#ANfor prices.The options are on calendar year strips of the underlying futures contract, so for example, if you buy one of these options and exercise you will be getting a Q1, Q2, Q3, and Q4 contract (one of each) They did have options on Q1 peak futures contracts but they have recently axed this product.Be careful if you are valuing options on these as the option premium is margined throughout the contract so an Asay like formula (not Black) should be employed.(If anyone has a link to the original Asay paper could they post it, or a link, I have been looking for it for ages).The underlying futures that the options are on are also on the
http://d-cyphatrade.com.au site. If you are after volume info about how much volume there is, have a look around their site (I think in their news section ) as they often do a summary of how much volume has been traded in the last year. The current open interest is also listed on each pricing page.