Create EnergyTariffOracle.sol

EnergyTariffOracle.sol

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+/*
+   Energy Price Peg
+
+   This contract keeps in storage a reference
+   to the Energy Price in USD
+*/
+
+
+pragma solidity ^0.4.0;
+import "github.com/oraclize/ethereum-api/oraclizeAPI.sol";
+
+contract EnergyTariff is usingOraclize {
+
+    uint public EnergyTariffUSD;
+
+    event newOraclizeQuery(string description);
+    event newEnergyTariff(string price);
+
+    function EnergyTariff() {
+        update(); // first check at contract creation
+    }
+
+    function __callback(bytes32 myid, string result) {
+        if (msg.sender != oraclize_cbAddress()) throw;
+        newEnergyTariff(result);
+        EnergyTariffUSD = viewInt(result, 2); // let's save it as $ cents
+    }
+
+    function update() payable {
+        newOraclizeQuery("Oraclize query was sent, standing by for the answer..");
+        oraclize_query("URL", "xml(https://www.eia.gov/state/print.php?sid=RQ");
+    }
+
+}