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+# SCI-E (total energy)
+
+`sci-e` is a model that simply sums up the contributions to a component's energy use. The model retunrs `energy` which is used as the input to the `sci-o` model that calculates operational emissions for the component.
+
+## Calculation
+
+`energy` is calculated as the sum of the energy due to CPU usage, energy due to network trafic, energy due to memory and energy due to GPU usage.
+
+```
+energy = e-cpu + e-net + e-mem + e-gpu
+```
+
+In any model pipeline that includes `sci-o`, `sci-o` must be preceded by `sci-e`. This is because `sci-o` does not recognize the individual contributions, `e-cpu`, `e-net`, etc, but expects to find `energy`. Only `sci-e` takes individual contributions and returns `energy`.
+
+## Implementation
+
+To run the model, you must first create an instance of `SciEModel` and call its `configure()` method. Then, you can call `calculate()` to return `energy`.
+
+```typescript
+import { SciEModel } from '@gsf/ief';
+
+const sciEModel = new SciEModel();
+sciEModel.configure()
+const results = sciEModel.calculate([
+  {
+    e-cpu: 0.001,
+    e-mem: 0.0005,
+    e-net: 0.0005,
+  }
+])
+```
+
+## Example impl
+
+IEF users will typically call the model as part of a pipeline defined in an `impl` file. In this case, instantiating and configuring the model is handled by `rimpl` and does not have to be done explicitly by the user. The following is an example `impl` that calls `sci-e`:
+
+```yaml
+name: sci-e-demo
+description:
+tags:
+initialize:
+  models:
+    - name: sci-e
+      kind: builtin
+graph:
+  children:
+    child:
+      pipeline:
+        - sci-e
+      config:
+        sci-e:
+      observations:
+        - timestamp: 2023-08-06T00:00
+          duration: 3600
+          e-cpu: 0.001
+
+```
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+name: sci-e-demo
+description:
+tags:
+initialize:
+  models:
+    - name: sci-e
+      kind: builtin
+graph:
+  children:
+    child:
+      pipeline:
+        - sci-e
+      config:
+        sci-e:
+      observations:
+        - timestamp: 2023-08-06T00:00
+          duration: 3600
+          e-cpu: 0.001
+  
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